Google · Frontier

Gemini 3.1 Pro Preview API pricing

Google's long-context flagship. At 30.5 percent below list, Gemini carries the largest discount of the three frontier labs on SayGM.

Snapshot October 2026 · USD per million tokens · Best for: long context, multimodal input, document analysis

SayGM, in / out: $1.39 / $8.34; No top-up fee
OpenRouter, in / out: $2.11 / $12.66; Includes the 5.5% top-up fee
Provider list price: $2.00 / $12.00; Google direct
Per 100M tokens, 80/20: $278; $422 on OpenRouter

§ 01

What a month costs

The same three workloads used across the index. At every level the SayGM bill is about 34% lower.

Fig. 1Monthly bill at three usage levels, Gemini 3.1 Pro Preview

OpenRouter, fee included
SayGM

Side project5M in · 1M out

$23

$15

Production app50M in · 15M out

$295

$195

High volume500M in · 100M out

$2,321

$1,529

Show data as a table

	OpenRouter, fee included	SayGM
Side project (5M in · 1M out)	$23	$15
Production app (50M in · 15M out)	$295	$195
High volume (500M in · 100M out)	$2,321	$1,529

Usage is millions of input and output tokens per month. No caching discount applied. Source: published rate cards, October 2026 snapshot. Current prices on saygm.com.

§ 02

Where the money goes

Output tokens cost 6.0 times more than input on Gemini 3.1 Pro Preview. At an 80/20 mix they make up 60% of the bill.

Fig. 2Share of the bill from output tokens at an 80/20 token mix

Input tokens (80% of volume)
Output tokens (20% of volume)

Gemini 3.1 Pro Preview

Gemini 3.5 Flash

Show data as a table

Model	Share of bill from input	Share of bill from output
Gemini 3.1 Pro Preview	40%	60%
Gemini 3.5 Flash	40%	60%

Output tokens are a fifth of the volume but most of the cost on every frontier model. Trimming output length saves more than trimming prompts. Source: published rate cards, October 2026 snapshot. Current prices on saygm.com.

§ 03

Estimate a Gemini 3.1 Pro Preview bill

Model

Input tokens per month50M

Output tokens per month10M

Monthly bill by provider

OpenRouter, fee included$232
Requesty, 5% included$231
Vercel AI Gateway$220
Google direct, list price$220
SayGM$153

A year, vs the cheapest alternative: $805; 31% lower than Vercel AI Gateway
A year, vs OpenRouter: $950; Fee included

Uncached prices from the October 2026 snapshot. Prompt caching lowers every provider's bill; batch jobs bought direct cost half of list. Current SayGM rates are on saygm.com (opens in a new tab).

§ 04

Other Google models

USD per million tokens, input and output. OpenRouter includes its 5.5% top-up fee. Snapshot from October 2026.
Model	SayGMin / out	OpenRouterin / out, fee incl.	SayGM vs OpenRouter80/20 blend
Gemini 3.1 Pro PreviewGoogle	$1.39 / $8.34	$2.11 / $12.66	34% lower
Gemini 3.5 FlashGoogle	$1.04 / $6.26	$1.58 / $9.50	34% lower

§ 05

Compare and set up

§ 06

Gemini 3.1 Pro Preview questions

How much does Gemini 3.1 Pro Preview cost on SayGM?

As of October 2026, $1.39 per million input tokens and $8.34 per million output tokens, with no top-up fee. Prices are set per epoch and capped at list, so check saygm.com for the live rate.

Is Gemini 3.1 Pro Preview cheaper on SayGM or OpenRouter?

SayGM is about 34 percent cheaper at an 80/20 input to output mix once OpenRouter's 5.5 percent fee is included.

Which API does SayGM use for Gemini 3.1 Pro Preview?

The model's native API. Google features such as caching, tool use and structured output work unchanged. Any OpenAI-compatible SDK works by changing the base URL.