Anthropic Claude Sonnet 5 vs Sonnet 4.6 vs Opus 4.8: Agentic Coding Benchmarks, API Pricing, and Cost-Performance Tradeoffs Compared
Anthropic just shipped Claude Sonnet 5. They call it its most agentic Sonnet model yet. It plans, drives browsers and terminals, and runs autonomously across long tasks. Sonnet 5 is the default model for Free and Pro plans today. Max, Team, and Enterprise users can select it. It is also live in Claude Code and on the Claude Platform. TL;DR Sonnet 5 is Anthropic’s most agentic mid-tier model, closing much of the gap to Opus 4.8. Beats Sonnet 4.6 on every published benchmark: 6
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Anthropic released Claude Sonnet 5, a mid-tier AI model positioned between its cheaper and more powerful offerings, with improvements focused on handling longer task chains and better self-correction when tools fail. The model beats its predecessor on every published benchmark, including agentic coding tasks where it scores 63.2% compared to the previous version's 58.1%, though Anthropic's flagship model still leads at 69.2%. Sonnet 5 offers introductory pricing that undercuts some competitors, making it the most cost-effective choice for low and medium complexity tasks, though the flagship model remains better for accuracy-critical work. The model introduces adjustable effort levels that trade off between reasoning depth and token consumption, allowing developers to balance quality and cost based on their specific needs.
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