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Sonnet 5.5 vs Opus 5.5 on a from-scratch Rust decompressor: same correctness, a quarter of the price

With Sonnet 5.5 out today I wanted to know if it's actually close to Opus 5.5 or if the benchmarks are flattering it. So I gave both (plus GPT-6 Sol and Luna for reference) the same self-contained task. The task: write a DEFLATE/zlib decompressor in Rust. No dependencies, no unsafe, strict rules fo…

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  1. 2026-09-28 19:26 · r/ClaudeAI
    Sonnet 5.5 vs Opus 5.5 on a from-scratch Rust decompressor: same correctness, a quarter of the price

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