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Opus is normally $5 per mtok, no idea why anyone would use /fast if they were at all concerned about price. ($5 is still pricy though tbh)


Opus is $5 per mtok of input tokens, but $25 for output.


Yes, but input is usually what people are talking about since that is the vast majority of token usage.


I wouldn't call input a vast majority of token usage. In my experience output is 25%-33% of the cost.




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