Gemini 3.1 Pro Preview Custom Tools API Pricing
Google · released Feb 19, 2026 · 1.05M context · API model ID gemini-3.1-pro-preview-customtools
Gemini 3.1 Pro Preview Custom Tools by Google API pricing: $2.00 per 1M input tokens and $12.00 per 1M output tokens (verified against the official pricing page, Oct 9, 2026).
Prices
| Price | USD per 1M tokens |
|---|---|
| Input | $2.00 |
| Output | $12.00 |
| Cache read | $0.20 |
| Cache write | Not published |
| Batch input | $1.00 |
| Batch output | $6.00 |
Verified against the provider's official pricing page on Oct 9, 2026. Official pricing page
Estimated monthly cost
$2,400
per month
- per day
- $80.00
- per request
- $0.008
Cannot estimate: a needed price is not published.
Cost = input tokens × input price + output tokens × output price, 30 days a month. Cached input uses the cache read price. Cache write fees are not included.
Long-context prices
Prompts longer than the threshold are billed at a higher rate.
| Prompts over | Input | Output | Cache read | Cache write |
|---|---|---|---|---|
| 200,000 tokens | $4.00 | $18.00 | $0.40 | Not published |
Monthly cost by workload
| Workload | Per month |
|---|---|
| Chatbot1,000 in / 500 out tokens, 10,000 requests a day | $2,400/mo |
| RAG8,000 in / 500 out tokens, 5,000 requests a day | $3,300/mo |
| Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input | $1,560/mo |
Context and capabilities
- Context
- 1,048,576 tokens
- Max output
- 65,536 tokens
- Input
- text, image, video, audio, pdf
- Output
- text
- Knowledge cutoff
- January 2025
- Open weights
- No
- Tool calling
- Yes
- Reasoning
- Yes
- Structured outputs
- Yes
Capabilities and limits as listed by models.dev.
Similarly priced models
- Gemini 3.1 Pro Preview · $2.00 in / $12.00 out
- Claude Sonnet 5.5 · $2.00 in / $10.00 out
- GPT-6.1 Sol · $2.00 in / $10.00 out
- Kimi K3 · $3.00 in / $15.00 out
Price history
No price changes since we started tracking on Oct 8, 2026.
Questions
- How much does Gemini 3.1 Pro Preview Custom Tools cost per month?
- For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, Gemini 3.1 Pro Preview Custom Tools costs about $2,400 per month at the provider's official prices (verified) ($2.00 per 1M input tokens, $12.00 per 1M output tokens).
- Does Gemini 3.1 Pro Preview Custom Tools support prompt caching?
- Yes. Cached input costs $0.20 per 1M tokens, compared with $2.00 for regular input.
- How long is Gemini 3.1 Pro Preview Custom Tools's context window?
- Gemini 3.1 Pro Preview Custom Tools accepts up to 1,048,576 tokens (1.05M) of context and returns up to 65,536 tokens per response.
- Does Gemini 3.1 Pro Preview Custom Tools have a batch price?
- Yes. Asynchronous batch requests cost $1.00 per 1M input tokens and $6.00 per 1M output tokens.