Haiku 5.5 vs Opus 5 browser-use test: misses one defect but looks like a cheap drop-in
kevinkern · x · 2026-10-08
Developer kevinkern ran a quick browser-use comparison between Haiku 5.5 and Opus 5: Haiku missed one defect in testing, but at its price point looks like a solid drop-in replacement. His idea: spawn many cheap, fast agents to run live tests on your apps, reserving pricier models for the few critical steps. If Haiku 5.5 ships, the economics of parallel testing agents shift noticeably.
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