LaunchDevelopersSeptember 29, 2026

Claude Code 2.1.284 adds Sonnet 5.5 as default Sonnet model

Read original source →code.claude.com

Claude Sonnet 5.5 (claude-sonnet-5-5) is now the default Sonnet model on the Anthropic API, with 1M context and $2/$10 per Mtok, plus $0.20/Mtok cache reads. The changelog also adds a "Yes, but ask again next time" option to auto mode's out-of-directory read prompt.

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