Claude Sonnet 4.6 is a large language model (LLM) created by Anthropic. Released on February 17, 2026, it's the latest iteration of the Sonnet model, offering upgrades in coding, computer use, long-context reasoning, agent planning, knowledge work, and design. It is designed for teams seeking frontier performance in coding, agent development, and professional tasks at scale.
Sonnet 4.6 stands out with its 1 million token context window (in beta), allowing it to process large amounts of information in a single session, such as entire codebases or extensive documents. It approaches the intelligence of Anthropic's Opus 4.6 model but at a lower cost, making it suitable for a wider range of tasks. It is particularly useful for tasks like large document analysis, full codebase reasoning, spreadsheet automation, and business planning simulations. Sonnet 4.6 is the default model for free and Pro tier users across various Claude interfaces.
Sonnet 4.6 is available on all Claude plans, the Claude Developer Platform, and major cloud platforms like Amazon Bedrock, Google Cloud's Vertex AI, and Microsoft Foundry. Pricing starts at $3 per million input tokens and $15 per million output tokens. Prompt caching can offer up to 90% cost savings, and batch processing can save up to 50%.
