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What is Anthropic Claude Sonnet 5.5?

Anthropic has released Claude Sonnet 5.5 on Monday. It is the second model in its Claude 5.5 family. The AI lab is expanding its product lineup ahead of a planned IPO. Sonnet 5.5 is a faster and lower-cost option than Claude Opus 5.5.

29 Sep 2026 12:18 am