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Gemini API prices, and the two dates that change them

2026/09/02

Gemini 3.1 Pro Preview charges $2 per million input tokens for prompts of 200k tokens or less, and $4 above that⁠[1]. Output is $12 and $18 on the same boundary⁠[1]. Batch halves both⁠[1].

Gemini 3.8 Flash, 3.7 Flash and 3.6 Flash are all $0.75 input and $3.75 output, with context caching at $0.075⁠[1]. Those are the prices through 31 December 2026⁠[1]. From 1 January 2027 all three double, to $1.50, $7.50 and $0.15⁠[1].

So two dates sit in front of anyone budgeting on Gemini: the 200k token step, which lands inside a single request, and the new year, which lands on every request at once⁠[1].