Is Gemini 3.1 Pro Preview Custom Tools or GPT-3.5-turbo cheaper?

GPT-3.5-turbo is cheaper on output tokens ($1.50 vs $18.00 per 1M).

Which has the larger context window, Gemini 3.1 Pro Preview Custom Tools or GPT-3.5-turbo?

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

Gemini 3.1 Pro Preview Custom Tools vs GPT-3.5-turbo

GPT-3.5-turbo is cheaper on output tokens, while Gemini 3.1 Pro Preview Custom Tools offers a larger context window. Choose Gemini 3.1 Pro Preview Custom Tools or GPT-3.5-turbo based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Gemini 3.1 Pro Preview Custom Tools	GPT-3.5-turbo
Provider	OrcaRouter	OrcaRouter
Input / 1M tokens	$4.00	$0.50
Output / 1M tokens	$18.00	$1.50
Context window	1M	16K
Parameters	—	20B
Open weights	No	No
Released	Feb 2026	Mar 2023

Gemini 3.1 Pro Preview Custom Tools details →GPT-3.5-turbo details →

FAQ

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