Anthropic announces Claude Sonnet 5.5, claiming responses over 30% faster than Sonnet 5
A September 29 post says Anthropic kept Sonnet 5.5’s API pricing at $2 per million input tokens and $10 per million output tokens, the same as Sonnet 5.
TLDR
A September 29 post says Anthropic announced Claude Sonnet 5.5 on September 28, US time. It relays Anthropic’s claims that the model responds over 30% faster than Sonnet 5 and costs up to 30% less for most tasks in its tests. The post says that claimed saving comes from using fewer tokens for the same work, not a cut to the per-token API price. It also notes that Anthropic considers Opus 5.5 stronger for tasks requiring sustained difficult decisions.
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