Anthropic has released Claude Sonnet 5.5, the second model in the Claude 5.5 family, positioning it as a faster and more cost-effective complement to Claude Opus 5.5 for everyday tasks, bug fixing, and document polishing.
- Output generation is over 30% faster than previous versions, making it the fastest Sonnet to date.
- Cost per task drops by up to 30% due to reduced token usage and fewer tool calls, while list pricing remains $2/$10 per million tokens.
- The model achieves 70.6% on Terminal-Bench 4.0, a significant increase from Sonnet 5's 10.3%, and scores 55.5% on CursorBench 4.0.
- It features a 1M-token context window, 128K max output, and adaptive thinking with five effort levels, available via API, AWS, Google Cloud, and Azure.
The release offers users improved efficiency for well-scoped tasks without changing the base price point, leveraging token savings to reduce overall operational costs.