Key Info
Claude Sonnet 5.5, the second model in Anthropic's Claude 5.5 family, is now available on OpenRouter with 1M context at $2/M input and $10/M output.
Highlights
- Described as significantly smarter than Sonnet 5 with much clearer writing
- More than 30% faster and up to 30% cheaper for most workloads
- 1M context window priced at $2/M input and $10/M output, unchanged from Sonnet 5
- Positioned as the second model in the Claude 5.5 family
