Anthropic has launched Claude Sonnet 5, the successor to Sonnet 4.6, positioning it as a cost-effective option for AI agent workloads. The company's release notes emphasize that Sonnet 5 "can make plans, use tools like browsers and terminals, and run autonomously at a level that, just a few months ago, required larger and more expensive models." In benchmark tests, Anthropic claims Sonnet 5's performance "is close to that of Opus 4.8" — its flagship model — while maintaining a "much lower ability to perform dangerous cybersecurity tasks than our current Opus models." This represents a significant shift in Anthropic's strategy: making its most capable autonomous capabilities accessible at a mid-tier price point, which could dramatically lower the barrier for enterprises deploying AI agents. The model is available via the Anthropic API and Claude applications immediately.
Anthropic launches Claude Sonnet 5 as a cheaper way to run agents
updated at June 30, 2026