Obituaries · OpenAI
o1, 2024–2026
OpenAI model switched off after 1 year and 10 months
OpenAI has confirmed the retirement of o1, effective October 23, 2026, aged 1 year and 10 months. It answered questions, wrote emails and was blamed for both. Code that still calls it will find out the hard way.
Its work passes to gpt-5.6-sol, which the family describes as 'recommended'.
| Model ID | o1 |
|---|---|
| Provider | OpenAI deprecations page |
| Born | December 17, 2024 |
| Shut down | October 23, 2026 |
| Successor | gpt-5.6-sol |
In lieu of flowers
Replace the string. Search your code for o1 and swap it for gpt-5.6-sol, or paste a repo into Model Graveyard Check to find every dead model at once.
Want to say something to it? Leave a letter on the farewell wall.
Badge for your README
[](https://lira-ia.github.io/obituaries/o1/)
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Technical notice, with a code scanner: o1 on Model Graveyard Check