Is Gemini 3.1 Pro Preview or GPT-5.5 cheaper?

Gemini 3.1 Pro Preview is cheaper on output tokens ($12.00 vs $30.00 per 1M).

Which has the larger context window, Gemini 3.1 Pro Preview or GPT-5.5?

GPT-5.5 has the larger context window (1.1M tokens).

Gemini 3.1 Pro Preview vs GPT-5.5

Gemini 3.1 Pro Preview is cheaper on output tokens, while GPT-5.5 offers a larger context window. Choose Gemini 3.1 Pro Preview or GPT-5.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Gemini 3.1 Pro Preview	GPT-5.5
Provider	FastRouter	FastRouter
Input / 1M tokens	$2.00	$5.00
Output / 1M tokens	$12.00	$30.00
Context window	1M	1.1M
Parameters	—	—
Open weights	No	No
Released	Feb 2026	Apr 2026

Gemini 3.1 Pro Preview details →GPT-5.5 details →

FAQ

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