とりあえず、model_reasoning_effort は high にしておく。

# ~/.codex/config.toml
model_reasoning_effort = "high"

Rust実装

codexはRustで書き直されていた。

  • Zero-dependency Install — currently Node v22+ is required, which is frustrating or a blocker for some users
  • Native Security Bindings — surprise! we already ship a Rust for linux sandboxing since the bindings were available
  • Optimized Performance — no runtime garbage collection, resulting in lower memory consumption
  • Extensible Protocol — we’ve been working on a “wire protocol” for Codex CLI to allow developers to extend the agent in different languages (including Type/JavaScript, Python, etc) and MCPs (already supported in Rust)