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    Anthropic: Claude Opus 4.1

    anthropic/claude-opus-4.1

    Created Aug 5, 2025200,000 context
    $15/M input tokens$75/M output tokens

    Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains in multi-file code refactoring, debugging precision, and detail-oriented reasoning. The model supports extended thinking up to 64K tokens and is optimized for tasks involving research, data analysis, and tool-assisted reasoning.

    Recent activity on Claude Opus 4.1

    Total usage per day on OpenRouter

    Prompt
    182M
    Completion
    5.01M
    Reasoning
    134K

    Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.