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## Summary - update documentation, example configs, and automation defaults to reference gpt-5.1 / gpt-5.1-codex - bump the CLI and core configuration defaults, model presets, and error messaging to the new models while keeping the model-family/tool coverage for legacy slugs - refresh tests, fixtures, and TUI snapshots so they expect the upgraded defaults ## Testing - `cargo test -p codex-core config::tests::test_precedence_fixture_with_gpt5_profile` ------ [Codex Task](https://chatgpt.com/codex/tasks/task_i_6916c5b3c2b08321ace04ee38604fc6b)
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.