Anthropic rolls out Sonnet 5 with near-Opus 4.8 performance at a lower price

Anthropic has released Claude Sonnet 5, a new AI model that performs nearly as well as their expensive flagship model (Opus 4.8) but costs significantly less. Sonnet 5 is designed to be 'agentic,' meaning it can make plans, use tools like browsers and terminals, and check its own work, capabilities that were previously limited to more expensive models. The model is available now with introductory pricing of $2 per million input tokens (the words you feed it) and $10 per million output tokens (the words it generates) through August 2026.