Claude Opus 4.1

Published

Aug 5, 2025

Claude Opus 4.1 is an AI model developed by Anthropic (United States), first published in August 2025. It works in the language, multimodal and vision domain, on tasks such as language modeling/generation, question answering, system control and 5 more.

Epoch AI has no training-compute estimate for this model.

Access: API access. Its weights are not openly released.

Full record

Organization: Anthropic
Country of organization: United States
Domain: Language, Multimodal, Vision
Task: Language modeling/generation, Question answering, System control, Code generation, Search, Quantitative reasoning, Mathematical reasoning, Visual question answering
Model accessibility: API access
Open weights: No

Benchmark results

01

Epoch Capabilities Index

ECI Score

144.2