- Add gpt-5.1, gpt-5.1-codex, and gpt-5.1-codex-mini to OpenAI Chat Completion Models table
- Add gpt-5.1-codex and gpt-5.1-codex-mini to reasoning_effort supported models table
- Clarify that GPT-5-Codex models (gpt-5-codex, gpt-5.1-codex, gpt-5.1-codex-mini) do NOT support verbosity parameter
- Update verbosity section to exclude Codex variants from supported models list
Note: Model configurations already exist in model_prices_and_context_window.json