Minimum Rust / Cargo Version (MSRV)

What is the type of issue?

_No response_

What is the issue?

I’m trying to build Codex CLI from source. Before proceeding, I want to confirm:

• What is the minimum supported version of Rust (rustc) and Cargo required for successful builds?
• Is there a documented “MSRV” for this project (in README, Cargo.toml, CI configs, etc.)?

Where did you find it?

_No response_