tech
Anthropic launches Claude Sonnet 5 as a cheaper way to run agents
Anthropic’s Claude Sonnet 5 brings stronger agentic capabilities, lower pricing, and improved safety, positioning the model as a cheaper alternative to Opus, GPT-5.5, and Gemini Pro.
TL;DR
- Anthropic's Claude Sonnet 5 is a more powerful and agentic version of its midsize model.
- The new model can make plans, use tools like browsers and terminals, and run autonomously.
- Agentic capability is becoming a baseline expectation, with cost and reliability as key differentiators.
- Sonnet 5 offers performance close to Opus 4.8 at a much lower cost, undercutting competitors like GPT-5.5 and Gemini Pro.
- It demonstrates significant improvements over its predecessor, Sonnet 4.6, in reasoning, tool use, coding, and knowledge work.
- On agentic coding benchmarks, Sonnet 5 scores 63.2%, compared to Opus 4.8's 69.2% and Sonnet 4.6's 58.1%.
- Sonnet 5 also shows a lower rate of "undesirable behaviors" and improved safety features compared to Sonnet 4.6.
- While Opus 4.8 remains superior for higher accuracy on complex tasks, Sonnet 5 provides a more cost-effective option for developers.
- Testers report Sonnet 5 excels at completing complex tasks autonomously and checks its own output.