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Google: Gemini 3.1 Pro Preview API Pricing
Google: Gemini 3.1 Pro Preview costs $2.00 per 1M input tokens and $12.00 per 1M output tokens (cache reads: $0.200). Context window: 1.0M. Prices verified 2026-08-23 · source
Input / 1M tokens
$2.00
Output / 1M tokens
$12.00
Context window
1.0M
Max output
66K
What would Google: Gemini 3.1 Pro Preview cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $64.00 |
| Coding agent | 5,000 | 8,000 / 2,000 | $200.00 |
| RAG pipeline | 30,000 | 4,000 / 500 | $420.00 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $104.00 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About Google: Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation...
Compare Google: Gemini 3.1 Pro Preview with
Official resources
- Google: Gemini 3.1 Pro Preview on OpenRouter — live endpoint, pricing source of record.
- Get an OpenRouter API key → — one key, every model including Preview. Free credits on signup.
- Shred your current bill — paste a CSV and see if switching saves money.