Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with memory, polished document creation, and confident computer use for web QA and workflow automation.
Modalities
In / Out Price
$3 / $15per 1M
Context
1M
Released
Feb 17, 2026
Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with memory, polished document creation, and confident computer use for web QA and workflow automation.
Claude Sonnet 4.6 costs $3.00/M input tokens and $15.00/M output tokens, with separate rates for Cache Read at $0.30/M tokens, Cache Write at $3.75/M tokens and Cache Write (1h) at $6.00/M tokens.
Claude Sonnet 4.6 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.
Yes. Claude Sonnet 4.6 accepts tools and tool_choice for function calling. It supports response_format for JSON output, without JSON-schema enforcement.
Claude Sonnet 4.6 accepts text, images and files such as PDFs as input and returns text.
Claude Sonnet 4.6 is served by 5 providers on OpenRouter: Google Vertex (US), Anthropic, Amazon Bedrock (US), Claude Platform on AWS and Azure. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.
Claude Sonnet 4.6 was released on February 17, 2026.
