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Ann NgUse gemini-3.1-pro-preview-customtools via OpenRouter API on TypingMind
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 or user-defined functions are available. This specialized preview endpoint significantly increases function calling reliability and ensures the model selects the most appropriate tool in coding agents and complex, multi-tool workflows.
It retains the core strengths of Gemini 3.1 Pro, including multimodal reasoning across text, image, video, audio, and code, a 1M-token context window, and strong software engineering performance.
Google: Gemini 3.1 Pro Preview Custom Tools Overview
| Full Name | Google: Gemini 3.1 Pro Preview Custom Tools |
| Provider | |
| Model ID | google/gemini-3.1-pro-preview-customtools |
| Release Date | Feb 25, 2026 |
| Context Window | 1,048,576 tokens |
| Pricing /1M tokens | $0.002 for input $0.012 for output $0.002 for image |
| Supported Input Types | text, audio, image, video, file |
| Supported Parameters | include_reasoningmax_tokensreasoningresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_p |
Complete Setup Guide
Create OpenRouter Account
- Visit openrouter.ai
- Click "Sign In" and create an account (free)
- Verify your email address
- You'll receive $1 in free credits to test models
Get Your OpenRouter API Key
- Log in to OpenRouter dashboard
- Go to "API Keys" section in the menu
- Click "Create API Key"
- Give it a name (e.g., "TypingMind")
- Copy your API key (starts with "sk-or-v1-...")
Add Credits to OpenRouter (Optional)
- Go to "Credits" in OpenRouter dashboard
- Click "Add Credits"
- Choose amount ($5 minimum, $20 recommended for testing)
- Complete payment (credit card or crypto)
- Credits never expire!
Configure TypingMind with OpenRouter API Key
Method 1: Direct Import (Recommended)
- Open TypingMind in your browser
- Click the "Settings" icon (gear symbol)
- Navigate to "Manage Models" section
- Click "Add Custom Model"
- Select "Import OpenRouter" from the options
- Enter your OpenRouter API key from Step 1
- Click "Check API Key" to verify the connection
- Choose which models you want to add from the list (you can add multiple at once)
- Click "Import Models" to complete the setup
Method 2: Manual Custom Model Setup
- Open TypingMind in your browser
- Click the "Settings" icon (gear symbol)
- Navigate to "Models" section
- Click "Add Custom Model"
- Fill in the model information:Name:
google/gemini-3.1-pro-preview-customtools via OpenRouter(or your preferred name)Endpoint:https://openrouter.ai/api/v1/chat/completionsModel ID:google/gemini-3.1-pro-preview-customtoolsContext Length: Enter the model's context window (e.g., 1048576 for google/gemini-3.1-pro-preview-customtools)
google/gemini-3.1-pro-preview-customtoolshttps://openrouter.ai/api/v1/chat/completionsgoogle/gemini-3.1-pro-preview-customtools via OpenRouterhttps://www.typingmind.com/model-logo.webp1048576 - Add custom headers by clicking "Add Custom Headers" in the Advanced Settings section:Authorization:
Bearer <OPENROUTER_API_KEY>:X-Title:typingmind.comHTTP-Referer:https://www.typingmind.com - Enable "Support Plugins (via OpenAI Functions)" if the model supports the "functions" or "tool_calls" parameter, or enable "Support OpenAI Vision" if the model supports vision.
- Click "Test" to verify the configuration
- If you see "Nice, the endpoint is working!", click "Add Model"
Start chatting with google/gemini-3.1-pro-preview-customtools
Now you can start chatting with the google/gemini-3.1-pro-preview-customtools model via OpenRouter on TypingMind:
- Select your preferred google/gemini-3.1-pro-preview-customtools model from the model dropdown menu
- Start typing your message in the chat input
- Enjoy faster responses and better features than the official interface
- Switch between different AI models as needed
google/gemini-3.1-pro-preview-customtoolsPro tips for better results:
- Use specific, detailed prompts for better responses (How to use Prompt Library)
- Create AI agents with custom instructions for repeated tasks (How to create AI Agents)
- Use plugins to extend google/gemini-3.1-pro-preview-customtools capabilities (How to use plugins)
- Upload documents and images directly to chat for AI analysis and discussion (Chat with documents)
Why TypingMind + OpenRouter?
- Best-in-class UI: TypingMind's interface is far superior to standard chat UIs
- Model flexibility: Switch between Google: Gemini 3.1 Pro Preview Custom Tools and 200+ models instantly
- Cost control: Pay only for what you use through OpenRouter
- One-time purchase: Buy TypingMind once, use forever with any OpenRouter model
- Data privacy: Your conversations stored locally, not on external servers
Frequently Asked Questions
Do I need a subscription to use Google: Gemini 3.1 Pro Preview Custom Tools?
No! Through OpenRouter, you pay only for what you use with no monthly subscription. Add credits to your OpenRouter account and they never expire. TypingMind is also a one-time purchase, not a subscription.
How much will it cost to use Google: Gemini 3.1 Pro Preview Custom Tools?
It costs 0.002 for input and 0.012 for output via OpenRouter. A typical conversation might cost $0.01-0.10 depending on length. Start with $5-10 in credits to test.
Can I use other models besides Google: Gemini 3.1 Pro Preview Custom Tools?
Yes! With OpenRouter + TypingMind, you get access to 200+ models including GPT-4, Claude, Gemini, Llama, Mistral, and many more. Switch between them instantly in TypingMind.
Is my data private and secure?
Yes! TypingMind stores conversations locally (web version in browser, desktop version on your device). OpenRouter handles API calls securely and doesn't train on your data. Check each provider's data policy for specifics.
Can I use Google: Gemini 3.1 Pro Preview Custom Tools for commercial projects?
Yes! Check Google's terms of service for specific commercial use policies. OpenRouter and TypingMind both support commercial use.
What if Google: Gemini 3.1 Pro Preview Custom Tools is unavailable?
OpenRouter allows you to configure fallback models. If Google: Gemini 3.1 Pro Preview Custom Tools is down, it can automatically route to your backup choice. You can also manually switch models in TypingMind anytime.
How do I cancel or get a refund?
OpenRouter: No subscriptions to cancel. Unused credits remain in your account forever.
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