refactor: remove OpenAI deprecated models

[ddanielcruzz]

Deprecated list

• chatgpt-4o-latest https://developers.openai.com/api/docs/deprecations#2025-11-18-chatgpt-4o-latest-snapshot
• codex-mini-latest https://developers.openai.com/api/docs/deprecations#2025-11-17-codex-mini-latest-model-snapshot
• gpt-4-0125-preview, gpt-4-turbo-preview, gpt-4-1106-preview https://developers.openai.com/api/docs/deprecations#2025-09-26-legacy-gpt-model-snapshots
• gpt-4-32k, gpt-4-32k-0613 https://developers.openai.com/api/docs/deprecations#2024-06-06-gpt-4-32k-and-vision-preview-models
• o1-mini, o1-mini-2024-09-12, o1-preview, o1-preview-2024-09-12 https://developers.openai.com/api/docs/deprecations#2025-04-28-o1-preview-and-o1-mini
• gpt-4o-audio-preview-2024-10-01 https://developers.openai.com/api/docs/deprecations#2025-06-10-gpt-4o-audio-preview-2024-10-01

Doesn't exist

• gpt-5.1-mini

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Pre-Review Checklist

• Any AI generated code has been reviewed line-by-line by the human PR author, who stands by it.
• No breaking changes in accordance with the version policy.
• Linting and type checking pass per make format and make typecheck.
• PR title is fit for the release changelog.

Pre-Merge Checklist

• New tests for any fix or new behavior, maintaining 100% coverage.
• Updated documentation for new features and behaviors, including docstrings for API docs.

[devin-ai-integration]

Devin Review found 2 potential issues.

[devin-ai-integration]

🚩 Existing tests and profile code still reference removed o1-mini model

Multiple test files (tests/models/test_openai.py:858-882, tests/profiles/test_openai.py:34, tests/models/test_model.py:278) and profile code (pydantic_ai_slim/pydantic_ai/profiles/openai.py:167-169) still reference o1-mini. This is not a bug because KnownModelName is a type-level hint for autocomplete/IDE support — users can still pass arbitrary model name strings to OpenAIChatModel. The profile special-casing for o1-mini's system prompt role remains useful for anyone passing the string directly. However, the test at tests/profiles/test_openai.py:34 and tests/models/test_model.py:278 might warrant review to determine if they should be updated or removed for consistency with the deprecation intent.

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[devin-ai-integration]

🟡 Inconsistent removal: gateway/openai:o1-mini kept while openai:o1-mini removed

openai:o1-mini was removed as a deprecated model, but its gateway/openai:o1-mini counterpart at line 338 was not. Every other model removed in this PR was consistently removed from both the openai: and gateway/openai: sections (e.g., o1-preview, o1-mini-2024-09-12, o1-preview-2024-09-12, chatgpt-4o-latest, etc.), making this an incomplete transformation.

Suggested change

'gateway/openai:o1-mini',

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[github-actions]

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