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Anthropic: Claude Opus 4.1

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Match confidence: UnmatchedSource type: model_only
Context window
0
Arena overall rank
—
Input price
$0.000 / 1M
Output price
$0.000 / 1M

Identifiers & provenance

Primary ID
anthropic/claude-opus-4.1
OpenRouter ID
anthropic/claude-opus-4.1
Canonical slug
anthropic/claude-4.1-opus-20250805

Source semantics

  • Arena rank is a human-preference leaderboard signal, not a universal truth metric.
  • OpenRouter usage/popularity reflects adoption/traffic, not benchmark quality.
  • Pricing fields may differ by provider and can include extra modes beyond prompt/completion.

Read more on Methodology & data sources.

Description

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.

Raw fields snapshot

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Anthropic: Claude Opus 4.1 · NNZen