Claude Sonnet 4.6

Claude Sonnet 4.6, released on February 17, 2026, is the balanced mid-tier model in the Claude 4.6 generation. Sonnet offers a strong intelligence-to-cost ratio, making it the default working model for most use cases that don’t require Opus’s peak capability.

It is well suited to coding, analysis, writing, customer-facing assistants, and general agent tasks at production scale — delivering near-Opus quality on most workloads at a fraction of the cost.