diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 1b5dc400..0a40b9d7 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.39.0"
+  ".": "0.40.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 82ef3004..e44510d0 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 62
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/mixedbread%2Fmixedbread-c53a9b02bf4bd345435a03b4178aed1b7c8ac04a2508f370b5361bf305a3f803.yml
-openapi_spec_hash: f05a6df876280efad08ed2f0ab78d5fc
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/mixedbread%2Fmixedbread-636ffd012f5b88d33c33cd0de8290a01564009f31d8004a87a2d516435c03868.yml
+openapi_spec_hash: 91c662ed12c45e766bc325d47fd6e285
 config_hash: 6fa04d08d4e1a3a45f562e37fab0ea71
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e8f38812..0509a3f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,24 @@
 # Changelog
 
+## 0.40.0 (2025-11-11)
+
+Full Changelog: [v0.39.0...v0.40.0](https://github.com/mixedbread-ai/mixedbread-python/compare/v0.39.0...v0.40.0)
+
+### Features
+
+* **api:** api update ([93c24d4](https://github.com/mixedbread-ai/mixedbread-python/commit/93c24d40549f6e7d1cb881313a40bcdd19fed4ab))
+* **api:** api update ([478b973](https://github.com/mixedbread-ai/mixedbread-python/commit/478b9736d4da0411c814620a61b2675faed9173c))
+
+
+### Bug Fixes
+
+* compat with Python 3.14 ([99a4c1c](https://github.com/mixedbread-ai/mixedbread-python/commit/99a4c1c553bd638b2d7e2f050ca33824623c93e8))
+
+
+### Chores
+
+* **package:** drop Python 3.8 support ([54a77eb](https://github.com/mixedbread-ai/mixedbread-python/commit/54a77eb9af52ced156a07b0d524068cb5337dd8f))
+
 ## 0.39.0 (2025-11-07)
 
 Full Changelog: [v0.38.0...v0.39.0](https://github.com/mixedbread-ai/mixedbread-python/compare/v0.38.0...v0.39.0)
diff --git a/README.md b/README.md
index ade28bb0..fc0e2f30 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 <!-- prettier-ignore -->
 [![PyPI version](https://img.shields.io/pypi/v/mixedbread.svg?label=pypi%20(stable))](https://pypi.org/project/mixedbread/)
 
-The Mixedbread API Python SDK library provides convenient access to the Mixedbread REST API from any Python 3.8+
+The Mixedbread API Python SDK library provides convenient access to the Mixedbread REST API from any Python 3.9+
 application. The library includes type definitions for all request params and response fields,
 and offers both synchronous and asynchronous clients powered by [httpx](https://github.com/encode/httpx).
 
@@ -455,7 +455,7 @@ print(mixedbread.__version__)
 
 ## Requirements
 
-Python 3.8 or higher.
+Python 3.9 or higher.
 
 ## Contributing
 
diff --git a/pyproject.toml b/pyproject.toml
index f2df0f6e..5b3f8eab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "mixedbread"
-version = "0.39.0"
+version = "0.40.0"
 description = "The official Python library for the Mixedbread API"
 dynamic = ["readme"]
 license = "Apache-2.0"
@@ -15,11 +15,10 @@ dependencies = [
     "distro>=1.7.0, <2",
     "sniffio",
 ]
-requires-python = ">= 3.8"
+requires-python = ">= 3.9"
 classifiers = [
   "Typing :: Typed",
   "Intended Audience :: Developers",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
@@ -141,7 +140,7 @@ filterwarnings = [
 # there are a couple of flags that are still disabled by
 # default in strict mode as they are experimental and niche.
 typeCheckingMode = "strict"
-pythonVersion = "3.8"
+pythonVersion = "3.9"
 
 exclude = [
     "_dev",
diff --git a/src/mixedbread/_models.py b/src/mixedbread/_models.py
index 6a3cd1d2..fcec2cf9 100644
--- a/src/mixedbread/_models.py
+++ b/src/mixedbread/_models.py
@@ -2,6 +2,7 @@
 
 import os
 import inspect
+import weakref
 from typing import TYPE_CHECKING, Any, Type, Union, Generic, TypeVar, Callable, Optional, cast
 from datetime import date, datetime
 from typing_extensions import (
@@ -573,6 +574,9 @@ class CachedDiscriminatorType(Protocol):
     __discriminator__: DiscriminatorDetails
 
 
+DISCRIMINATOR_CACHE: weakref.WeakKeyDictionary[type, DiscriminatorDetails] = weakref.WeakKeyDictionary()
+
+
 class DiscriminatorDetails:
     field_name: str
     """The name of the discriminator field in the variant class, e.g.
@@ -615,8 +619,9 @@ def __init__(
 
 
 def _build_discriminated_union_meta(*, union: type, meta_annotations: tuple[Any, ...]) -> DiscriminatorDetails | None:
-    if isinstance(union, CachedDiscriminatorType):
-        return union.__discriminator__
+    cached = DISCRIMINATOR_CACHE.get(union)
+    if cached is not None:
+        return cached
 
     discriminator_field_name: str | None = None
 
@@ -669,7 +674,7 @@ def _build_discriminated_union_meta(*, union: type, meta_annotations: tuple[Any,
         discriminator_field=discriminator_field_name,
         discriminator_alias=discriminator_alias,
     )
-    cast(CachedDiscriminatorType, union).__discriminator__ = details
+    DISCRIMINATOR_CACHE.setdefault(union, details)
     return details
 
 
diff --git a/src/mixedbread/_utils/_sync.py b/src/mixedbread/_utils/_sync.py
index ad7ec71b..f6027c18 100644
--- a/src/mixedbread/_utils/_sync.py
+++ b/src/mixedbread/_utils/_sync.py
@@ -1,10 +1,8 @@
 from __future__ import annotations
 
-import sys
 import asyncio
 import functools
-import contextvars
-from typing import Any, TypeVar, Callable, Awaitable
+from typing import TypeVar, Callable, Awaitable
 from typing_extensions import ParamSpec
 
 import anyio
@@ -15,34 +13,11 @@
 T_ParamSpec = ParamSpec("T_ParamSpec")
 
 
-if sys.version_info >= (3, 9):
-    _asyncio_to_thread = asyncio.to_thread
-else:
-    # backport of https://docs.python.org/3/library/asyncio-task.html#asyncio.to_thread
-    # for Python 3.8 support
-    async def _asyncio_to_thread(
-        func: Callable[T_ParamSpec, T_Retval], /, *args: T_ParamSpec.args, **kwargs: T_ParamSpec.kwargs
-    ) -> Any:
-        """Asynchronously run function *func* in a separate thread.
-
-        Any *args and **kwargs supplied for this function are directly passed
-        to *func*. Also, the current :class:`contextvars.Context` is propagated,
-        allowing context variables from the main thread to be accessed in the
-        separate thread.
-
-        Returns a coroutine that can be awaited to get the eventual result of *func*.
-        """
-        loop = asyncio.events.get_running_loop()
-        ctx = contextvars.copy_context()
-        func_call = functools.partial(ctx.run, func, *args, **kwargs)
-        return await loop.run_in_executor(None, func_call)
-
-
 async def to_thread(
     func: Callable[T_ParamSpec, T_Retval], /, *args: T_ParamSpec.args, **kwargs: T_ParamSpec.kwargs
 ) -> T_Retval:
     if sniffio.current_async_library() == "asyncio":
-        return await _asyncio_to_thread(func, *args, **kwargs)
+        return await asyncio.to_thread(func, *args, **kwargs)
 
     return await anyio.to_thread.run_sync(
         functools.partial(func, *args, **kwargs),
@@ -53,10 +28,7 @@ async def to_thread(
 def asyncify(function: Callable[T_ParamSpec, T_Retval]) -> Callable[T_ParamSpec, Awaitable[T_Retval]]:
     """
     Take a blocking function and create an async one that receives the same
-    positional and keyword arguments. For python version 3.9 and above, it uses
-    asyncio.to_thread to run the function in a separate thread. For python version
-    3.8, it uses locally defined copy of the asyncio.to_thread function which was
-    introduced in python 3.9.
+    positional and keyword arguments.
 
     Usage:
 
diff --git a/src/mixedbread/_version.py b/src/mixedbread/_version.py
index d0ade071..326f9b6c 100644
--- a/src/mixedbread/_version.py
+++ b/src/mixedbread/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "mixedbread"
-__version__ = "0.39.0"  # x-release-please-version
+__version__ = "0.40.0"  # x-release-please-version
diff --git a/src/mixedbread/types/parsing/parsing_job.py b/src/mixedbread/types/parsing/parsing_job.py
index c950c5a4..7eaa134d 100644
--- a/src/mixedbread/types/parsing/parsing_job.py
+++ b/src/mixedbread/types/parsing/parsing_job.py
@@ -34,7 +34,7 @@ class ResultChunkElement(BaseModel):
 
 
 class ResultChunk(BaseModel):
-    content: str
+    content: Optional[str] = None
     """The full content of the chunk"""
 
     content_to_embed: str
diff --git a/src/mixedbread/types/scored_audio_url_input_chunk.py b/src/mixedbread/types/scored_audio_url_input_chunk.py
index 0babf168..107ae57e 100644
--- a/src/mixedbread/types/scored_audio_url_input_chunk.py
+++ b/src/mixedbread/types/scored_audio_url_input_chunk.py
@@ -49,6 +49,10 @@ class GeneratedMetadataMarkdownChunkGeneratedMetadata(BaseModel):
 
     heading_context: Optional[List[GeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -73,6 +77,10 @@ class GeneratedMetadataTextChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -119,6 +127,10 @@ class GeneratedMetadataCodeChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
diff --git a/src/mixedbread/types/scored_image_url_input_chunk.py b/src/mixedbread/types/scored_image_url_input_chunk.py
index c1ea6bfa..fc929eb4 100644
--- a/src/mixedbread/types/scored_image_url_input_chunk.py
+++ b/src/mixedbread/types/scored_image_url_input_chunk.py
@@ -49,6 +49,10 @@ class GeneratedMetadataMarkdownChunkGeneratedMetadata(BaseModel):
 
     heading_context: Optional[List[GeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -73,6 +77,10 @@ class GeneratedMetadataTextChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -119,6 +127,10 @@ class GeneratedMetadataCodeChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
diff --git a/src/mixedbread/types/scored_text_input_chunk.py b/src/mixedbread/types/scored_text_input_chunk.py
index 762a2a1c..2eeddb07 100644
--- a/src/mixedbread/types/scored_text_input_chunk.py
+++ b/src/mixedbread/types/scored_text_input_chunk.py
@@ -48,6 +48,10 @@ class GeneratedMetadataMarkdownChunkGeneratedMetadata(BaseModel):
 
     heading_context: Optional[List[GeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -72,6 +76,10 @@ class GeneratedMetadataTextChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -118,6 +126,10 @@ class GeneratedMetadataCodeChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
diff --git a/src/mixedbread/types/scored_video_url_input_chunk.py b/src/mixedbread/types/scored_video_url_input_chunk.py
index 3329d671..488f80d0 100644
--- a/src/mixedbread/types/scored_video_url_input_chunk.py
+++ b/src/mixedbread/types/scored_video_url_input_chunk.py
@@ -49,6 +49,10 @@ class GeneratedMetadataMarkdownChunkGeneratedMetadata(BaseModel):
 
     heading_context: Optional[List[GeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -73,6 +77,10 @@ class GeneratedMetadataTextChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -119,6 +127,10 @@ class GeneratedMetadataCodeChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
diff --git a/src/mixedbread/types/stores/store_file.py b/src/mixedbread/types/stores/store_file.py
index 58dcef0c..dccbbe40 100644
--- a/src/mixedbread/types/stores/store_file.py
+++ b/src/mixedbread/types/stores/store_file.py
@@ -92,6 +92,10 @@ class ChunkTextInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadata(BaseMod
         List[ChunkTextInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -116,6 +120,10 @@ class ChunkTextInputChunkGeneratedMetadataTextChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -162,6 +170,10 @@ class ChunkTextInputChunkGeneratedMetadataCodeChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -270,6 +282,10 @@ class ChunkImageURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadata(Bas
         List[ChunkImageURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -294,6 +310,10 @@ class ChunkImageURLInputChunkGeneratedMetadataTextChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -340,6 +360,10 @@ class ChunkImageURLInputChunkGeneratedMetadataCodeChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -459,6 +483,10 @@ class ChunkAudioURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadata(Bas
         List[ChunkAudioURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -483,6 +511,10 @@ class ChunkAudioURLInputChunkGeneratedMetadataTextChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -529,6 +561,10 @@ class ChunkAudioURLInputChunkGeneratedMetadataCodeChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -648,6 +684,10 @@ class ChunkVideoURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadata(Bas
         List[ChunkVideoURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -672,6 +712,10 @@ class ChunkVideoURLInputChunkGeneratedMetadataTextChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -718,6 +762,10 @@ class ChunkVideoURLInputChunkGeneratedMetadataCodeChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
diff --git a/src/mixedbread/types/vector_store_question_answering_response.py b/src/mixedbread/types/vector_store_question_answering_response.py
index 29d115f6..6f1d5a9b 100644
--- a/src/mixedbread/types/vector_store_question_answering_response.py
+++ b/src/mixedbread/types/vector_store_question_answering_response.py
@@ -94,6 +94,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredTextInputChunk
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -120,6 +124,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredTextInputChunk
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -170,6 +178,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredTextInputChunk
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -307,6 +319,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredImageURLInputC
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -333,6 +349,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredImageURLInputC
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -383,6 +403,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredImageURLInputC
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -531,6 +555,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredAudioURLInputC
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -557,6 +585,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredAudioURLInputC
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -607,6 +639,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredAudioURLInputC
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -755,6 +791,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredVideoURLInputC
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -781,6 +821,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredVideoURLInputC
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -831,6 +875,10 @@ class SourceMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredVideoURLInputC
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
diff --git a/src/mixedbread/types/vector_store_search_response.py b/src/mixedbread/types/vector_store_search_response.py
index 41f4d77b..dd5c4f2c 100644
--- a/src/mixedbread/types/vector_store_search_response.py
+++ b/src/mixedbread/types/vector_store_search_response.py
@@ -94,6 +94,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredTextInputChunkGe
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -120,6 +124,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredTextInputChunkGe
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -170,6 +178,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredTextInputChunkGe
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -307,6 +319,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredImageURLInputChu
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -333,6 +349,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredImageURLInputChu
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -383,6 +403,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredImageURLInputChu
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -531,6 +555,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredAudioURLInputChu
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -557,6 +585,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredAudioURLInputChu
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -607,6 +639,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredAudioURLInputChu
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -755,6 +791,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredVideoURLInputChu
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -781,6 +821,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredVideoURLInputChu
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -831,6 +875,10 @@ class DataMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredVideoURLInputChu
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
diff --git a/src/mixedbread/types/vector_stores/scored_vector_store_file.py b/src/mixedbread/types/vector_stores/scored_vector_store_file.py
index 85e4721e..55e1ed55 100644
--- a/src/mixedbread/types/vector_stores/scored_vector_store_file.py
+++ b/src/mixedbread/types/vector_stores/scored_vector_store_file.py
@@ -96,6 +96,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredTextInputChunkG
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -122,6 +126,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredTextInputChunkG
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -172,6 +180,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredTextInputChunkG
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -309,6 +321,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredImageURLInputCh
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -335,6 +351,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredImageURLInputCh
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -385,6 +405,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredImageURLInputCh
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -533,6 +557,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredAudioURLInputCh
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -559,6 +587,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredAudioURLInputCh
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -609,6 +641,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredAudioURLInputCh
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -757,6 +793,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredVideoURLInputCh
         ]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -783,6 +823,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredVideoURLInputCh
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -833,6 +877,10 @@ class ChunkMxbaiOmniAPIRoutesV1DeprecatedVectorStoresModelsScoredVideoURLInputCh
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
diff --git a/src/mixedbread/types/vector_stores/vector_store_file.py b/src/mixedbread/types/vector_stores/vector_store_file.py
index 2fc6168d..02f8f31a 100644
--- a/src/mixedbread/types/vector_stores/vector_store_file.py
+++ b/src/mixedbread/types/vector_stores/vector_store_file.py
@@ -86,6 +86,10 @@ class ChunkTextInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadata(BaseMod
         List[ChunkTextInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -110,6 +114,10 @@ class ChunkTextInputChunkGeneratedMetadataTextChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -156,6 +164,10 @@ class ChunkTextInputChunkGeneratedMetadataCodeChunkGeneratedMetadata(BaseModel):
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -264,6 +276,10 @@ class ChunkImageURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadata(Bas
         List[ChunkImageURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -288,6 +304,10 @@ class ChunkImageURLInputChunkGeneratedMetadataTextChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -334,6 +354,10 @@ class ChunkImageURLInputChunkGeneratedMetadataCodeChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -453,6 +477,10 @@ class ChunkAudioURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadata(Bas
         List[ChunkAudioURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -477,6 +505,10 @@ class ChunkAudioURLInputChunkGeneratedMetadataTextChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -523,6 +555,10 @@ class ChunkAudioURLInputChunkGeneratedMetadataCodeChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -642,6 +678,10 @@ class ChunkVideoURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadata(Bas
         List[ChunkVideoURLInputChunkGeneratedMetadataMarkdownChunkGeneratedMetadataHeadingContext]
     ] = None
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -666,6 +706,10 @@ class ChunkVideoURLInputChunkGeneratedMetadataTextChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
@@ -712,6 +756,10 @@ class ChunkVideoURLInputChunkGeneratedMetadataCodeChunkGeneratedMetadata(BaseMod
 
     file_size: int
 
+    start_line: Optional[int] = None
+
+    num_lines: Optional[int] = None
+
     if TYPE_CHECKING:
         # Some versions of Pydantic <2.8.0 have a bug and don’t allow assigning a
         # value to this field, so for compatibility we avoid doing it at runtime.
diff --git a/tests/test_models.py b/tests/test_models.py
index 4a12ab5d..a8c78064 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -9,7 +9,7 @@
 
 from mixedbread._utils import PropertyInfo
 from mixedbread._compat import PYDANTIC_V1, parse_obj, model_dump, model_json
-from mixedbread._models import BaseModel, construct_type
+from mixedbread._models import DISCRIMINATOR_CACHE, BaseModel, construct_type
 
 
 class BasicModel(BaseModel):
@@ -809,7 +809,7 @@ class B(BaseModel):
 
     UnionType = cast(Any, Union[A, B])
 
-    assert not hasattr(UnionType, "__discriminator__")
+    assert not DISCRIMINATOR_CACHE.get(UnionType)
 
     m = construct_type(
         value={"type": "b", "data": "foo"}, type_=cast(Any, Annotated[UnionType, PropertyInfo(discriminator="type")])
@@ -818,7 +818,7 @@ class B(BaseModel):
     assert m.type == "b"
     assert m.data == "foo"  # type: ignore[comparison-overlap]
 
-    discriminator = UnionType.__discriminator__
+    discriminator = DISCRIMINATOR_CACHE.get(UnionType)
     assert discriminator is not None
 
     m = construct_type(
@@ -830,7 +830,7 @@ class B(BaseModel):
 
     # if the discriminator details object stays the same between invocations then
     # we hit the cache
-    assert UnionType.__discriminator__ is discriminator
+    assert DISCRIMINATOR_CACHE.get(UnionType) is discriminator
 
 
 @pytest.mark.skipif(PYDANTIC_V1, reason="TypeAliasType is not supported in Pydantic v1")