o3-pro

High-effort o3 tier for difficult technical reasoning and careful answers

ECI STANDING#57 of 266
SCORE147.45145.85–149.7 CI
FRONTIER LAGLaunched in the leadNothing released before it had scored higher.
Full Epoch Capabilities Index ranking
RELEASE DATEJun 10, 2025
WEIGHTSClosed weights
CONTEXT WINDOW200K
MAX OUTPUT100K
REASONINGYes
TOOL CALLINGYes
INPUTStext, image
OUTPUTStext

Specifications from Models.dev. Availability and limits may differ by provider. Benchmark scores come from Epoch AI under CC BY 4.0.