Calculating price increases is made more complex by the difference in token usage. From https://blog.google/products/gemini/gemini-3-flash/ :
> Gemini 3 Flash is able to modulate how much it thinks. It may think longer for more complex use cases, but it also uses 30% fewer tokens on average than 2.5 Pro.
Yes, but also most of the increase in 3 Flash is in the input context price, which isn't affected by reasoning.
It is affected if it has to round-trip, e.g. because it's making tool calls.