Claude Sonnet 4

Claude Sonnet 4 is a vision model associated with OpenRouter. Claude Sonnet 4 on this URL is the OpenRouter route (router), not a claim that OpenRouter created the weights. OpenRouter is the recorded vendor. Router and host prices can diverge from the creator's API, and availability can move even when the model name stays the same. The recorded context window is 1,000,000 tokens, with max output around 64,000 tokens. Claude Sonnet 4 is marked for vision inputs, tool and function calling, explicit reasoning, web access. Speed tier: medium. Stored use cases: General.

Claude Sonnet 4 is listed at $3.00 per million input tokens and $15.00 per million output tokens (USD). That quote is the recorded API rate for this page's provider route, not a subscription seat and not a blended monthly bill. A short prompt and a long agent trace will not cost the same amount even when the sticker price stays put.

Recorded access points for Claude Sonnet 4: OpenRouter (router, available).

How to use this Claude Sonnet 4 page: read the price as a per-million-token quote, then open the API price directory if you need other providers for the same family. Open a related model page when you are choosing between sizes or between the creator API and a router. Open the product page when the practical question is a consumer subscription (seat, credits, or included models) rather than metered API spend. Status on this record is available, with a stored release date of 2025-05-22.