Claude Sonnet 5.5 vs. DeepSeek V4.1 Flash

Quick Verdict: Route autonomous coding to Claude Sonnet 5.5 (82.9% SWE-bench Verified), hard scientific reasoning to DeepSeek V4.1 Flash (91.8% GPQA Diamond), and high-volume cost-sensitive workloads to DeepSeek V4.1 Flash.

Claude Sonnet 5.5 (Anthropic)

92.8 pt

SWE: 82.9% · GPQA: 91.4% · $3.00/1M · Adopt Now

DeepSeek V4.1 Flash (DeepSeek (MIT))

89.7 pt

SWE: 79.5% · GPQA: 91.8% · $0.22/1M · Hold Cluster (R3 Near)

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