tech

February 17, 2026

Anthropic releases Sonnet 4.6

Anthropic has released a new version of its mid-size Sonnet model, keeping pace with the company's four-month update cycle.

Anthropic releases Sonnet 4.6

TL;DR

  • Anthropic released Sonnet 4.6, a new version of its mid-size AI model.
  • The update cycle maintains a four-month cadence.
  • Improvements focus on coding, instruction-following, and computer use.
  • Sonnet 4.6 will be the default for Free and Pro plan users.
  • A beta release includes a 1 million token context window, double the previous size.
  • The new context window is capable of processing large amounts of data like entire codebases or lengthy contracts.
  • This release follows the launch of Opus 4.6, with Haiku 4.6 expected soon.
  • Sonnet 4.6 achieved record benchmark scores in OS World (computer use) and SWE-Bench (software engineering).
  • It scored 60.4% on ARC-AGI-2, a test of human intelligence-like skills, surpassing most comparable models but still trailing Opus 4.6, Gemini 3 Deep Think, and a refined GPT 5.2 version.

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