AI BriefingClaude Sonnet 5 Released
Key point
Anthropic has released Claude Sonnet 5, an agent-specialized model with significantly improved reasoning, tool use, and coding capabilities.
Details
Anthropic has unveiled Claude Sonnet 5, its most powerful agentic model yet. This model autonomously uses tools such as browsers and terminals, and can perform complex planning and execution tasks that were previously handled by larger, more expensive models.
Sonnet 5 shows substantial improvements over its predecessor, Sonnet 4.6, across agentic performance including reasoning, tool use, coding, and knowledge work, and approaches the performance of Opus 4.8 while offering it at a much lower cost.
Key features include:
- Enhanced agentic capabilities: Able to complete complex tasks and review its own outputs without explicit requests to do so
- Cost efficiency: Delivers high-quality agentic task performance at a lower price than Opus 4.8
- Improved safety: Better resistance to harmful requests and prompt injection attacks compared to Sonnet 4.6
Claude Sonnet 5 is now available as the default model for Free and Pro plans, and is also accessible to Max, Team, and Enterprise users. Introductory API pricing is offered at a discounted rate of $2 per million input tokens and $10 per million output tokens until August 31, 2026.
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