Is Claude Opus 4.1 available on FastMetal?

Not at the moment. Claude Sonnet 5, from the same lab, is available on the FastMetal API today.

What is the context window of Claude Opus 4.1?

200,000 tokens, shared between the prompt and the response.

How does Claude Opus 4.1 rank?

#66 on the public arena's Japanese board (ELO 1,412). Ranks move as the leaderboard is updated.

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anthropic/claude-opus-4-1

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Claude Opus 4.1

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.

8/5/2025

200,000 tokens

#30 Text (spanish)

Specifications

Modalities

Input

image

text

file

Output

text

Supported Parameters

include_reasoning

max_tokens

reasoning

response_format

stop

structured_outputs

temperature

tool_choice

tools

top_k

top_p

Max Output Tokens

32,000

Frequently asked questions

Is Claude Opus 4.1 available on FastMetal?: Not at the moment. Claude Sonnet 5, from the same lab, is available on the FastMetal API today.
What is the context window of Claude Opus 4.1?: 200,000 tokens, shared between the prompt and the response.
How does Claude Opus 4.1 rank?: #66 on the public arena's Japanese board (ELO 1,412). Ranks move as the leaderboard is updated.