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## Summary Adds the missing `xhigh` reasoning level everywhere it should have been documented, and makes clear it only works with `gpt-5.1-codex-max`. ## Changes * `docs/config.md` * Add `xhigh` to the official list of reasoning levels with a note that `xhigh` is exclusive to Codex Max. * `docs/example-config.md` * Update the example comment adding `xhigh` as a valid option but only for Codex Max. * `docs/faq.md` * Update the model recommendation to `GPT-5.1 Codex Max`. * Mention that users can choose `high` or the newly documented `xhigh` level when using Codex Max.