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Sonnet 5

Anthropic · 2026-06-30

Claude Sonnet 5 is Anthropic's June 2026 Sonnet-class Claude model, an upgrade to Sonnet 4.6 with stronger broad capability, improved prompt-injection robustness, and adaptive thinking support for agentic and professional-work tasks.

Benchmark scores

BenchmarkScore
AA-Briefcase Elo1385
AA-LCR70.7
AA-Omniscience Index15.3
ALE-Bench1783
APEX-Agents32.5
APEX-SWE43.6
Arena Code WebDev — Brand & Marketing1559
Arena Code WebDev — Consumer Product1516
Arena Code WebDev — Content Creation Tools1501
Arena Code WebDev — Data & Analytics1496
Arena Code WebDev — Gaming1579
Arena Code WebDev — HTML1521
Arena Code WebDev — React1547
Arena Code WebDev — Reference-Based Design1550
Arena Code WebDev — Simulations1553
Arena Document (Style Controlled)1479
Arena Image-to-WebDev1540
Arena Text — Business, Management & Financial Ops (No Style Control)1437
Arena Text — Chinese (No Style Control)1477
Arena Text — Creative Writing (No Style Control)1410
Arena Text — English (No Style Control)1453
Arena Text — Entertainment, Sports & Media (No Style Control)1408
Arena Text — Exclude Ties (No Style Control)1440
Arena Text — Exclude Ties (Style Controlled)1469
Arena Text — Expert (No Style Control)1494
Arena Text — French (No Style Control)1458
Arena Text — French (Style Controlled)1485
Arena Text — German (No Style Control)1434
Arena Text — Hard Prompts (No Style Control)1464
Arena Text — Hard Prompts English (No Style Control)1466
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