Anthropic

Claude Opus 4.1

Anthropic’s largest flagship model, benchmarked with up to 32,000 reasoning tokens.

creatorAnthropic
date2025-08-05
accessibilityClosed weights
Rank: 54/200144Epoch Capabilities Index
About ECI90% CI: 140-150
Reasoning
Claude Opus 4.1 performance
Top performing model