Codex CLI uses OPENAI_API_KEY instead of logged-in session

What version of Codex is running?

codex-cli 0.23.0

Which model were you using?

gpt5

What platform is your computer?

Linux 6.8.0-52-generic x86_64 x86_64

What steps can reproduce the bug?

1. Log in with codex login successfully.
2. Run a Codex CLI command (e.g., codex run ...).
3. Notice that the CLI attempts to use OPENAI_API_KEY from the environment instead of the logged-in session.

What is the expected behavior?

Codex CLI should use the logged-in session token when a user is authenticated via codex login, even if an OPENAI_API_KEY is set.

What do you see instead?

Codex ignores the login session and tries to use OPENAI_API_KEY, which may cause authentication errors or unexpected behavior.

Additional information

_No response_