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Anthropic releases Claude Sonnet 5.5

4 reports 4 reporting sources 2026-09-30New

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AWS announced that Claude Sonnet 5.5 is available on Amazon Bedrock and Claude Platform on AWS, positioned as a more efficient Sonnet model for coding and knowledge work, with lower per-task cost and faster speed on most tasks.

From AWS Machine Learning Blog

Latest development9/30 09:44 (UTC+8)
An in-depth breakdown of Sonnet 5.5: Half-price Opus is only the surface; Agent Runtime is the core of the change雷锋网

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9/30
  1. 雷锋网
    Deep dive into Sonnet 5.5: half-price Opus is only the surface; agent runtime is the core shift

    Anthropic released Claude Sonnet 5.5. API prices are unchanged and generation is faster, while its scores rose substantially on agent benchmarks such as Terminal-Bench and CursorBench.

9/29
  1. Simon WillisonPicks
    Anthropic releases Claude Sonnet 5.5

    Anthropic has released Claude Sonnet 5.5. The company says it runs more than 30% faster and costs up to 30% less on most tasks. It retains Sonnet 5's pricing while outperforming its predecessor across benchmarks.

  2. AWS Machine Learning BlogPicks
    Claude Sonnet 5.5 launches on Amazon Bedrock and Claude Platform on AWS

    AWS announced that Claude Sonnet 5.5 is available on Amazon Bedrock and Claude Platform on AWS. It is positioned as a more efficient Sonnet model for coding and knowledge work, with lower per-task costs and faster speed for most tasks.

  3. Anthropic · XPicks
    Anthropic releases Claude Sonnet 5.5

    Anthropic has announced the release of Claude Sonnet 5.5, the second model in the Claude 5.5 family. The company says it runs more than 30% faster than Sonnet 5 and costs up to 30% less for most work.

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