Claude Sonnet 5.5 is Anthropic's fast, cost-efficient AI model designed for everyday knowledge work. Positioned as the second model in the Claude 5.5 family, it is a clear upgrade over Claude Sonnet 5, running 30%+ faster and costing up to 30% less for most tasks. It handles coding, bug fixes, documents, slides, and design workloads with stronger performance in coding and knowledge-work tasks.
Claude Sonnet 5.5
Anthropic's second model in the Claude 5.5 family
Claude Sonnet 5.5 Introduction
More about Claude Sonnet 5.5
PricingPaid
ListedSep 30, 2026
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