Is Gemini 3.1 Pro Preview or GPT-5 cheaper?

GPT-5 is cheaper on output tokens ($10.00 vs $12.00 per 1M).

Which has the larger context window, Gemini 3.1 Pro Preview or GPT-5?

Gemini 3.1 Pro Preview has the larger context window (1M tokens).

Gemini 3.1 Pro Preview vs GPT-5

GPT-5 is cheaper on output tokens, while Gemini 3.1 Pro Preview offers a larger context window. Choose Gemini 3.1 Pro Preview or GPT-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
Provider	FastRouter	FastRouter
Input / 1M tokens	$2.00	$1.25
Output / 1M tokens	$12.00	$10.00
Context window	1M	400K
Parameters	—	—
Open weights	No	No
Released	Feb 2026	Aug 2025

Gemini 3.1 Pro Preview details →GPT-5 details →

FAQ

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