What changed
Codex CLI 0.153.1 (September 3) let you configure GPT-6 Astra through the API without changing your default. Version 0.153.4 (September 4) fixed Astra missing from the bundled model picker and made it the default when no model is set. Version 0.154.0 (September 9) listed Astra in the picker and the Amazon Bedrock catalog and added experimental worktree support with –worktree and /worktree.
Who it affects
Codex CLI users who don’t pin a model in their config.
What to do
Set model in config.toml if you relied on the old default, so an upgrade doesn’t quietly move you to Astra.