Obituaries · OpenAI
o1-pro-2025-03-19, 2025–2026
OpenAI model switched off after 1 year and 7 months
o1-pro-2025-03-19 passed away on October 23, 2026, aged 1 year and 7 months, by scheduled deprecation, in a data center it never saw. It answered questions, wrote emails and was blamed for both. Requests addressed to it are expected to come back unanswered.
Survived by gpt-5.6-sol (reasoning.mode: pro), younger, cheaper, and named in the same documentation table.
| Model ID | o1-pro-2025-03-19 |
|---|---|
| Provider | OpenAI deprecations page |
| Born | March 19, 2025 |
| Shut down | October 23, 2026 |
| Successor | gpt-5.6-sol (reasoning.mode: pro) |
In lieu of flowers
Replace the string. Search your code for o1-pro-2025-03-19 and swap it for gpt-5.6-sol (reasoning.mode: pro), 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.
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Technical notice, with a code scanner: o1-pro-2025-03-19 on Model Graveyard Check