OpenRouter tested Claude Opus vs Sonnet vs Haiku 5.5: Which one should you choose?
OpenRouter tested three tiers of Claude models—Opus 5.5, Sonnet 5.5, and Haiku 5.5—and recommends using Sonnet 5.5 as the default. For frequent tasks and sub-agent workloads, choose Haiku 5.5. For long tasks with high tolerance costs, use Opus 5.5.
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