Gemini 3.1 Pro Preview Customtools

ChatInput: TextInput: AudioInput: ImageInput: FileReleased Feb 25, 2026

Built by Google · United States · deepmind.google

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...

How to use

model: "google/gemini-3.1-pro-preview-customtools"

Cap quality here and save

Hard questions go to this model, easy ones drop to something cheaper. Set a savings target (0–0.8) and the router tunes itself until realized savings converge on it.

{
  "model": "celon/auto",
  "celon": {
    "anchor": "google/gemini-3.1-pro-preview-customtools",
    "savings_target": 0.4
  }
}

Naming a model directly gets you that model — savings controls don't apply.

Context

1.0M

Max output

66K

Input $/1M

$2.00

Output $/1M

$12.00

Features

Image inputTool callingJSON

Serving providers

Google

Providers

Price, latency, and uptime per provider serving this model. Celon routes each request to the fastest and cheapest of them. Click a row for regions and data policies.

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Performance

Benchmark quality scores, and measured speed per provider.

Quality

Epoch Capabilities IndexComposite over 50+ benchmarks

154.8

SWE-bench VerifiedReal GitHub issue resolution

75.6%

At each model's best reasoning effort. Benchmarks it wasn't run on are omitted.

Speed

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