reroute

Google: Gemini 3.1 Pro Preview Custom Tools

google/gemini-3.1-pro-preview-customtools
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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...

Modalities
In / Out Price
$2 / $12 per 1M
Context
1M
Released
Feb 25, 2026
Knowledge Cutoff
—

API

Reroute speaks the OpenAI Chat Completions format. Point any OpenAI SDK at https://reroute.wtf/api/v1 and use google/gemini-3.1-pro-preview-customtools as the model.

You need an API key
Keys start with sk-rr-v1- and are shown once.
Create API key
curl https://reroute.wtf/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $REROUTE_API_KEY" \
  -d '{
  "model": "google/gemini-3.1-pro-preview-customtools",
  "messages": [
    { "role": "user", "content": "What is the meaning of life?" }
  ]
}'

Streaming

Set stream: true to receive server-sent events. The final chunk carries usage and cost.

curl -N https://reroute.wtf/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $REROUTE_API_KEY" \
  -d '{ "model": "google/gemini-3.1-pro-preview-customtools", "stream": true,
        "messages": [{ "role": "user", "content": "Count to five" }] }'