Merge Landing Page

Gemini 3.1 Pro Preview Customtools:
Everything you need to know about the model

Gemini 3.1 Pro Preview Customtools is a Google model available through Merge Gateway via Google. Use it with Gateway routing policies, spend controls, request logs, and a 1,048,576 token context window. It supports streaming, structured outputs, tool calling, vision through at least one Gateway vendor route.

Gemini 3.1 Pro Preview Customtools pricing

| Vendor | Input / 1M tokens | Output / 1M tokens | Zero data retention | | --- | ---: | ---: | --- | | Google | $2.00 | $12.00 | No |

Test Gemini 3.1 Pro Preview Customtools with Merge Gateway’s Simulator

Gemini 3.1 Pro Preview Customtools

Model

System prompt

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User message

Synced

Response

Run simulation to see response

Cost

—

Tokens

—

Latency

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Route requests to Gemini 3.1 Pro Preview Customtools with Merge Gateway

Merge Gateway is a unified LLM API that lets your product route requests to Gemini 3.1 Pro Preview Customtools and every other major model through a single endpoint. You get built-in fallback routing, per-request cost tracking, zero data retention support, and observability without changing your application architecture.

To get started in seconds, add our Gateway Implementation skill to your project, or pick your preferred SDK below. Check out our other quick start skills here.

Install the Merge Gateway SDK

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Make your first API call

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Try a diffrent model

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Install the Merge Gateway SDK

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Make your first API call

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Try a diffrent model

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Install the Merge Gateway SDK

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Make your first API call

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Try a diffrent model

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Install the Merge Gateway SDK

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Make your first API call

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

Try a diffrent model

Python

1{
2  "mcpServers": {
3    "agent-handler": {
4      "url": "https://ah-api-develop.merge.dev/api/v1/tool-packs/{TOOL_PACK_ID}/registered-users/{REGISTERED_USER_ID}/mcp",
5      "headers": {
6        "Authorization": "Bearer yMt*****"
7      }
8    }
9  }
10}
11

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Gemini 3.1 Pro Preview Customtools FAQ

In case you have any more questions on using Gemini 3.1 Pro Preview Customtools, we’ve addressed several below.

Heading

What provider owns Gemini 3.1 Pro Preview Customtools?

Gemini 3.1 Pro Preview Customtools is a Google model.

Which vendors can run Gemini 3.1 Pro Preview Customtools?

Google is the default listed vendor, and other active vendors may also be available.

What context window does Gemini 3.1 Pro Preview Customtools support?

Gemini 3.1 Pro Preview Customtools supports 1,048,576 tokens on the primary listed vendor route.

What capabilities does Gemini 3.1 Pro Preview Customtools support?

Gateway currently lists streaming, structured outputs, tool calling, vision support for Gemini 3.1 Pro Preview Customtools across its available vendor routes.

Try Gemini 3.1 Pro Preview Customtools through Merge Gateway

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