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Dashboard Benchmarks Models ECI Data About

Claude Opus 4.1

Anthropic’s largest flagship model, benchmarked with up to 27,000 reasoning tokens.

Release date
2025-08-05
Developer
Anthropic
Accessibility
Non-open weights
144
Epoch Capabilities Index
RANK:
90% CI: 141 - 146
ECI is a composite metric based on over 43 benchmarks. Learn more.
Reasoning
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