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Written by AI from the official notes. Check them for exact details.GPT-5.4 and GPT-5.4 mini will be retired from Codex on August 31, 2026.
- GPT-5.4 and GPT-5.4 mini retire from Codex on August 31, 2026.
- Users should switch to GPT-5.6 Terra and GPT-5.6 Luna.
- Update workspace defaults and settings before the cutoff.
Why it matters: Users of Codex should prepare to transition to new models to avoid disruptions.
Full release notes2 changes
On August 31, 2026, GPT-5.4 and GPT-5.4 mini will no longer be available in Codex for users signed in with ChatGPT. GPT-5.4 and GPT-5.4 mini will remain available on the OpenAI API and Codex sessions authenticated with an API key.
Switch to their recommended replacements:
- Replace
gpt-5.4withgpt-5.6-terra(GPT-5.6 Terra). - Replace
gpt-5.4-miniwithgpt-5.6-luna(GPT-5.6 Luna).
Before the cutoff, update workspace defaults, saved model settings, managed configurations, custom agents, and scheduled tasks that use either model.
See Codex models and workspace model availability for details.