Codex CLI 0.153.3/0.153.4: GPT-6-Astra on Amazon Bedrock, bundled-default fix
OpenAI
Following Thursday's default-model switch, Codex CLI 0.153.3 (Sep 4) adds GPT-6-Astra to the Amazon Bedrock model picker for Mantle and Runtime global/US routes and corrects its async clarification-question guidance; 0.153.4 (Sep 4) fixes Astra's visibility in the bundled model picker so it reliably becomes the default when no model is explicitly configured.
Why it matters
completes the Astra rollout across Codex surfaces and enterprise Bedrock routes
Importance: 2/5
follow-up patches to the default-model switch covered on Sep 5; Bedrock route is new
Sources
official
Codex CLI 0.153.4
official
Codex changelog (2026-09-04 entries)