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Dashboard Benchmarks Models ECI Data About

o3

OpenAI’s second generation o-series reasoning model, evaluated with high reasoning effort.

Release date
2025-04-16
Developer
OpenAI
Accessibility
Non-open weights
147
Epoch Capabilities Index
RANK:
90% CI: 144 - 149
ECI is a composite metric based on over 43 benchmarks. Learn more.
Reasoning
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