Anthropic has released Claude Sonnet 5, a model that rivals its pricier Opus 4.8 on many benchmarks while offering cheaper introductory rates. The launch sidesteps recent US government blocks of Anthropic's most capable models by keeping Sonnet 5's risky capabilities low and adding default cybersecurity guardrails. Developers and businesses can access it now, though agentic behavior may increase actual token consumption per task.
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Anthropic released Claude Sonnet 5, a new AI model that matches or beats its larger Opus 4.8 sibling on several benchmarks. On knowledge work (GDPval-AA v2), Sonnet 5 scores 1,618 points versus Opus 4.8's 1,615. The model is available now across all Anthropic plans, with introductory pricing of $2 per million input tokens and $10 per million output tokens through August 31, 2026.
Why it matters
Anthropic is positioning Sonnet 5 as capable of autonomous work—planning, using tools like browsers and terminals—that previously required more expensive models. The launch comes as the US government blocks Anthropic's two most capable models (Mythos 5 and Fable 5) over cybersecurity concerns, so Sonnet 5 sidesteps that issue: it scores far below those models on risky capabilities like writing software exploits, and Anthropic has enabled cyber safeguards by default. For businesses and developers, this suggests a cheaper way to access agent-like capabilities without premium pricing.
What to watch
Sonnet 5 does chew through more tokens per task due to its agentic behavior—meaning real-world costs could exceed the per-token savings. The model has a one-million-token context window and a training cutoff of January 2026. Prices rise to $3 per million input tokens and $15 per million output tokens after August 31, 2026.
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