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Claude Opus 4
Claude Opus 4 is benchmarked as the world’s best coding model, at time of release, bringing sustained performance on complex, long-running tasks and agent workflows. It sets new benchmarks in software engineering, achieving leading results on SWE-bench (72.5%) and Terminal-bench (43.2%). Opus 4 supports extended, agentic workflows, handling thousands of task steps continuously for hours without degradation. Read more at the [blog post here](https://www.anthropic.com/news/claude-4)
5/22/2025
200,000 tokens
Specifications
Modalities
Input
image
text
file
Output
text
Supported Parameters
include_reasoning
max_tokens
reasoning
stop
temperature
tool_choice
tools
top_k
top_p
Max Output Tokens
32,000Data policy
- Prompt retention
- Unknown — we could not confirm
- Training
- Unknown — not declared
"Unknown" does not mean "safe". It means we could not confirm it.
Whether a provider trains on prompts is a declared value from our terms with them. Retention is determined from the upstream listing for every host this model can reach. Neither is guessed.
Frequently asked questions
- Is Claude Opus 4 available on FastMetal?
- Not at the moment. Claude Opus 5.5, from the same lab, is available on the FastMetal API today.
- What is the context window of Claude Opus 4?
- 200,000 tokens, shared between the prompt and the response.