Anthropic Launches Claude Sonnet 5 With Stronger Agentic Capabilities at Lower Cost

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Anthropic released Claude Sonnet 5 on June 30, 2026, positioning it as its most capable agentic Sonnet model to date. The model is designed to plan, use tools such as browsers and terminals, and operate autonomously across multi-step tasks — workloads that previously required larger, more expensive models. Anthropic describes Sonnet 5's performance as close to that of Opus 4.8 but at a lower price point, and as a substantial improvement over its predecessor, Sonnet 4.6, in reasoning, tool use, coding, and knowledge work. The release also includes safety-focused changes, including lower rates of hallucination and sycophancy, as well as deliberately reduced capability on offensive cybersecurity tasks. Notably, Sonnet 5 ships with a new tokenizer that can increase token counts by up to 35%, a factor with significant cost implications for developers running agents in continuous loops.

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