Is Gemini 3.1 Pro Preview or Gemini 3.6 Flash cheaper?
Gemini 3.6 Flash is cheaper ($1.50 / 1M tokens input / $7.50 / 1M tokens output) vs Gemini 3.1 Pro Preview ($2 / 1M tokens input / $12 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.