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Dashboard Benchmarks Models ECI Data About

Claude Opus 4.1 (27k thinking)

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

Release date
2025-08-05
Developer
Anthropic
Accessibility
Non-open weights
141
Epoch Capabilities Index
RANK:
ECI is a composite metric based on over 42 benchmarks. Learn more.
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