anthropic/claude-opus-4.1Claude Opus 4.1 is Anthropic’s proprietary AI model, released Aug 5, 2025. It scores 144 on the Epoch Capabilities Index, costs $15/M input and $75/M output tokens, and handles a 200K-token context window.
Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks.
Scores on standardized evaluations. Higher is better — and rank shows where Claude Opus 4.1 lands among all models tracked on Model Beat.
Graduate-level scientific reasoning
Frontier of human expert knowledge
Common-sense trick questions
Factual accuracy & hallucination
Novel ML problem-solving
Real GitHub issue resolution
Human-rated web development
Olympiad-qualifier math
Research-level math problems
Hardest research math
Economically valuable work
Autonomous task length
Command-line agentic tasks
Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks.
Claude Opus 4.1 is an AI model developed by Anthropic, part of the Claude family, released Aug 5, 2025.
Claude Opus 4.1 is served from $15 per million input tokens and $75 per million output tokens (cheapest credible provider on OpenRouter: Anthropic).
Claude Opus 4.1 supports a context window of up to 200K tokens.
On standardized evaluations tracked by Epoch AI, Claude Opus 4.1 scores 60.0% on SimpleBench, 34.8% on SimpleQA Verified, 1389 on WebDev Arena.
Claude Opus 4.1 is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.
Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Oct 19, 2026.