OpenRouter tests Claude Opus, Sonnet and Haiku 5.5 and picks a default

OpenRouter 实测 Claude Opus vs Sonnet vs Haiku 5.5 该选哪个

OpenRouter ran the three Claude models on the same coding tasks and recommends Sonnet 5.5 as the default. Haiku 5.5 suits high-volume requests and sub-agents, while Opus 5.5 is kept for long, ambiguous tasks where errors are costly.

Why it matters: All three models passed the tests, yet cost per task still differed by 19 to 30 times.