Claude Sonnet 5 makes AI agents affordable
Anthropic launched Claude Sonnet 5, and the headline is price. It is built to run AI agents, meaning software that does multi-step tasks on its own, at a much lower cost than top-tier models.
An agent is basically an AI that can take action, not just chat. Think booking, sorting, researching, or moving data between apps without you babysitting each step. Until now, running those agents on the strongest models got expensive fast.
The numbers tell the story. Sonnet 5 runs at $2 per million input tokens and $10 per million output as an introductory rate through August 31, then settles at $3 and $15. For that price Anthropic says it performs close to Opus 4.8, its top-tier model, while beating the older Sonnet 4.6 on reasoning, tool use, and coding. It is now the default model on the free and Pro plans.
There is a safety angle too. Anthropic reports Sonnet 5 shows fewer undesirable behaviors than Sonnet 4.6 and is generally safer to let run on its own, which matters the moment you hand an agent real tasks.
Why it matters Near-top-tier capability at a fraction of the price means small teams can finally automate real workflows without an enterprise budget.