openai
Gemini 3.1 Pro Preview Custom Tools vs GPT-5.6 Terra
77.9 overall · $4.50 / 1M
Gemini 3.1 Pro Preview Custom Tools
google/gemini-3.1-pro-preview-customtools
reasoningtool callingaudio inputimage inputvideo inputfile inputprompt caching
Gemini 3.1 Pro Preview Custom Tools costs $2.00 per 1M input tokens and $12.00 per 1M output tokens with a 1.0M-token context window.
A reasoning, tool-calling model from google, released Feb 25, 2026. LiveBench hasn't published a run for it, so this page carries measured price and specs only — no benchmark numbers.
- Input / 1M
- $2.00
- Output / 1M
- $12.00
- Context
- 1.0M
- LiveBench overall
- Not evaluated
Specs and pricing
| Input price USD per 1M prompt tokens | $2.00 |
|---|---|
| Output price USD per 1M completion tokens, reasoning included | $12.00 |
| Blended price 3:1 input:output — #41 most expensive of 343 listed models | $4.50 |
| Cached input read Blank means not priced separately — not free | $0.200 |
| Cache write | $0.375 |
| Context window | 1,048,576 tokens |
| Max output | 65,536 tokens |
| Input modalities | text, audio, image, video, file |
| Tool calling | Yes |
| Extended reasoning | Yes |
| Knowledge cutoff | — |
| Listed | Feb 25, 2026 |
What Gemini 3.1 Pro Preview Custom Tools costs to run
Monthly list cost across five workload shapes, using the published cached-input rate where there is one. A floor, not a quote — batch discounts and cache writes aren't included.
| Workload | Per month |
|---|---|
| Support chatbot 1.2K in / 400 out × 200K requests | $1,310/mo |
| RAG assistant 8K in / 600 out × 100K requests | $1,600/mo |
| Coding agent 40K in / 4K out × 20K requests | $1,552/mo |
| Document extraction 20K in / 1.5K out × 50K requests | $2,810/mo |
| Bulk classification 500 in / 20 out × 5M requests | $5,300/mo |
Compare Gemini 3.1 Pro Preview Custom Tools with
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Gemini 3.1 Pro Preview Custom Tools vs Gemini 3.1 Pro Preview
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Gemini 3.1 Pro Preview Custom Tools FAQ
How much does Gemini 3.1 Pro Preview Custom Tools cost?
Gemini 3.1 Pro Preview Custom Tools lists at $2.00 per 1M input tokens and $12.00 per 1M output tokens, with cached input reads at $0.200 per 1M. A RAG assistant handling 100K requests a month (8K tokens in, 600 out) comes to about $1,600 at list price.
What is the context window of Gemini 3.1 Pro Preview Custom Tools?
Gemini 3.1 Pro Preview Custom Tools accepts up to 1,048,576 tokens of context and can return up to 65,536 output tokens per response.
Does Gemini 3.1 Pro Preview Custom Tools support tool calling?
Yes — Gemini 3.1 Pro Preview Custom Tools supports tool (function) calling and exposes extended reasoning. It accepts text, audio, image, video, file input.
How does Gemini 3.1 Pro Preview Custom Tools score on benchmarks?
LiveBench has not published a run for Gemini 3.1 Pro Preview Custom Tools yet. Until it does, compare it on price and specs, or run your own evaluation on your own tasks.
What is the API model ID for Gemini 3.1 Pro Preview Custom Tools?
On OpenRouter the model ID is "google/gemini-3.1-pro-preview-customtools". It was listed on Feb 25, 2026.
More from google
How these numbers are produced
- Price and specs — provider list data from OpenRouter, refreshed every 15 minutes. “Blended” is a 3:1 input:output mix.
- Scores and ranks — LiveBench release 2026-06-25. Ranks count only models that have a published run; a blank means “not evaluated”, never “bad”.
- Cost per point — the measured dollars LiveBench spent on the run, divided by the score it earned.
Published benchmarks rank models on someone else's tasks. Before committing, see LLM & agent evaluation for building an eval on your own.