Is Gemini 3.1 Pro Preview or Gemini 3.5 Flash cheaper?

Gemini 3.5 Flash is cheaper on output tokens ($9.00 vs $12.00 per 1M).

Which has the larger context window, Gemini 3.1 Pro Preview or Gemini 3.5 Flash?

Both models offer a similar context window.

Gemini 3.1 Pro Preview vs Gemini 3.5 Flash

Gemini 3.5 Flash is cheaper on output tokens. Choose Gemini 3.1 Pro Preview or Gemini 3.5 Flash based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Gemini 3.1 Pro Preview	Gemini 3.5 Flash
Provider	GitHub Copilot	GitHub Copilot
Input / 1M tokens	$2.00	$1.50
Output / 1M tokens	$12.00	$9.00
Context window	200K	200K
Parameters	—	—
Open weights	No	No
Released	Feb 2026	May 2026

Gemini 3.1 Pro Preview details →Gemini 3.5 Flash details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.