## Bug Fixes
- Fixed Astra’s visibility in the bundled model picker and made it the bundled default when no model is explicitly configured. (#42874)
- Updated Astra’s guidance to use asynchronous questions only when the tool is available in the session. (#42878)
## Changelog
Full Changelog: https://github.com/openai/codex/compare/rust-v0.153.3...rust-v0.153.4
- #42874 [0.153 hotfix] Show Astra in bundled model picker @rhan-oai
- #42878 [0.153 hotfix] Qualify Astra async-question guidance by tool availability @rhan-oai