Google › Gemini 3.1 Pro Preview Custom Tools › Pricing

Gemini 3.1 Pro Preview Custom Tools pricing

API list price by Google · same on Google AI Studio · checked Oct 23, 2026
Benchmarks and alternatives →
$2 / $12per 1M tokens in / out
$0.20cache read · −90%
#382on OpenRouter by tokens · 426M / week

Price sheetper 1M tokens

Input$2list
Output$12
Cache read$0.20−90% vs input
Cache write$0.38−81% vs input
Context · max output1M · 66Ktokens

Where to buy2 providers · per 1M tokens

ProviderInputOutputContext
googlelab$2$12—
Google AI Studio$2$121M

In Google's line-upper 1M in / out

Gemini 3.8 Flash Cyber$1.50 / $7.50−33%
Gemini 2.5 Pro$1.25 / $10−24%
Gemini 4 Argon$2 / $10−11%
Gemini 3.1 Pro$2 / $120%
Gemini 3.1 Pro Preview$2 / $120%
Gemini 3.1 Pro Preview Custom Tools$2 / $12this model
Gemini Deep Research Agent$2 / $120%
<
All Gemini API prices →

Cheaper for the same workvs Gemini 3.1 Pro Preview Custom Tools

GLM 5.2 maxOpen-52%score +4%$1.47
DeepSeek V4 Pro 0813 maxOpen-56%score +3%$1.32 / $3.96
Qwen3.7 Max max-51%score +2%$1.48 / $4.43
Kimi K2.6 unstatedOpen-62%score +1%$0.95 / $4
Qwen3.6 Max Preview unstated-35%score +1%$1.30 / $7.80
All alternatives and what breaks when you switch →

Pricing questions

How much does Gemini 3.1 Pro Preview Custom Tools cost?›

$2 per 1M input tokens and $12 per 1M output tokens on Google's API and Google AI Studio. Cached input is $0.20.

Is Gemini 3.1 Pro Preview Custom Tools free to use?›

There is no free API tier.

How much does prompt caching save?›

Cache reads cost $0.20 per 1M, 90% below the input price. Writing to the cache costs $0.38 per 1M.

What is a cheaper alternative to Gemini 3.1 Pro Preview Custom Tools?›

GLM 5.2 at max effort costs -52% per task with a score +4% on SWE-bench Verified · Epoch.