Claude Sonnet 5.5

Sonnet 5.5 is the newest model in Anthropic’s Sonnet line, and Anthropic’s pick for the best mix of speed and intelligence. It is priced at $2 per million input tokens and $10 per million output, holds a million tokens of context, and decides for itself how long to think before it answers.

For a lot of everyday brain work it is the sweet spot. It costs less than half of Opus 5 on both input and output, and it answers faster.

Best for: everyday agent work, chat that should feel quick, and anything where Opus is more model than the task needs.