Anthropic replaces Claude Sonnet 4.6 with new Sonnet 5 model

Anthropic has upgraded its Claude AI assistant by replacing the February-released Sonnet 4.6 with the new Claude Sonnet 5, positioned as the best medium-sized model in its lineup. The update targets developers and business users who rely on the mid-tier Claude offering. Sonnet 5 is described as the strongest model at its size class in Anthropic's portfolio.