Anthropic has released Claude Sonnet 4.6 to the public today. Claude"s mid-tier model brings improvements across coding, computer use, and long-context reasoning compared to its predecessor.
Claude Sonnet 4.6 is now the default option on Free and Pro plans. Users can access it on Claude"s official website, the Desktop client, and Cowork, while developers can access the API on the Claude Developer platform. The API pricing remains the same as with Sonnet 4.5 at $3 per 1 million input tokens and $15 per 1 million output tokens.
One of the highlights of this release is the increased context window in Claude Sonnet 4.6, which is now at 1 million tokens. This is a massive jump compared to Sonnet 4.5"s 200k token window, as it now allows users to analyze dozens of research papers or entire codebases inside a single conversation. However, this is only available in beta for now, which means regular subscribers still don"t have access to longer conversations. If you want to use Claude Sonnet with an extended context window, you"ll have to do it through the API.
Anthropic is heavily investing in tools that allow users to give control over their computers (and more data) to Claude and Sonnet 4.6 is an important part of that strategy. Sonnet 4.6 scored 72.5% on the OSWorld-Verified benchmark, which tests AI"s ability to use actual computers. Users can now ask Claude to perform hundreds of tasks across real applications like Google Chrome or LibreOffice, and the model will execute them with increased precision. However, it"s still not flawless, so you might want to double-check its results on more sensitive tasks.
On that note, Anthropic is also improving the security of the latest Sonnet model. The company claims it"s improved the model"s resistance to prompt injections, bringing it to levels similar to Opus 4.6.
When it comes to coding, Anthropic claims Sonnet 4.6 produces fewer hallucinations, follows instructions better, and over-engineers less. Internal tests showed that early Claude Code users preferred Sonnet 4.6 over its predecessor 70% of the time. They even preferred it over Opus 4.5, Anthropic"s flagship from November 2025, in 59% of the time.
You can check the full release notes of Claude Sonnet 4.6 on Anthropic"s website.