# Gemini 3.1 Pro Preview Custom Tools API pricing

The official API price of Gemini 3.1 Pro Preview Custom Tools is $2 per 1M input tokens and $12 per 1M output tokens (as of 2026-11-12). Context window: 1.05M tokens, up to 65.5K output tokens per request. 12 providers sell it, none below the official price.

- Type: Text
- Context: 1.05M
- Max output: 65.5K
- Released: 2026-02-19
- Open weights: No

## Price by provider (USD per 1M tokens)

| Provider | Model id | Input | Output | Cached | Notes |
| --- | --- | --- | --- | --- | --- |
| [Google](https://ai.google.dev/gemini-api/docs/models) | gemini-3.1-pro-preview-customtools | $2 | $12 | $0.2 | Official, Tiered pricing |
| [AIHubMix](https://docs.aihubmix.com) | gemini-3.1-pro-preview-customtools | $2 | $12 | $0.2 | Tiered pricing |
| [Eden AI](https://docs.edenai.co) | google/gemini-3.1-pro-preview-customtools | $2 | $12 | $0.2 | Tiered pricing |
| [Vertex](https://cloud.google.com/vertex-ai/generative-ai/docs/models) | gemini-3.1-pro-preview-customtools | $2 | $12 | $0.2 | Tiered pricing, Beta |
| [Kilo Gateway](https://kilo.ai) | google/gemini-3.1-pro-preview-customtools | $2 | $12 | $0.2 |  |
| [Merge Gateway](https://docs.merge.dev/merge-gateway) | google/gemini-3.1-pro-preview-customtools | $2 | $12 | $0.2 | Tiered pricing |
| [NanoGPT](https://docs.nano-gpt.com) | google/gemini-3.1-pro-preview-customtools | $2 | $12 | $0.2 |  |
| [Neon](https://neon.com/docs) | gemini-3-1-pro | $2 | $12 | $0.2 | Tiered pricing |
| [OpenRouter](https://openrouter.ai/models) | google/gemini-3.1-pro-preview-customtools | $2 | $12 | $0.2 | Tiered pricing |
| [Tempr Gateway](https://temprhq.io/docs/gateway-reference.html) | google/gemini-3.1-pro-preview-customtools | $2 | $12 | $0.2 | Tiered pricing |
| [AI/ML API](https://docs.aimlapi.com) | google/gemini-3.1-pro-preview-customtools | $2.116 | $12.696 | $0.2116 |  |
| [OrcaRouter](https://docs.orcarouter.ai) | google/gemini-3.1-pro-preview-customtools | $4 | $18 | $0.4 |  |

Providers are those listed by models.dev. This site has not vetted them one by one; each provider's own page has the binding price.

Prices and specs come from models.dev (MIT licence), updated 2026-11-12. Each provider's name links to its official docs. A provider priced at 0 usually includes the model in a subscription; it is not necessarily a free API.

https://apibook.ai/models/google/gemini-3.1-pro-preview-customtools/