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This is what I realized, can you provide more detail on how you've observed this? The /usage screen does not make it clear.

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Not the original commenter, but personally I noticed my quota usage didn’t feel like it was being spent at a much lower rate when using Sonnet even on a relatively low thinking budget and based on a few comments here it seems I might not be the only one. Has anyone else noticed this? Wasn’t it different in the past? I thought I would be getting to use Sonnet much much more than Opus but it did not feel that way despite being on 20x plan.

This is exactly what people have been talking about in this thread.

Sonnet is dumber and more expensive than Opus.

The token efficiency improvements in Opus are missing in Sonnet. Sonnet generates more output tokens and more reasoning tokens.

Any price advantage per token disappears due to volume.

It doesn't make sense to use Sonnet if you have access to Opus.

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