Anthropic: Claude Opus 4

anthropic/claude-opus-4

Released May 22, 2025Knowledge cutoff Jan 31, 2025200,000 context$15/M input tokens$75/M output tokens

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(opens in new tab)

Anthropic: Claude Opus 4

anthropic/claude-opus-4

Released May 22, 2025Knowledge cutoff Jan 31, 2025200,000 context$15/M input tokens$75/M output tokens

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(opens in new tab)

Sample code and API for Claude Opus 4

OpenRouter normalizes requests and responses across providers for you.

OpenRouter provides an OpenAI-compatible completion API to 300+ models & providers that you can call directly, or using the OpenAI SDK. Additionally, some third-party SDKs are available.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.