Claude Sonnet 5.5 keeps Sonnet 5’s price, cuts cost per task

On Terminal-Bench 4.0, an agentic coding test, the new Sonnet 5.5 from Anthropic scores 70.6%. Sonnet 5 scored 10.3%. It follows Opus 5.5 in the Claude 5.5 family and targets well-scoped everyday tasks.

Pricing stays at $2 per million input tokens and $10 per million output. Anthropic says the model needs far fewer tokens, so a task costs up to 30% less, and output runs 30%+ faster.

It’s also the first Sonnet to ship with cyber safeguards: higher-risk security tasks visibly fall back to Sonnet 5. Anthropic says Opus 5.5 is still clearly stronger at complex, open-ended work.

Sonnet 5.5 is live on all platforms, including Amazon Web Services, Google Cloud and Microsoft Azure, as claude-sonnet-5-5.