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Google: Gemini 3.1 Pro Preview Custom Tools

google/gemini-3.1-pro-preview-customtools

Google: Gemini 3.1 Pro Preview Custom Tools is a 1,048,576-token model served on Composite at $2.50 per million tokens in and $15.0 per million tokens out. Ranked #21 of 194 models by traffic on Composite over the last 30 days, taking 0.69% of tokens and 0.4% of requests. Measured on Composite, 100.0% of its last 100 requests on Composite succeeded, the typical first token arrives in 24750 ms, output runs at about 146.1 tokens per second.

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Specifications

Specifications and pricing as served by Composite
Model IDgoogle/gemini-3.1-pro-preview-customtools
Providercv11
Context window1,048,576 tokens
Acceptstext, audio, image, video, file
Returnstext
Input price$2.50 per million tokens
Output price$15.0 per million tokens
Prompt cachingSupported — cached input is billed at the provider's cache rate, on credits and plans alike
Image input$0.0000025 per image
Audio input$0.0000025 per second
Reasoning tokens$15.0 per million tokens
Web search$0.0175 per result
ThinkingAlways on for this model
ModeratedNo
Cost on a monthly planAbout 28 plan credits per typical call (8k in, 1k out)
Routing endpoints2 (base plus 1 routing variant)

Traffic rank on Composite

#21 of 194

0.69% of tokens and 0.4% of requests over 30 days.

Success rate

100.0%

Across the last 100 requests Composite served for this model.

Time to first token

24750 ms

Median across the same sample.

Output speed

146.1 tok/s

Median generation rate after the first token.

Prompt cache hits

82.9%

Share of prompt tokens served from the provider's cache over 7 days.

Routing variants

The same model behind 1 alternative endpoint. Call the id directly to pin a route; the base id above picks for you.

RouteModel IDProviderPrice
cheapThink google/gemini-3.1-pro-preview-customtools:cheapThink cv11 $2.50 per million tokens input · $15.0 per million tokens output

Pricing

$2.50 per million tokens input · $15.0 per million tokens output

Credits pay the provider’s price plus 25%; cache hits cost less.

On a monthly plan, a typical call (8k tokens in, 1k out) uses about 28 plan credits, at the provider's own price.

Provider

cv11

Roleplay fit

Gemini models combine large context windows with fast throughput, which keeps response times low even in busy group chats.

Context behavior

With a 1,048,576-token context window, it can hold a long-running roleplay or a full lorebook in memory without losing earlier plot details, so it suits multi-session campaigns and character cards with heavy backstory.

Cost for regular use

It sits in the mid-range on price, a reasonable pick for regular roleplay use without going for the cheapest option available.

From the provider

Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...

Supplied by cv11, not written by Composite.