AI models retired or deprecated this month (October 2026)

33 model IDs have a shutdown date in October 2026. 28 of them are OpenAI's, and they all go off on October 23. If any of these strings live in your config, env vars, eval harness or a hard-coded model picker, now's the time to grep for them. Everything below comes from the providers' own deprecation pages (OpenAI, Anthropic, Google Gemini API, Mistral, Groq, Cohere), read on October 22, 2026. Aliases, dated snapshots and fine-tune bases are listed separately, because each one fails on its own when the date passes. Already shut down this month Model Provider Shutdown Replacement named by the provider gpt-5.4-cyber OpenAI Oct 1 "The most capable cyber model available to you" veo-3.1-generate-preview Google Oct 22 gemini-omni-1.1-flash veo-3.1-fast-generate-preview Google Oct 22 gemini-omni-1.1-flash veo-3.1-lite-generate-preview Google Oct 22 gemini-omni-1.1-flash Shutting down October 23 (OpenAI, 28 IDs) Model Replacement named by OpenAI gpt-3.5-turbo, gpt-3.5-turbo-0125, gpt-3.5-turbo-completions gpt-5.6-terra gpt-4, gpt-4-0613, gpt-4-completions, gpt-4-0613-completions gpt-5.6-sol gpt-4-turbo, gpt-4-turbo-2024-04-09, gpt-4-turbo-completions gpt-5.6-sol gpt-4-1106-preview gpt-5.6-sol gpt-4o-2024-05-13 gpt-5.6-sol gpt-4.1-nano, gpt-4.1-nano-2025-04-14 gpt-5.6-luna o1-2024-12-17 gpt-5.6-sol o1-pro, o1-pro-2025-03-19 gpt-5.6-sol (with reasoning.mode: pro) o3-mini, o3-mini-2025-01-31 gpt-5.6-sol o4-mini, o4-mini-2025-04-16 gpt-5.6-terra gpt-image-1 gpt-image-2.5-sunburst or gpt-image-2.5-flare Fine-tune bases on the same date (OpenAI recommends re-tuning on the listed base): Fine-tune base Recommended base ft-gpt-3.5-turbo, ft-o4-mini-2025-04-16, ft-babbage-002, ft-davinci-002 gpt-5.6-terra ft-gpt-4 gpt-5.6-sol ft-gpt-4.1-nano-2025-04-14 gpt-5.6-luna Shutting down October 31 Model Provider Replacement zai-glm-5-2 Mistral (hosted Z.ai model) Z.ai GLM 5.3 Newly deprecated this month (still working, shutdown later) OpenAI announced two batches in October: Model Deprecated Shutdown Replacement gpt-5.1 Oct 1 Apr 1, 2027 gpt-6-sol gpt-5.3-codex Oct 1 Apr 1, 2027 gpt-6-sol gpt-5.4-nano Oct 1 Apr 1, 2027 gpt-6-luna tts-1, tts-1-hd Oct 1 Jan 6, 2027 gpt-realtime-2.1-mini gpt-4o-mini-tts-2025-03-20, gpt-4o-mini-tts-2025-12-15 Oct 1 Jan 6, 2027 gpt-realtime-2.1-mini gpt-4o-2024-08-06, gpt-4o-2024-11-20 Oct 14 Jan 14, 2027 gpt-6-luna gpt-4o-mini-2024-07-18 Oct 14 Jan 14, 2027 gpt-6-luna gpt-4.1-2025-04-14, gpt-4.1-mini-2025-04-14 Oct 14 Jan 14, 2027 gpt-6-luna Anthropic, Mistral, Groq and Cohere listed no deprecations announced in October. Google's page doesn't show announcement dates, only shutdown dates, so its new entries show up in the "coming up" table instead. Coming up in the next 60 days Date Model Provider Replacement Nov 17 gemini-2.5-flash-preview-tts, gemini-2.5-pro-preview-tts, gemini-3.1-flash-tts-preview Google gemini-3.8-flash-tts or gemini-3.8-flash-lite-tts Nov 17 gemini-3.1-flash-live-preview, gemini-2.5-flash-native-audio-preview-12-2025 Google gemini-3.8-live Nov 30 claude-sonnet-4-5-20250929 Anthropic none named on the page Dec 1 gpt-image-1-mini, gpt-image-1.5 OpenAI gpt-image-2.5-sunburst or gpt-image-2.5-flare Dec 11 gpt-5-2025-08-07, o3-2025-04-16, o3-pro-2025-06-10, gpt-5-pro-2025-10-06 OpenAI gpt-5.6-sol Dec 11 gpt-5-mini-2025-08-07 OpenAI gpt-5.6-terra Dec 11 gpt-5-nano-2025-08-07 OpenAI gpt-5.6-luna What to do with this Grep your repos and secrets manager for the IDs above. Aliases like gpt-4 and o4-mini hide in defaults and test fixtures. A retired model usually returns a 404 or a "model not found" error, not a quality drop, so a weekly smoke test that sends one tiny request per configured model catches it before users do. Put the model name in config, not code. Then a retirement is a one-line change. "Replacement" is the provider's suggestion. Run your own evals before swapping, since prices and output differ. Always check the provider's page before acting: OpenAI (developers.openai.com/api/docs/deprecations), Anthropic (platform.claude.com/docs/en/about-claude/model-deprecations), Google (ai.google.dev/gemini-api/docs/deprecations), Mistral (docs.mistral.ai/models). I put this together from Upstream, a free API that reads these deprecation pages and tells you if a model ID is active, deprecated or retired, with the date and replacement: https://upstream-api.pages.dev