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Gemini 3.1 Pro Preview (Custom Tools) API Price
Google · gemini-3.1-pro-preview-customtools
| Billing | USD · 1M tokens |
|---|---|
| Context Window | 200K tokens |
| Modalities | Text / Image / Video / Audio |
| Deep Thinking | Supported |
| Batch API | 50% off (input $1 / output $6) |
| Verified Date | 2026-10-10 |
| Official pricing page | ai.google.dev/gemini-api/docs/pricing ↗ |
Source text: the note below is the model's official text, kept in its original Chinese and not translated.
Custom Tools endpoint variant of Gemini 3.1 Pro Preview. Prompts up to 200k tokens. Caching storage: $4.50/1M tokens/hour.
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Monthly Cost Estimate
30 days · no cache hits · list price
Free quotas, tiered pricing, batch discounts, and time-based pricing are not included; refer to official bills.
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FAQ
How much does the Gemini 3.1 Pro Preview (Custom Tools) API cost?
Input $2/1M tokens, output $12/1M tokens
How large is the Gemini 3.1 Pro Preview (Custom Tools) context window?
200K tokens. Handles long documents, multi-turn conversations and large-scale inputs.
Which input modalities does Gemini 3.1 Pro Preview (Custom Tools) support?
Text / Image / Video / Audio. Supports deep thinking / reasoning.
Does Gemini 3.1 Pro Preview (Custom Tools) offer Batch API discounts?
Yes. The Batch API gets 50% off — input $1/1M tokens, output $6/1M tokens. Suited to non-realtime, asynchronous workloads.
What is the approximate monthly cost of Gemini 3.1 Pro Preview (Custom Tools)?
Depends on volume: light use (1M input + 300K output per day) ≈ $168/month; medium (5M + 1.5M) ≈ $840/month; heavy agents (10M + 3M) ≈ $1,680/month. Cache hits, batch discounts and tiered pricing can lower this further.
How does Gemini 3.1 Pro Preview (Custom Tools) compare with peers on value?
Google Gemini 3.1 Pro Preview (Custom Tools) is priced low among comparable models; compare against GPT-4o, Claude 3.5 and Gemini 2.5. See the Pricemon market table for a full comparison.
What use cases suit Gemini 3.1 Pro Preview (Custom Tools)?
Good for: chat systems, customer support, content generation, coding assistance, data analysis.The long context supports deep-analysis scenarios.
Does Gemini 3.1 Pro Preview (Custom Tools) have a free tier?
Check Google's official pricing page for the latest free quota, trial policy and tiered pricing. Policies differ by vendor and change over time.