• Update default model from GPT-5.4 to GPT-5.5
• Align configuration with latest OpenAI model
• Update installation documentation for new model

Update default model configuration

• Updated default model from gpt-5.4-2026-03-05 to gpt-5.5-2026-04-23
• Maintains fallback model as gpt-5.4-mini

pr_agent/settings/configuration.toml

Update installation documentation

• Updated OpenAI API key requirement from GPT-5.4 to GPT-5.5
• Maintains requirement for gpt-5.4-mini access

docs/docs/installation/locally.md

Description

After switching the default model to gpt-5.5-2026-04-23, the commented example settings for
model_reasoning/model_weak still reference gpt-5.4 variants, which can lead users to unintentionally
pin older models when they uncomment the examples.

Code

pr_agent/settings/configuration.toml[R7-10]

+model="gpt-5.5-2026-04-23"
fallback_models=["gpt-5.4-mini"]
#model_reasoning="gpt-5.4-mini" # dedicated reasoning model for self-reflection
#model_weak="gpt-5.4-nano" # optional, a weaker model to use for some easier tasks

Evidence

The default model is now a GPT-5.5 version, while the example commented model_reasoning/model_weak
entries remain GPT-5.4-based, creating a mismatch between the new default family and the suggested
example overrides. The local installation doc was updated to require GPT-5.5 access, reinforcing
that the default expectation has shifted.

pr_agent/settings/configuration.toml[7-10]
docs/docs/installation/locally.md[1-4]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

### Issue description
The default model was updated to GPT-5.5, but the commented example config lines for `model_reasoning` and `model_weak` still reference GPT-5.4 models, which can confuse users and cause accidental pinning to older models.

### Issue Context
`pr_agent/settings/configuration.toml` is used as the defaults/template config; users often uncomment the example lines rather than choosing models from scratch.

### Fix Focus Areas
- pr_agent/settings/configuration.toml[7-10]

### Suggested change
Update the commented example model names to align with the new default model family (GPT-5.5), or otherwise explicitly note they are examples and may be older than the default.

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