Gemini 3.1 Pro Preview Custom Tools
by Google · google/gemini-3.1-pro-preview-customtools · #277 cheapest of 325 paid models
Prices updated Jul 22, 2026, 2:49 AM UTC · refreshed hourly
Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...
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Pricing
Input
$2.00
per 1M tokens
Output
$12.00
per 1M tokens
Blended (3:1)
$4.50
3 input : 1 output
Cache read
$0.20
per 1M cached tokens
Cache write
$0.375
per 1M tokens
Cache & batch economics
Effective prices for Gemini 3.1 Pro Preview Custom Tools with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $4.50 | $0.216 | — |
| 50% | $3.83 | $0.126 | −42% |
| 90% | $3.29 | $0.054 | −75% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates for this provider’s batch API. Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.0046 | $4.60 |
| Document summary | 8,000 | 1,000 | $0.028 | $28.00 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.084 | $84.00 |
| Long-context analysis | 150,000 | 5,000 | $0.36 | $360.00 |
Specs
Context window
1.05M
tokens
Max output
66K
tokens
Input modalities
text, audio, image, video, file
Tokenizer
Gemini