Time to Bail · Boarding pass
Act. You can stay.
These models shut down April 1, 2027. Move to gpt-6-sol or gpt-6-luna first.[1]
Act means: change a setting or plan before the date. You can stay.
OpenAI ends gpt-5.1, gpt-5.3-codex and gpt-5.4-nano on April 1, 2027
OpenAI removes gpt-5.1, gpt-5.3-codex and gpt-5.4-nano from the API on April 1, 2027. gpt-5.1 and gpt-5.3-codex move to gpt-6-sol; gpt-5.4-nano moves to gpt-6-luna.
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Search your code, agents and coding tools for gpt-5.1, gpt-5.3-codex and gpt-5.4-nano.
gpt-5.1 and gpt-5.3-codex go to gpt-6-sol. gpt-5.4-nano goes to gpt-6-luna.
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| Shutdown date | April 1, 2027[1] |
|---|---|
| Replacement | gpt-6-sol replaces gpt-5.1 and gpt-5.3-codex[1] |
| Replacement | gpt-6-luna replaces gpt-5.4-nano[1] |
| Notice OpenAI gave | Six months[1] |
| Announced | October 1, 2026[1] |
| Default snapshot behind gpt-5.1 | gpt-5.1-2025-11-13[2] |
| After shutdown | The model can no longer be accessed[1] |
| Shutdown dates in the API | GET /v1/models lists each model's shutdown_date[1] |
| Apps that call these models | Stop working on April 1, 2027[1] |
Calls that name gpt-5.1, gpt-5.3-codex or gpt-5.4-nano stop working. OpenAI says the model is no longer accessible after the shutdown.
gpt-5.1 and gpt-5.3-codex to gpt-6-sol, and gpt-5.4-nano to gpt-6-luna.GET /v1/models and read each model's shutdown_date.Source: [1] OpenAI API deprecations (OpenAI)
Check it yourself. Every fact above links here.
Time to bail on OpenAI API: gpt-5.1, gpt-5.3-codex, gpt-5.4-nano? Act. You can stay. These models shut down April 1, 2027. Move to gpt-6-sol or gpt-6-luna first.
On our scale this is Act: change a setting or plan before the date. You can stay.
OpenAI removes gpt-5.1, gpt-5.3-codex and gpt-5.4-nano from the API on April 1, 2027. gpt-5.1 and gpt-5.3-codex move to gpt-6-sol; gpt-5.4-nano moves to gpt-6-luna.
Here are the facts we checked:
You can stay on OpenAI API. You have to change a setting or plan before the date.
Leaving is a choice here, not a must.
OpenAI is the main source for this page. OpenAI API has not said more than what is listed here. If a fact is not on this page, we do not know it yet.
Apps that call these models: Stop working on April 1, 2027.
The date to remember is April 1, 2027. Make the change before then.
A few tips:
If the change affects your members or team, send one short email. Say what changes for them and when. Put the most important line first.
If there is a date, send a short reminder a few days before it. Keep a copy of the list you sent it to.
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Arrivals · for builders
People on OpenAI API: gpt-5.1, gpt-5.3-codex, gpt-5.4-nano can stay if they make the change. Some would rather leave. Get the playbook for this change, and list your product here.
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