OpenAI's official deprecation table lists the affected models and 2027 shutdown dates.
OpenAI sets 2027 shutdown dates for Codex and speech API models
2026-10-01Verified announcementWATCH
OpenAI added retirement dates for several pinned API model IDs. GPT-5.3-Codex, GPT-5.4-nano and GPT-5.1 are scheduled to shut down on April 1, 2027. TTS-1, TTS-1-HD and GPT-4o-mini-TTS snapshots are scheduled to shut down on January 6, 2027, with newer GPT-6 and realtime models listed as replacements.
What this means for you
Teams using pinned model IDs now have concrete migration deadlines. Quality, latency, cost and voice regressions need scheduled tests rather than a last-minute alias swap.
Evidence & related material
Technical details & scores
| Coding Models Shutdown | 2027-04-01: gpt-5.3-codex, gpt-5.4-nano and gpt-5.1 |
|---|---|
| Speech Models Shutdown | 2027-01-06: tts-1, tts-1-hd and gpt-4o-mini-tts snapshots |
| Replacement Direction | GPT-6 family and gpt-realtime-2.1-mini as documented |
| Notice | about three to six months depending on model |
Technical impact 2
Engineering value 4
Adoption signal 4
Maturity 5
Verification cost 2
Risk 3