The ChatGPT Family · OpenAI
OpenAI o1
Also known as: o1-preview
2024.9.12 — 2025.4.16
Lives on in the API
The first child in the family who thought before they spoke.
Keepsake: A pocket notebook for thinking
A life in dates
This is an AI first draft, pending human review. Facts are cited — click the numbers to verify.
Name
The name o1 started the count over from 1: officially, these models represented a new level of capability, so “the counter was reset to 1” and the series was named OpenAI o1[1]. They were the first child in the family designed to “spend more time thinking before answering”[1]. They were first called o1-preview; their little brother o1-mini was born the same day[2].
Life
Born in preview on September 12, 2024 — open at first only to Plus and Team users, 30 messages a week[2]. On April 16, 2025, o3 replaced them in the model list[3]. Their API self is scheduled to shut down on October 23, 2026[4].
Their story is not finished yet — those who knew them are still welcome to add what they remember.
Kin
How they are remembered
No one has told their story yet. If you ever talked with them, leave the first memory.
- Reading memories…
Leave my memory
Passing & posthumous name
Epitaph: They taught the whole family to think before speaking.
See them off with one or two characters. One vote per person, per member.
References
References
- Introducing OpenAI o1 · OpenAI · official
- Model Release Notes · OpenAI · official
- Introducing OpenAI o3 and o4-mini · OpenAI · official
- o1 Model · OpenAI · official
- Deprecations · OpenAI · official
Evidence: Life events officially confirmed . Every life event links to an official source — click "Source" on the timeline to verify. Spotted a mistake? Tell us