Claude Sonnet 5.5

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Available free on claude.ai, Claude Sonnet 5.5 places #2 on Arena WebDev (1774), Terminal-Bench 4.1 (63.9%), and Mercor APEX-SWE (66.4%), plus #4 on GDPval-AA v2.1 (1838).

Available free on claude.ai, Claude Sonnet 5.5 places #2 on Arena WebDev (1774), Terminal-Bench 4.1 (63.9%), and Mercor APEX-SWE (66.4%), plus #4 on GDPval-AA v2.1 (1838). It trails #5 GPT-6.1 Sol by 0.4 Intelligence Index points overall, but leads #7 Gemini 4 Argon by 4.0 BenchAlign points and 3.8 Intelligence Index points. Key 2026 benchmarks — Developer: Anthropic; Intelligence Index v5: 54.2 (#6); BenchAlign v5.8: 83.1 (#6); API Pricing (1M): $2 in / $10 out; Context Window: 1M tokens. Available free on claude.ai, Claude Sonnet 5.5 places #2 on Arena WebDev (1774), Terminal-Bench 4.1 (63.9%), and Mercor APEX-SWE (66.4%), plus #4 on GDPval-AA v2.1 (1838). Key benchmarks: Developer: Anthropic; Intelligence Index v5: 54.2 (#6); BenchAlign v5.8: 83.1 (#6); API Pricing (1M): $2 in / $10 out; Context Window: 1M tokens.

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