What is the context window of Google: Gemini 3.1 Pro Preview?

Google: Gemini 3.1 Pro Preview supports a context window of 1.0M tokens.

Is Google: Gemini 3.1 Pro Preview free to use?

Google: Gemini 3.1 Pro Preview is a paid model. It costs $2.00 per million input tokens and $12.00 per million output tokens.

How is LLM API pricing calculated?

LLM pricing has two components: input tokens (everything you send) and output tokens (what the model generates). Total cost = (prompt tokens × input rate + output tokens × output rate) / 1,000,000 × number of requests.

Google: Gemini 3.1 Pro Preview API Pricing — $2.00 Input / $12.00 Output per 1M Tokens

Q: How much does Google: Gemini 3.1 Pro Preview cost?

Google: Gemini 3.1 Pro Preview costs $2.00 per million input tokens and $12.00 per million output tokens via OpenRouter. Pricing was last updated Oct 29, 2026.

Google: Gemini 3.1 Pro Preview by Google — $2.00 input / $12.00 output per 1M tokens via OpenRouter. Context: 1.0M tokens. Pricing last updated Oct 29, 2026.

Input / 1M tokens

$2.00

Output / 1M tokens

$12.00

Provider

Google

Context window

1.0M tokens

Via

OpenRouter

Cost at common usage volumes

Usage	Daily	Monthly
Chatbot (100/day)	$1.60	$48.00
Small app (1K/day)	$8.00	$240.00
Mid-scale (10K/day)	$100.00	$3000.00
Large scale (100K/day)	$2200.00	$66000.00

Model ID: google/gemini-3.1-pro-preview
Data source: OpenRouter public API — updated Oct 29, 2026.

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About Google: Gemini 3.1 Pro Preview

Google: Gemini 3.1 Pro Preview is an LLM developed by Google. Input costs $2.00 per million tokens and output costs $12.00 per million tokens via OpenRouter. It supports a context window of 1.0M tokens.

Pricing Details

Via the OpenRouter API:

Input tokens: $2.00 per 1 million tokens
Output tokens: $12.00 per 1 million tokens

A token is roughly 0.75 words. For context: a typical user message of 100 words is approximately 133 tokens; a 500-word system prompt is about 650 tokens.

How Much Does Google: Gemini 3.1 Pro Preview Cost?

For a typical chatbot application (1,000 requests/day, 1,000 prompt tokens and 500 output tokens per request):

Daily cost: $8.0000
Monthly cost: $240.000

Accessing Google: Gemini 3.1 Pro Preview via OpenRouter

OpenRouter provides a unified API for 200+ LLMs including Google: Gemini 3.1 Pro Preview. You can use it with any OpenAI-compatible SDK by setting the base URL to https://openrouter.ai/api/v1 and using your OpenRouter API key. The model ID is google/gemini-3.1-pro-preview.

Compare Google: Gemini 3.1 Pro Preview with Other Models

Use the AI Model Cost Comparison tool to compare Google: Gemini 3.1 Pro Preview against GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, or any other model side by side. Or use the LLM API Cost Calculator to browse all 456+ models sorted by cost for your specific usage.

Frequently Asked Questions

Yes. Google: Gemini 3.1 Pro Preview is available on OpenRouter with the model ID google/gemini-3.1-pro-preview. OpenRouter provides a unified API compatible with OpenAI's SDK format.