diff --git a/docs/components/costdetails.md b/docs/components/costdetails.md
index ada009c..7e29616 100644
--- a/docs/components/costdetails.md
+++ b/docs/components/costdetails.md
@@ -3,8 +3,8 @@
 
 ## Fields
 
-| Field                            | Type                             | Required                         | Description                      |
-| -------------------------------- | -------------------------------- | -------------------------------- | -------------------------------- |
-| `upstream_inference_cost`        | *OptionalNullable[float]*        | :heavy_minus_sign:               | N/A                              |
-| `upstream_inference_input_cost`  | *float*                          | :heavy_check_mark:               | N/A                              |
-| `upstream_inference_output_cost` | *float*                          | :heavy_check_mark:               | N/A                              |
\ No newline at end of file
+| Field                                    | Type                      | Required           | Description |
+| ---------------------------------------- | ------------------------- | ------------------ | ----------- |
+| `upstream_inference_completions_cost`    | *float*                   | :heavy_check_mark: | N/A         |
+| `upstream_inference_prompt_cost`         | *float*                   | :heavy_check_mark: | N/A         |
+| `upstream_inference_cost`                | *OptionalNullable[float]* | :heavy_minus_sign: | N/A         |
\ No newline at end of file
diff --git a/src/openrouter/components/__init__.py b/src/openrouter/components/__init__.py
index e41de29..24fabfb 100644
--- a/src/openrouter/components/__init__.py
+++ b/src/openrouter/components/__init__.py
@@ -1263,9 +1263,8 @@
         UpdateGuardrailResponseTypedDict,
     )
     from .urlcitation import URLCitation, URLCitationType, URLCitationTypedDict
+    from .costdetails import CostDetails, CostDetailsTypedDict
     from .usage import (
-        CostDetails,
-        CostDetailsTypedDict,
         InputTokensDetails,
         InputTokensDetailsTypedDict,
         OutputTokensDetails,
@@ -3319,8 +3318,8 @@
     "URLCitation": ".urlcitation",
     "URLCitationType": ".urlcitation",
     "URLCitationTypedDict": ".urlcitation",
-    "CostDetails": ".usage",
-    "CostDetailsTypedDict": ".usage",
+    "CostDetails": ".costdetails",
+    "CostDetailsTypedDict": ".costdetails",
     "InputTokensDetails": ".usage",
     "InputTokensDetailsTypedDict": ".usage",
     "OutputTokensDetails": ".usage",
diff --git a/src/openrouter/components/chatusage.py b/src/openrouter/components/chatusage.py
index 12b58ec..c915860 100644
--- a/src/openrouter/components/chatusage.py
+++ b/src/openrouter/components/chatusage.py
@@ -12,6 +12,8 @@
 from typing import Optional
 from typing_extensions import NotRequired, TypedDict
 
+from .costdetails import CostDetails, CostDetailsTypedDict
+
 
 class CompletionTokensDetailsTypedDict(TypedDict):
     r"""Detailed completion token usage"""
@@ -124,6 +126,11 @@ class ChatUsageTypedDict(TypedDict):
     r"""Detailed completion token usage"""
     prompt_tokens_details: NotRequired[Nullable[PromptTokensDetailsTypedDict]]
     r"""Detailed prompt token usage"""
+    cost: NotRequired[Nullable[float]]
+    r"""Cost of the completion"""
+    cost_details: NotRequired[CostDetailsTypedDict]
+    is_byok: NotRequired[bool]
+    r"""Whether a request was made using a Bring Your Own Key configuration"""
 
 
 class ChatUsage(BaseModel):
@@ -144,10 +151,24 @@ class ChatUsage(BaseModel):
     prompt_tokens_details: OptionalNullable[PromptTokensDetails] = UNSET
     r"""Detailed prompt token usage"""
 
+    cost: OptionalNullable[float] = UNSET
+    r"""Cost of the completion"""
+
+    cost_details: Optional[CostDetails] = None
+
+    is_byok: Optional[bool] = None
+    r"""Whether a request was made using a Bring Your Own Key configuration"""
+
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
-        optional_fields = ["completion_tokens_details", "prompt_tokens_details"]
-        nullable_fields = ["completion_tokens_details", "prompt_tokens_details"]
+        optional_fields = [
+            "completion_tokens_details",
+            "prompt_tokens_details",
+            "cost",
+            "cost_details",
+            "is_byok",
+        ]
+        nullable_fields = ["completion_tokens_details", "prompt_tokens_details", "cost"]
         null_default_fields = []
 
         serialized = handler(self)
diff --git a/src/openrouter/components/costdetails.py b/src/openrouter/components/costdetails.py
new file mode 100644
index 0000000..7880cdc
--- /dev/null
+++ b/src/openrouter/components/costdetails.py
@@ -0,0 +1,60 @@
+"""Code generated by Speakeasy (https://speakeasy.com). DO NOT EDIT."""
+
+from __future__ import annotations
+from openrouter.types import (
+    BaseModel,
+    Nullable,
+    OptionalNullable,
+    UNSET,
+    UNSET_SENTINEL,
+)
+from pydantic import model_serializer
+from typing_extensions import NotRequired, TypedDict
+
+
+class CostDetailsTypedDict(TypedDict):
+    r"""Breakdown of upstream inference costs"""
+
+    upstream_inference_completions_cost: float
+    upstream_inference_prompt_cost: float
+    upstream_inference_cost: NotRequired[Nullable[float]]
+
+
+class CostDetails(BaseModel):
+    r"""Breakdown of upstream inference costs"""
+
+    upstream_inference_completions_cost: float
+
+    upstream_inference_prompt_cost: float
+
+    upstream_inference_cost: OptionalNullable[float] = UNSET
+
+    @model_serializer(mode="wrap")
+    def serialize_model(self, handler):
+        optional_fields = ["upstream_inference_cost"]
+        nullable_fields = ["upstream_inference_cost"]
+        null_default_fields = []
+
+        serialized = handler(self)
+
+        m = {}
+
+        for n, f in type(self).model_fields.items():
+            k = f.alias or n
+            val = serialized.get(k)
+            serialized.pop(k, None)
+
+            optional_nullable = k in optional_fields and k in nullable_fields
+            is_set = (
+                self.__pydantic_fields_set__.intersection({n})
+                or k in null_default_fields
+            )  # pylint: disable=no-member
+
+            if val is not None and val != UNSET_SENTINEL:
+                m[k] = val
+            elif val != UNSET_SENTINEL and (
+                not k in optional_fields or (optional_nullable and is_set)
+            ):
+                m[k] = val
+
+        return m