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Anthropic

Anthropic: Claude Opus 4.1

anthropic/claude-opus-4.1

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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.

Input
$15

/ 1M tokens

Output
$75

/ 1M tokens

Context window
200K

tokens

Limits

Context

200,000

tokens

Max output

32,000

16% of the context window

Model facts

Author

Anthropic

Tokenizer

Claude

Modality

Text + Image + File -> Text

Knowledge cutoff

2025-01-31

Created

Aug 5, 2025

Publication status

Hugging Face: unavailableLicense: not publishedParameter count: not published

Modalities

Input · ImageInput · TextInput · FileOutput · Text

Generation controls

Include reasoningMax tokensReasoningStopTemperatureTool choiceToolsTop kTop p

Capability scores

22.8
Intelligence index

Better than 54% of models compared

Creative tasks

Category performance

SVG
Top 56%

1152 Elo

60.8% win

Games
Top 53%

1173 Elo

58.4% win

UI components
Top 61%

1164 Elo

57.8% win

Data visualization
Top 63%

1166 Elo

56.4% win

Code
Top 57%

1173 Elo

55.8% win

Websites
Top 59%

1178 Elo

55.3% win

3D
Top 57%

1154 Elo

51.9% win

ASCII art
Top 51%

1170 Elo

51.5% win