Claude Sonnet 5.5 launches with promised speed gains and up to 30% lower costs for most work
Anthropic says Sonnet 5.5 runs more than 30% faster than Sonnet 5. In pre-release max-effort tests, Artificial Analysis measured per-task costs roughly 50% higher than Sonnet 5’s.
TLDR
Anthropic introduced Claude Sonnet 5.5, saying it runs more than 30% faster than Sonnet 5 and costs up to 30% less for most work. GitHub says the model is available in Copilot; in its early coding tests, it matched Sonnet 5 while using fewer steps, tokens and tool calls. Artificial Analysis ranked Sonnet 5.5 at max effort No. 2 on its Intelligence Index, but measured a per-task cost roughly 50% higher than Sonnet 5’s. Those evaluations used a pre-release version with a structured-output bug that Anthropic says it fixed. Artificial Analysis plans to rerun relevant tests.
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