Anthropic: Claude Sonnet 4.5

Claude Sonnet 4.5 is a closed-weights model from Anthropic that accepts text, image, and file inputs and returns up to 64,000 tokens per response. Its one-million-token context window is among the larger options available, making it practical for tasks involving long documents or extended conversations. The model supports tool use and reasoning, which broadens its utility for multi-step or agentic workflows. At $3.00 per million input tokens and $15.00 per million output tokens, it sits in the mid-to-upper tier of API pricing, so cost-sensitive teams should factor output volume carefully. Its blended benchmark score of 70.0 is drawn from only two benchmarks, meaning independent performance evidence is limited and comparisons to more thoroughly evaluated models should be made with caution. It is a reasonable shortlist candidate for developers who need large context, multimodal inputs, and tool support, and who are willing to pay a moderate premium for those combined capabilities.