Anthropic is upgrading Claude Sonnet, replacing Sonnet 4.6 from February with Sonnet 5 as the best medium-sized model.
Claude Sonnet 5 has arrived as ‘most agentic Sonnet model yet’
In Anthropic’s universe, Sonnet is Claude’s medium-sized AI model that sits between the smaller Haiku model and the larger Opus model.
“Claude Sonnet 5 is built to be the most agentic Sonnet model yet. It 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,” the company says.
“Sonnet 5 narrows the gap: its performance is close to that of Opus 4.8, but at lower prices. It’s a substantial improvement over its predecessor, Sonnet 4.6, on important aspects of agentic performance like reasoning, tool use, coding, and knowledge work.”
