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## Notes - switch misleading High reasoning effort descriptions from "Maximizes reasoning depth" to "Higher reasoning depth" across models with xhigh reasoning. Affects GPT-5.1 Codex Max and Robin - refresh model list fixtures and chatwidget snapshots to match new copy ## Revision - R2: Change 'Higher' to 'Greater' - R1: Initial ## Testing <img width="583" height="142" alt="image" src="https://github.com/user-attachments/assets/1ddd8971-7841-4cb3-b9ba-91095a7435d2" /> <img width="838" height="142" alt="image" src="https://github.com/user-attachments/assets/79aaedbf-7624-4695-b822-93dea7d6a800" />
codex-core
This crate implements the business logic for Codex. It is designed to be used by the various Codex UIs written in Rust.
Dependencies
Note that codex-core makes some assumptions about certain helper utilities being available in the environment. Currently, this support matrix is:
macOS
Expects /usr/bin/sandbox-exec to be present.
Linux
Expects the binary containing codex-core to run the equivalent of codex sandbox linux (legacy alias: codex debug landlock) when arg0 is codex-linux-sandbox. See the codex-arg0 crate for details.
All Platforms
Expects the binary containing codex-core to simulate the virtual apply_patch CLI when arg1 is --codex-run-as-apply-patch. See the codex-arg0 crate for details.