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o1

o1

also answers to: o1-2024-12-17

2024-12-17still running · lived 1 year, 8 months · plot reserved

The preview had already made the case; this was the model that closed it, reaching the API in December 2024 and turning reasoning from a demonstration into something you could put in production. Every model that thinks before it answers is downstream of it. It stops taking requests on 23 October.

Provider
OpenAI
Cause of death
Superseded
Funeral
2026-10-23

Sources