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Daniel Mewes
@dmewes.com

The use cases for Sonnet 5.5 still seem pretty niche. It will be cheaper than Opus 5.5 in tasks that require little reasoning and have large inputs, due to lower input token cost. But on all the agentic benchmarks it seems to be at best equal to Opus 5.5 in performance/$?

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Daniel Mewes
@dmewes.com

I imagine it produces tokens a little faster than Opus 5.5. So maybe it's faster on some tasks? That could be a use case. Similar to cost, this advantage might disappear when the task requires extensive reasoning or tool calls, where it will need to use more.