Claude Opus 4.1
anthropic/claude-4.1-opus-20250805
Claude Opus 4.1 is an Anthropic model that accepts image, text, and file inputs and produces text output. It supports tool use and reasoning, handles contexts up to 200 000 tokens, and is priced at $0.015 per million input tokens and $0.075 per million output tokens. The model was released on 2025-08-05 and its weights are not open source.
- tool use
- structured outputs
- reasoning
At a glance
Specifications
What the API gives you
- Context window
- 200K tokens
- Max output
- 32K tokens
- Input price
- $15 / 1M tokens
- Output price
- $75 / 1M tokens
- Cache read
- $1.50 / 1M tokens
- Modalities
- image, text, file → text
- Knowledge cutoff
- Jan 31, 2025
- Released
- Aug 5, 2025
Recommendation coverage
Where this model appears
Not currently included in a published recommendation. This means the available task-specific evidence did not support a ranking yet—not that the model was reviewed and rejected.
Measured evidence
Public benchmark record
- LMArena Text
- 1417 Elo2026-07-16
- LMArena WebDev
- 1386 Elo2026-07-16
- LMArena WebDev
- 1386 Elo2026-07-20
- SWE-bench Verified†
- 76.4%2025-08-19
LMArena data licensed CC-BY-4.0. Aider (Apache-2.0) and SWE-bench (MIT) are open. † Self-reported scaffold plus model result. Treat it as a claim, not an independent measurement.
Catalog data via OpenRouter and models.dev. Last checked within the past 6 hours.