o1
Deprecated · Language, Multimodal, Reasoning · Primary source available
- Lifecycle
- Milestone or variant
- Related model
- Source event
- AI Radar coverage
- Only month or year known
- 11 events
2024
2025
2026
As of 10 October 2026
Announced +3
Released +2
Deprecated
Released in the API as o1-2024-12-17 (usage tier 5) +1
Successor o3
All events, in order
- Lifecycle Announced
- Lineage Predecessor o1-preview
- Source Blog post published
- Source Announcement published
- Lifecycle Released
- Milestone o1 pro mode released
- Source Announcement published
- Milestone Released in the API as o1-2024-12-17 (usage tier 5)
- Source Announcement published
- Lineage Successor o3
- Lifecycle Deprecated