AiGanakGemini 3.1 Pro (preview) API pricing
Gemini 3.1 Pro (preview) costs $2 per million input tokens and $12 per million output tokens at Google's standard list price, checked 26 October 2026. One typical support answer costs about $0.011.
Gemini 3.1 Pro (preview) (Google) costs $2 input, $0.2 cached input and $12 output per million tokens at standard list price, checked 26 October 2026. Batch: $1 input and $6 output. A typical support answer costs $0.011.
Gemini 3.1 Pro (preview) price per million tokens
Model ID gemini-3.1-pro-preview. Source: Google's pricing page, checked 26 October 2026. AiGanak re-checks every price weekly.
| Standard | Batch | |
|---|---|---|
| Input | $2 | $1 |
| Cached input | $0.2 | $0.2 |
| Output | $12 | $6 |
- Prompts over 200K tokens pay higher rates. Long-prompt rates: $4 input, $18 output.
- Batch requests return within 24 hours at the batch rate.
- Preview.
What Gemini 3.1 Pro (preview) costs per request
Token counts are stated so you can check the arithmetic.
| Task | Tokens | Per request | Per 1,000 | $100 buys |
|---|---|---|---|---|
| Chat reply | 2,000 input tokens, none cached, 300-token reply | $0.00760 | $7.60 | 13,157 |
| Support answer | 6,000 input tokens (4,000 cached instructions and help text), 500-token answer | $0.011 | $10.80 | 9,259 |
| Document summary | 20,000-token document, no caching, 800-token summary | $0.050 | $49.60 | 2,016 |
Gemini 3.1 Pro (preview) compared with similar models
Cost of the same support answer (6,000 input tokens (4,000 cached instructions and help text), 500-token answer). Cheaper is not better unless quality holds on your own examples.
| Model | Input / output per 1M | Support answer | vs Gemini 3.1 Pro (preview) |
|---|---|---|---|
| Gemini 4 Argon | $2 / $10 | $0.00940 | 13% cheaper |
| Gemini 3.1 Pro (preview) | $2 / $12 | $0.011 | — |
| Claude Opus 5.5 | $4 / $20 | $0.019 | 74% dearer |
| Claude Fable 5.1 | $10 / $50 | $0.046 | 326% dearer |
| GPT-6 Astra | $10 / $50 | $0.049 | 354% dearer |
See every model on one page in the LLM Price Index, or upload your bill to the free LLM Bill Analyzer to see what Gemini 3.1 Pro (preview) costs you and what you could save.
Gemini 3.1 Pro (preview) pricing questions
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How much does Gemini 3.1 Pro (preview) cost per million tokens?
Gemini 3.1 Pro (preview) costs $2 input, $0.2 cached input and $12 output per million tokens at Google's standard list price, checked 26 October 2026. Batch processing costs $1 input and $6 output per million tokens. Prompts over 200K tokens pay higher rates.
How much does one request cost on Gemini 3.1 Pro (preview)?
A support answer with 6,000 input tokens (4,000 of them cached) and a 500-token reply costs about $0.011, or $10.80 per 1,000 answers, at standard list prices.
Is Gemini 3.1 Pro (preview) getting more expensive?
No price change was announced on Google's pricing page when AiGanak checked it on 26 October 2026. AiGanak re-checks prices weekly and emails alerts when one changes.
What is a cheaper alternative to Gemini 3.1 Pro (preview)?
Among flagship models from OpenAI, Anthropic and Google, Gemini 4 Argon is the cheapest for the same support answer at $0.00940 per request, against $0.011 on Gemini 3.1 Pro (preview). Test quality on your own examples before switching.
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