Tuesday, 21 July 2026 Sign in

Introducing Claude Sonnet 5

Anthropic News ● Covered by 3 sources

Anthropic released Claude Sonnet 5, a model designed to handle autonomous tasks like planning and tool use with performance approaching the more expensive Opus 4.8 model. Pricing is set at $2 per million input tokens and $10 per million output tokens through August 31, 2026, then increases to $3 and $15 respectively. The model becomes the default for Free and Pro users and is available across all Claude plans and platforms.

Why it matters

Our most agentic Sonnet yet, with top-tier intelligence for coding and everyday professional work.

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TLDRocket 21 July 2026

The open-weight AI model market hit an inflection point today as Alibaba and Kimi released trillion-parameter competitors that challenge the closed-model orthodoxy—just as Washington moved to restrict them. Alibaba's Qwen 3.8 Max (2.4 trillion parameters) and Kimi K3 (2.8T) are going open-weight, with K3 ranking first on Frontend Web App Arena and fourth on agentic benchmarks, signaling that scale and transparency can coexist. The timing matters: while U.S. policymakers weigh layered restrictions on Chinese open models, technical experts are pushing back hard, arguing that closed gardens actually hurt security and competition more than they help. The real fragmentation risk isn't technical—it's regulatory.

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Introducing Claude Sonnet 5

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