Breaking model

Old GPT-3.5/4/o-series snapshots shut down October 23, 2026, including the bare aliases gpt-4, gpt-3.5-turbo, o1, o3-mini, o4-mini

Takes effect Oct 23, 2026 · gpt-3.5-turbo, gpt-4, gpt-4-turbo, gpt-4.1-nano, o1, o1-pro, o3-mini, o4-mini, gpt-image-1 and fine-tunes

Reviewed against the vendor source on Sep 24, 2026 (AI-assisted review). Key facts are re-checked against the source daily.

What changes

Announced April 22, 2026. Includes the unversioned aliases, so code that never pinned a snapshot still breaks. Covered — gpt-3.5-turbo(-0125), gpt-4(-0613), gpt-4-turbo(-2024-04-09), gpt-4.1-nano(-2025-04-14), gpt-4o-2024-05-13, gpt-image-1, o1(-2024-12-17), o1-pro(-2025-03-19), o3-mini(-2025-01-31), o4-mini(-2025-04-16), plus -completions variants, ft-o4-mini-2025-04-16, and the fine-tuned models ft-gpt-3.5-turbo, ft-gpt-4, ft-gpt-4.1-nano-2025-04-14, ft-babbage-002 and ft-davinci-002. Substitutes are gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna, and gpt-image-2.

Breaking: Calls fail after this date.

What to do

Switch to the listed substitute. Fine-tuned models listed here shut down on the same date, and OpenAI restricts creating new fine-tuning jobs, so confirm you can re-train before planning on it. Check config files and env vars too, where bare aliases like "gpt-4" tend to live.

Strings to search for

gpt-4o1gpt-3.5-turbogpt-4-0613gpt-4-turbogpt-4.1-nanogpt-4o-2024-05-13gpt-image-1o1-2024-12-17o1-proo3-minio4-minift:gpt-3.5-turboft:gpt-4ft:babbage-002ft:davinci-002

Not affected (matches inside these are ignored): gpt-3.5-turbo-1106, gpt-3.5-turbo-instruct, gpt-image-1-mini, gpt-4-0314, gpt-4-0125-preview, gpt-4-1106-preview, gpt-4-turbo-preview, o4-mini-deep-research

Source

https://developers.openai.com/api/docs/deprecations