Gemini 3.1 Pro Preview Custom Tools API pricing
As of October 22, 2026, Google Gemini 3.1 Pro Preview Custom Tools costs $2.00 per million input tokens and $12.00 per million output tokens on Google's own API, with cached input at $0.20 per million.
Gemini 3.1 Pro Preview Custom Tools benchmarks and specs · Every Google model's price
- Input, per million tokens$2.00
- Output, per million tokens$12.00
- Cached input, per million$0.20
- Context window1.05M tokens
- Max output66K tokens
- Output speedNot measured
What a request costs
Three fixed token mixes at the list price, without cache or batch discounts. For a whole month, use the calculator.
| Workload | Tokens | One request | 1,000 requests | Fits the context window |
|---|---|---|---|---|
| Chat turn | 1K input + 500 output tokens | $0.0080 | $8.00 | Yes |
| Repository review | 50K input + 3K output tokens | $0.136 | $136.00 | Yes |
| Agent loop | 200K input + 10K output tokens | $0.520 | $520.00 | Yes |
| Solved coding task | One SWE-bench Verified attempt, divided by the share that succeed | Not computable | Not computable |
Price history
We have read Google's own price every day since October 21, 2026. It has not changed yet; any change will be listed here with its date.
- October 21, 2026 First recorded: $2.00 input, $12.00 output
Cheaper models as good as Gemini 3.1 Pro Preview Custom Tools
Gemini 3.1 Pro Preview Custom Tools has no overall or coding score, so we make no quality claim against it.
Gemini 3.1 Pro Preview Custom Tools pricing questions
- How much does Gemini 3.1 Pro Preview Custom Tools cost per million tokens?
- $2.00 per million input tokens and $12.00 per million output tokens, as listed on OpenRouter on October 22, 2026.
- Does Gemini 3.1 Pro Preview Custom Tools support prompt caching?
- Yes. OpenRouter lists cached input at $0.20 per million tokens, against $2.00 for uncached input.
- Has the price of Gemini 3.1 Pro Preview Custom Tools changed?
- Not since we started recording it daily on October 21, 2026.