Claude Sonnet 5.5 is available on the free plan, unlike Opus 5.5
Anthropic has released Claude Sonnet 5.5, and free Claude.ai users get it too, on the web and in the apps. The model generates output more than 30% faster than Sonnet 5 and costs up to 30% less per task. Higher-risk cybersecurity requests still go to the older Sonnet 5.