Claude Sonnet 5 launches with smarter reasoning, stronger safety for Free and Pro users

TL;DR Claude Sonnet 5 is designed to tackle multi-step tasks more independently, with support for web browsing, planning, and developer tools. The new model promises near-Opus 4.8 performance at a lower cost, while improving on Sonnet 4.6 in reasoning, reliability, and safety. Sonnet 5 is now the default model for Claude’s Free and Pro users, with built-in cyber safety protections enabled.