Anthropic releases Claude Sonnet 5.5 on Amazon Bedrock
What happened
On 29 September 2026, Anthropic released Claude Sonnet 5.5, the second model in the Claude 5.5 family. The Decoder reports over 30% faster output generation, up to 30% lower cost per task and performance close to Opus 5.5 on several benchmarks. TechCrunch reported that day that it was 30% faster than Sonnet 5 and positioned as an everyday assistant for tasks including coding and office documents. AWS announced availability on Amazon Bedrock and Claude Platform on AWS, describing a more efficient Sonnet for coding and knowledge work, faster and cheaper per task for most work. Simon Willison also reported official claims of over 30% faster operation and up to 30% lower cost for most work, with the same pricing as Sonnet 5 but better results on every benchmark. It is now offered through Amazon Bedrock and Claude Platform on AWS.
Written by AI from the reports · updated 2 d ago
Developments
- Sep 29 02:57 · 1 reportsClaude Sonnet 5.5 launches on Amazon BedrockAWS Machine Learning Blog：Introducing Claude Sonnet 5.5 on AWS
- Sep 29 02:00 · 3 reportsAnthropic releases Claude Sonnet 5.5The Decoder：Anthropic's Claude Sonnet 5.5 nearly matches Opus 5.5 on benchmarks while costing up to 30 percent less per task
Timeline
Follow the reports to see the event from each side.
- Simon WillisonSelectedClaude Sonnet 5.5
Anthropic released Claude Sonnet 5.5, officially claiming over 30% faster operation and up to 30% lower cost for most work. Pricing matches Sonnet 5, but it outperforms Sonnet 5 on every benchmark.
- AWS Machine Learning BlogSelectedIntroducing Claude Sonnet 5.5 on AWS
AWS announced Claude Sonnet 5.5 availability on Amazon Bedrock and Claude Platform on AWS, positioning it as a more efficient Sonnet for coding and knowledge work, with lower cost per task and faster speeds for most tasks.
- The DecoderSelectedAnthropic's Claude Sonnet 5.5 nearly matches Opus 5.5 on benchmarks while costing up to 30 percent less per task
Anthropic released Claude Sonnet 5.5, the second model in the Claude 5.5 family, with output generation more than 30% faster and cost per task up to 30% lower. It approaches Opus 5.5 on several benchmarks.
- TechCrunch · AIAnthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner
Anthropic released its mid-tier Sonnet 5.5 model, saying it is 30% faster than Sonnet 5 and consumes tokens substantially more slowly. It is positioned as an everyday task assistant for coding and office document generation.
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