o1
O-series reasoning model for hard analysis, math, coding, and planning
ECI STANDING#97 of 266
SCORE141.86140.15–143.11 CI
FRONTIER LAGLaunched in the leadNothing released before it had scored higher.
SCORES LIKE THESE MODELSClaude Haiku 4.5Anthropic · Oct 2025142.37
Full Epoch Capabilities Index ranking ↗Gemma 4 26B A4BGoogle DeepMind · Apr 2026141.86
Claude Sonnet 4Anthropic · May 2025141.69Gemini 2.5 Flash (May 2025)Google DeepMind · May 2025141.54
From the lab
Launch announcement · Sep 12, 2024Introducing OpenAI o1Related article · Dec 17, 2024OpenAI o1 and new tools for developersRELEASE DATESep 12, 2024
WEIGHTSClosed weights
CONTEXT WINDOW200K
MAX OUTPUT100K
REASONINGYes
TOOL CALLINGYes
INPUTStext, image, pdf
OUTPUTStext
Specifications from Models.dev. Availability and limits may differ by provider. Benchmark scores come from Epoch AI under CC BY 4.0.