Anthropic

Sonnet 5.5

The second model in Anthropic’s Claude 5.5 family — a faster, cheaper complement to Opus 5.5 that beats it on health, automation and scientific-research evals while trailing on long-horizon coding.

API pricing: $2.00 in / $10.00 out per million tokens

Sonnet 5.5 benchmark scores

Compare Sonnet 5.5