Add support for OpenAI GPT-5.2 models

[PeterDaveHello]

Description

Add the latest GPT-5.2 series models

Test Procedure

Using the test suites

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

• No documentation updates are required.
• Yes, documentation updates are required.

Document new OpenAI GPT-5.2 family (including Pro/chat-latest/snapshots) and default model change to gpt-5.2.

Additional Notes

References:

• https://openai.com/index/introducing-gpt-5-2/
• https://platform.openai.com/docs/models/gpt-5.2

Get in Touch

@PeterDaveHello

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Important

Add support for OpenAI GPT-5.2 models, update default model, and enhance tests for new features.

• Behavior:
  • Add support for gpt-5.2, gpt-5.2-chat-latest, and gpt-5.2-pro models in openai.ts.
  • Set gpt-5.2 as the new default model in openai.ts.
  • Add dated snapshots gpt-5.2-2025-12-11 and gpt-5.2-pro-2025-12-11 for backward compatibility.
• Tests:
  • Update openai-native-usage.spec.ts to test prompt_cache_retention for gpt-5.2 models.
  • Update openai-native.spec.ts to test model selection and API interactions for gpt-5.2 models.
  • Ensure tests cover new features like verbosity and reasoning effort for gpt-5.2 models.

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[roomote]

Rooviewer   See task on Roo Cloud

Review complete. No issues found.

The PR correctly adds GPT-5.2 model definitions following established patterns, updates the default model, and includes appropriate test coverage for prompt cache retention.

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[hannesrudolph]

having all the models such as gpt-5.2-2025-12-11 makes too much noise. Pro does not work in this provider as it requires some timeout configurations and handling for its extended reasoning loops. I will add chat to mine.