MODEL PROOF
Gemini 3.1 Pro Preview Custom Tools
NOT INDEPENDENTLY RATED
No independent LMArena score is published for this model.
Base context tier shown; inspect the complete context ladder below. · Reasoning tokens are billed separately.
- Independent LMArena score
- Not independently rated
- Context window
- 1.05M
- Maximum output
- 65.54K
- Input modalities
- text, audio, image, video, file
- Output modalities
- text
- Published input price
- $2.00 / 1M tokens
- Published output price
- $12.00 / 1M tokens
- Pricing kind
- fixed
- Context tiers
- Tiered by context
Inspect complete billing conditions and endpoint terms below.
Price from Google AI Studio: the cheapest offer that is serving, at standard delivery and at the maker’s precision or better, at its standard rate.
Every price dimension · USD per million tokens
| Input | $2.00/M |
|---|---|
| Output | $12.00/M |
| Cached input | $0.200/M |
| Cache write | $0.375/M |
| Cache write 1h | Unknown/M |
| Reasoning | $12.00/M |
| Web search | $0.014/call |
The headline rate does not apply to a long-context workload.
Complete context ladder · 1 tier
| More than 200,000 tokens | $4.00/M in (2×) $18.00/M out $0.400/M cached input $0.375/M cache write |
|---|
Reasoning tokens are billed separately at $12.00/M, on top of output. Its share of your bill depends on the reasoning tokens used.
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
1 provider offers · rates, limits and conditions
Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| Google AI Studiogoogle-ai-studio Endpoint terms
| $2.00 | $12.00 | undeclared | 99.94% |
Independent scores
No independent benchmark has measured this model. Unrated is not a score of zero.
Capability
| Context window | 1M |
|---|---|
| Max output | 65K |
| Input modes | text, audio, image, video, file |
| Tool use | yes |
| Reasoning | always on |
| Open weights | no |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-10-06 |
| Quality data | unrated |
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...
Questions this page answers
What does Gemini 3.1 Pro Preview Custom Tools cost?
$2.00/M in, $12.00/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription.
Does Gemini 3.1 Pro Preview Custom Tools have an independent quality score?
Gemini 3.1 Pro Preview Custom Tools has no independent quality score in this catalogue. Unrated is not a score of zero.
What beats Gemini 3.1 Pro Preview Custom Tools?
Gemini 3.1 Pro Preview Custom Tools has no independent quality score. Unrated is not a score of zero.
Does this page use Artificial Analysis scores for Gemini 3.1 Pro Preview Custom Tools?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
Does a missing score mean Gemini 3.1 Pro Preview Custom Tools scored zero?
Unrated is not a score of zero.
MODEL MONUMENT
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The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not.
[](https://undominated.ai/models/google__gemini-3.1-pro-preview-customtools/)<a href="https://undominated.ai/models/google__gemini-3.1-pro-preview-customtools/"><img src="https://undominated.ai/badge/google__gemini-3.1-pro-preview-customtools.svg" alt="Gemini 3.1 Pro Preview Custom Tools — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/google__gemini-3.1-pro-preview-customtools.svg — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never
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