Anthropic releases Claude Sonnet 5.5: 70.6% on Terminal-Bench 4.0 at $2/$10

Anthropic launched Claude Sonnet 5.5, the second model in the Claude 5.5 family after Opus 5.5. It generates output 30%+ faster and cuts cost per task by up to 30%, with a 1M-token context window, and is available via the Claude API, AWS, Google Cloud and Azure at $2/$10 per million tokens.

• Terminal-Bench 4.0: 70.6%, up from 10.3% for Sonnet 5 and 66.4% for Opus 5.5
• Pricing unchanged: $2 per 1M input and $10 per 1M output tokens
• 1M-token context, 128K max output, five effort levels from low to max
• GDPval-AA v2.1: 1844 vs 1846 for Opus 5.5 and 1449 for Sonnet 5