gpt-5.1-codex — Retired or GA — shutdown July 23, 2026 or 2027-05-15 — sources disagree
For gpt-5.1-codex, provider is OpenAI; lifecycle status is disputed: Retired per developers.openai.com, GA per learn.microsoft.com; deprecation announced is April 22, 2026; shutdown / retirement date is disputed: July 23, 2026 per developers.openai.com, 2027-05-15 per learn.microsoft.com; recommended replacement is gpt-5.6-sol, recorded from its source on 2026-08-28; source re-checked 2026-11-11.
- Provider
- OpenAI our reading
- Microsoft Azure / Foundry per learn.microsoft.com
- Model ID / API name
- gpt-5.1-codex verified
- Lifecycle status
- Retired sources disagree
- Deprecation announced
- April 22, 2026 verified
- Shutdown / retirement date
- July 23, 2026 sources disagree
- Recommended replacement
- gpt-5.6-sol verified
- Human-readable model name
- gpt-5.1-codex per learn.microsoft.com
- Platform / deployment scope
- Azure / Microsoft Foundry per learn.microsoft.com
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
| July 23, 2026 | `gpt-5.1-codex` | `gpt-5.6-sol` |
— developers.openai.com, retrieved 2026-08-28
Where each value comes from
The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.
Deprecation announced
On April 22, 2026, we announced the deprecation of the following older OpenAI models. Access to these models was shut down on July 23, 2026.
— all from developers.openai.com, retrieved 2026-08-28
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
Lifecycle status
developers.openai.com says lifecycle status is Retired, as of 2026-08-28.
| July 23, 2026 | `gpt-5.1-codex` | `gpt-5.6-sol` |
https://developers.openai.com/api/docs/deprecations.md
learn.microsoft.com says lifecycle status is GA, as of 2026-08-28.
| gpt-5.1-codex | 2025-11-13 | GA | 2027-05-15 | — |
https://learn.microsoft.com/en-us/azure/foundry/openai/concepts/model-retirement-schedule
Shutdown / retirement date
developers.openai.com says shutdown / retirement date is July 23, 2026, as of 2026-08-28.
| July 23, 2026 | `gpt-5.1-codex` | `gpt-5.6-sol` |
https://developers.openai.com/api/docs/deprecations.md
learn.microsoft.com says shutdown / retirement date is 2027-05-15, as of 2026-08-28.
| gpt-5.1-codex | 2025-11-13 | GA | 2027-05-15 | — |
https://learn.microsoft.com/en-us/azure/foundry/openai/concepts/model-retirement-schedule
Where the other sources' values come from
These values were taken from a passage elsewhere on the other source's page, not from the row quoted with it above.
Shutdown / retirement date
| Model | Version | Lifecycle | Retirement date | Replacement | | --- | --- | --- | --- | --- | | codex-mini | 2025-05-16 | Deprecated | 2026-11-15 | — | | gpt-4.1 | 2025-04-14 | Deprecated | 2027-04-14 | — | | gpt-4.1-mini | 2025-04-14 | Deprecated | 2027-04-14 | — | | gpt-4.1-nano | 2025-04-14 | Deprecated | 2027-04-14 | — | | gpt-4o | 2024-05-13 | Deprecated | 2026-12-09 | gpt-5.6-sol | | gpt-4o | 2024-08-06 | Deprecated | 2027-04-14 | gpt-5.1 | | gpt-4o | 2024-11-20 | Legacy | 2027-04-14 | gpt-5.1 | | gpt-4o-mini | 2024-07-18 | Deprecated | 2027-04-14 | — | | gpt-4o-mini-transcribe | 2025-03-20 | GA | 2026-10-15 | — | | gpt-4o-mini-transcribe | 2025-12-15 | GA | 2027-06-15 | — | | gpt-4o-mini-tts | 2025-03-20 | Preview | 2026-10-15 | — | | gpt-4o-mini-tts | 2025-12-15 | GA | 2027-06-15 | — | | gpt-4o-transcribe | 2025-03-20 | GA | 2026-10-15 | — | | gpt-4o-transcribe-diarize | 2025-10-15 | GA | 2027-04-15 | — | | gpt-5 | 2025-08-07 | GA | 2027-02-09 | — | | gpt-5-chat | 2025-08-07 | Retired | 2026-06-29 | gpt-chat-latest | | gpt-5-chat | 2025-10-03 | Retired | 2026-05-13 | gpt-chat-latest | | gpt-5-codex | 2025-09-15 | GA | 2027-03-17 | — | | gpt-5-mini | 2025-08-07 | GA | 2027-02-09 | — | | gpt-5-nano | 2025-08-07 | GA | 2027-02-09 | — | | gpt-5-pro | 2025-10-06 | GA | 2027-04-07 | — | | gpt-5.1 | 2025-11-13 | GA | 2027-05-15 | — | | gpt-5.1-chat | 2025-11-13 | Retired | 2026-06-29 | gpt-chat-latest | | gpt-5.1-codex | 2025-11-13 | GA | 2027-05-15 | — |
— learn.microsoft.com, retrieved 2026-08-28
Sources
- developers.openai.comhttps://developers.openai.com/api/docs/deprecations.md
- platform.openai.comhttps://platform.openai.com/docs/deprecations
- learn.microsoft.comhttps://learn.microsoft.com/en-us/azure/foundry/openai/concepts/model-retirement-schedule