Anthropic releases Claude Sonnet 5 with enhanced agentic capabilities

Anthropic has released Claude Sonnet 5, an updated mid-tier model that significantly improves agentic capabilities and performance over its predecessor, Sonnet 4.6. This new model demonstrates enhanced abilities in planning, browser and terminal navigation, and autonomous task execution, making it more suitable for complex, multi-step operations. While Sonnet 5 offers a strong cost-performance ratio, particularly at lower effort levels, Anthropic recommends reserving the flagship Opus 4.8 model for highly accuracy-critical tasks. AI

IMPACT Enhances agentic capabilities in mid-tier models, potentially lowering costs for complex tasks and influencing routing strategies.

RANK_REASON Frontier-lab model release with system card [lever_c_demoted from frontier_release: ic=1 ai=1.0]

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• Anthropic
• Claude Code
• Claude Haiku 4.5
• Claude Opus 4.8
• Claude Platform
• Claude Sonnet 4.6
• Claude Sonnet 5
• GDPval-AA v2
• OSWorld-Verified
• SWE-bench Pro
• Terminal-Bench 2.1
• Zapier

• model release
• product

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