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GPT-5.4 and GPT-5.4 mini retire from Codex on August 31

OpenAI ChatGPT & Codex Changelog · article · Jul 31, 2026 · UTC

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-5.4 with gpt-5.6-terra (GPT-5.6 Terra). - Replace gpt-5.4-mini with gpt-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.

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