Claude Sonnet 4.6 Model Brings 'Much-Improved Coding Skills', Upgraded Free Tier

Anthropic has released Claude Sonnet 4.6, the first upgrade to its mid-tier AI model since version 4.5 arrived in September 2025. The new model features a "1M token context window" and delivers a "full upgrade of the model's skills across coding, computer use, long-context reasoning, agent planning, knowledge work, and design." From Anthropic: Sonnet 4.6 brings much-improved coding skills to more of our users. Improvements in consistency, instruction following, and more have made developers with early access prefer Sonnet 4.6 to its predecessor by a wide margin. They often even prefer it to our smartest model from November 2025, Claude Opus 4.5. Performance that would have previously required reaching for an Opus-class model -- including on real-world, economically valuable office tasks -- is now available with Sonnet 4.6. The model also shows a major improvement in computer use skills compared to prior Sonnet models. The free tier now uses Sonnet 4.6 by default and with "file creation, connectors, skills, and compaction" included.

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