Anthropic today introduced Claude Sonnet 5, a more affordable model that narrows the gap between Sonnet and Opus. Anthropic says Claude Sonnet 5 is its most agentive Sonnet model yet, capable of making plans, using tools such as browsers and terminals, and operating autonomously.
Opus models have better agent capabilities, but are more expensive than Sonnet models. Sonnet 5’s performance is similar to Opus 4.8 and has improved over Sonnet 4.6 in areas such as reasoning, tool usage, coding, and knowledge work.
When it comes to agentic capabilities, Sonnet 5 is able to accomplish complex tasks that Sonnet 4.6 was unable to accomplish, and it verifies its own output without being asked. It is more effective at denying malicious requests, and Anthropic claims it has lower rates of hallucination and sycophancy.
Sonnet 5 is available on all plans and is the default model for Free and Pro plans. Its price is $2 per million input tokens and $10 per million output tokens until August 31, then the prices will increase to $3 and $15, respectively.
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