1 AI Catchup article about GPT-5.4, newest first: 1 news story.
OpenAI said GPT-5.4 and GPT-5.4 mini would stop being available in Codex for users signed in with ChatGPT on August 31, 2026, and that date has now passed. The models remain available through the OpenAI API and Codex sessions authenticated with an API key, confirmed September 1, 2026. Recommended replacements: GPT-5.6 Terra and GPT-5.6 Luna.
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