Model release · curated entry
OpenAI releases o1 and creates the reasoning-model category
Introducing OpenAI o1
- Date
- September 12, 2024
- Category
- Model release
- Organization / Model
- OpenAI
- Evidence
- 1 source · 1 evidence family
o1 preview was trained with reinforcement learning to reason at length before answering. It started reasoning models as a distinct product class.
Curator's note: Cross-checked against OpenAI's official announcement page.
Curated sources · 1
Cite this page
This page is a curated static snapshot and can be cited directly. Preferred format GB/T 7714—2025 (electronic resource [EB/OL]); the other 5 styles open below, together with the machine-readable files.
GB/T 7714—2025 (electronic resource [EB/OL])
AI 纪年. OpenAI 发布 o1，推理模型成为新品类[EB/OL]. (2024-09-12)[2026-11-03]. https://aihist.net/e/o1-2024.html.
APA 7 · American Psychological Association
AI 纪年. (2024, September 12). OpenAI 发布 o1，推理模型成为新品类 [Web page]. https://aihist.net/e/o1-2024.html
MLA 9 · Modern Language Association
"OpenAI 发布 o1，推理模型成为新品类." AI 纪年, 12 Sept. 2024, aihist.net/e/o1-2024.html. Accessed 3 Nov. 2026.
Chicago 17 · notes-bibliography
AI 纪年. "OpenAI 发布 o1，推理模型成为新品类." Published Sept. 12, 2024. Accessed Nov. 3, 2026. https://aihist.net/e/o1-2024.html.
IEEE · citation-reference list
"OpenAI 发布 o1，推理模型成为新品类," AI 纪年, 12 Sept. 2024. [Online]. Available: https://aihist.net/e/o1-2024.html. [Accessed: 3 Nov. 2026].
ACM · author-date variant
AI 纪年. September 12, 2024. OpenAI 发布 o1，推理模型成为新品类. Retrieved November 3, 2026 from https://aihist.net/e/o1-2024.html.
All six styles come from one template and can be compared word for word. [引用日期], Accessed, urldate and Y2 all carry this page's build date, 2026-11-03 — a static page is an immutable snapshot, so substitute the date you actually consulted it. The address in every style is the archive's canonical page: this English page translates the same snapshot, and the work keeps its name, so one record cites both. For one-click copying use the same entry in the timeline, which takes the day you opened it. Expand the other styles before printing.