Assertion 1
Sonnet 5.5 lands two points below Opus 5.5 on GDPval-AA, a test built from ordinary jobs across a spread of professions, and on Amazon's telling it is faster and cheaper per task than Opus 5.5 for most workloads Anthropic News AWS Machine Learning Blog.
Assertion status: No spot-check verdict is published for this assertion.
Anthropic introduced Claude Sonnet 5.5 as the second model in the Claude 5.5 family, positioning it as a faster, lower-cost complement to Claude Opus 5.5 for well-scoped everyday tasks.
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Claude Sonnet 5.5 scores 70.6% on the Terminal-Bench 4.0 agentic coding evaluation, compared to Claude Sonnet 5's score of 10.3%.
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Claude Sonnet 5.5 scores two points below Claude Opus 5.5 on the GDPval-AA test of real-world work across various occupations.
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Claude Sonnet 5.5 generates outputs 30% or more faster than Claude Sonnet 5.
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Claude Sonnet 5.5 costs up to 30% less per task than Claude Sonnet 5 in Anthropic's testing, despite having the same input and output token prices.
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Claude Sonnet 5.5 has lower cost per task than Claude Opus 5.5 for most workloads.
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Claude Sonnet 5.5 operates at faster speed than Claude Opus 5.5 for most workloads.
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Claude Sonnet 5.5 produces more polished documents and visuals than Claude Sonnet 5.
No stored spot-check names this claim in this edition.