Question 1

What is Gemini 3.1 Pro Preview Custom Tools?

Accepted Answer

Gemini 3.1 Pro Preview Custom Tools is a model from Google Gemini AI, released on Feb 19, 2026. Gemini 3 1 Pro is a Google Gemini model for multimodal reasoning, coding, generation, and long-context tasks.

Question 2

How much does Gemini 3.1 Pro Preview Custom Tools cost?

Accepted Answer

On the Respan gateway, input starts at $2.00 per 1M tokens on every provider, and output starts at $12.00 per 1M tokens on every provider, after gateway discounts.

Question 3

Which providers serve Gemini 3.1 Pro Preview Custom Tools on Respan?

Accepted Answer

2 providers serve Gemini 3.1 Pro Preview Custom Tools: Google Gemini AI and OpenRouter.

Question 4

What is Gemini 3.1 Pro Preview Custom Tools's context window?

Accepted Answer

Gemini 3.1 Pro Preview Custom Tools accepts up to 1.0M tokens of context on its largest provider route.

Question 5

How do I use Gemini 3.1 Pro Preview Custom Tools with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "gemini/gemini-3.1-pro-preview-customtools". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is Gemini 3.1 Pro Preview Custom Tools?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was Google Gemini AI at 30 tokens per second, and the lowest response latency was 2.0 seconds on Google Gemini AI. Speed varies with request size and provider.

Provider	Context	Input	Output	Capabilities
Google Gemini AI`gemini/gemini-3.1-pro-preview-customtools`	1.0M	$2.00/M	$12.00/M
OpenRouter`openrouter/google/gemini-3.1-pro-preview-customtools`	1.0M	$2.00/M	$12.00/M

Gemini 3.1 Pro Preview Custom Tools

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Apps