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r/ClaudeAI
by DJJonny
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Claude Max subscriber - any reason to use Sonnet/Haiku over Opus 4.5 besides speed?
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I’m on Claude Max with the higher limits, so cost isn’t really a factor for me. Trying to figure out if there’s any actual benefit to using Sonnet 4.5 or Haiku 4.5 for Claude Code tasks beyond faster response times.
From what I understand:
∙ Opus 4.5 is objectively the most capable - best reasoning, most accurate code generation, better at handling complex requirements
∙ Sonnet 4.5 is faster (2-3x) and cheaper, but otherwise just produces lower quality output
∙ Haiku 4.5 is even faster but even less capable
Since I can switch models mid-conversation and limits aren’t my concern, is there any situation where Sonnet or Haiku would actually produce better code for certain types of tasks? Or is it purely a speed vs. quality trade-off where Opus wins every time if you’re willing to wait?
I’m currently defaulting to Opus for everything and just accepting the slightly longer response times, but wanted to check if I’m missing something - like maybe Sonnet is actually better for straightforward CRUD implementations or something?
For context, I’m building internal automation tools and workflow systems, not huge production applications. (yet!).
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