Claude Sonnet 5.5 vs. Muse Spark Open / Llama 4.2

Quick Verdict: Route autonomous coding to Claude Sonnet 5.5 (82.9% SWE-bench Verified), hard scientific reasoning to Claude Sonnet 5.5 (91.4% GPQA Diamond), and high-volume cost-sensitive workloads to Muse Spark Open / Llama 4.2.

Claude Sonnet 5.5 (Anthropic)

92.8 pt

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

Muse Spark Open / Llama 4.2 (Meta (Open))

86.4 pt

SWE: 74.8% · GPQA: 89.4% · $0.35/1M · Mid-Cycle (57%)

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