Anthropic: Claude Opus Latest

This model always redirects to the latest model in the Claude Opus family.

The Claude Opus Latest documentation on OpenRouter includes the Claude 5.5 Migration Guide cookbook. The quickstart covers API keys and your first request, and the API reference lists every parameter.

Claude Opus Latest has no fixed price of its own. Each request is billed at the price of the model that serves it, so your cost depends on which model the request is routed to.

Claude Opus Latest can route to models with context windows of up to 1,000,000 tokens. The context length available to a request is that of the model that serves it.

Claude Opus Latest accepts text, images, and files such as PDFs as input and returns text.

Claude Fable 5.2, Claude Haiku 5.5, Claude Sonnet 5.5 and 12 more are other text models from Anthropic.

Claude Opus Latest was released on April 21, 2026.