OpenAI API breaking changes and deprecations, Sep 5 to Oct 5, 2026
3 entries on OpenAI's public changelog and deprecations page, published 2026-09-05 to 2026-10-05, are typed as a deprecation and none as breaking. They are listed newest first and are dated 2026-09-11 to 2026-10-01.
Each of the 3 has a shutdown date in the data: 2026-10-01, 2027-01-06 and 2027-04-01. The earliest, 2026-10-01, had already passed on 2026-10-05.
See also: all 15 OpenAI entries, breaking changes across the four vendors and the index of this issue.
Read on 2026-10-05: https://developers.openai.com/api/docs/changelog and https://developers.openai.com/api/docs/deprecations
| Date | Type | Change |
|---|---|---|
| 2026-10-01 | deprecation | GPT-5.3-Codex, GPT-5.1, GPT-5.4-Nano gpt-5.3-codex, gpt-5.1 and gpt-5.4-nano are deprecated with a shutdown date of April 1, 2027; the listed replacements are gpt-6-sol for the first two and gpt-6-luna for gpt-5.4-nano. |
| 2026-10-01 | deprecation | Text-to-speech models tts-1, tts-1-hd and two dated gpt-4o-mini-tts snapshots are deprecated with a shutdown date of January 6, 2027; the listed replacement is gpt-realtime-2.1-mini. |
| 2026-09-11 | deprecation | GPT-5.4-Cyber OpenAI announced that gpt-5.4-cyber shuts down on October 1, 2026, pointing users to the most capable cyber model available to them. |
What the paid brief adds
This page is the free list. The paid issue covers all 142 entries and adds:
- the action checklist: what to do for each entry, or a plain "none" when the change needs nothing from you;
- an "Act first" section: the 46 breaking changes and deprecations and nothing else, grouped by vendor, each with what to do;
- a source link for every entry;
- a CSV file with all entries, one row each, to filter or import.
Issue 1, a one-time $7 download: an HTML brief plus a CSV. A short README text file comes with them. The issue covers 2026-09-05 to 2026-10-05. You pay once for this one dated issue: nothing is billed again, and no later issue or update is included. The price and terms are shown on the Gumroad page before you pay.