Gemini 3.1 Pro Preview Chat Completions

Call Gemini 3.1 Pro Preview through PixMind for text, image and video understanding, reasoning, tools, and streaming.

Gemini 3.1 Pro Preview is available through PixMind's OpenAI-compatible chat completions endpoint for multimodal agent workflows and complex reasoning.

Gemini 3.1 Pro Preview through PixMind's OpenAI-compatible chat completions endpoint.

Provider

Google

Model ID

gemini-3.1-pro-preview

Endpoint

POST /api-platform/v1/chat/completions

Open model playground Create API key

Authentication

Base URL: https://aihub-admin.aimix.pro. Send Authorization: Bearer <PIXMIND_API_KEY> on both creation and polling requests, and Content-Type: application/json when submitting JSON. Keep your key in a server environment variable.

Model notes

Keep the API key on your server and use streaming when the client needs incremental output.
Gemini accepts up to 10 images (10MB each) and one video (20MB) per request. Media URLs must use HTTPS.

Request parameters

Parameter	Type	Required	Description
`model`	string	Yes	Stable PixMind model ID. Use `gemini-3.1-pro-preview`. Allowed values: `gemini-3.1-pro-preview`
`messages`	array	Yes	OpenAI-compatible chat messages. Gemini user content may be a string or an array of text, image_url, and video_url blocks.
`max_tokens`	integer	No	Maximum completion tokens; send a positive integer. The default and upper limit depend on the selected model. Playground default: `4096`
`temperature`	number	No	Sampling temperature, a number from 0 to 2 where supported. Default: `1`
`stream`	boolean	No	Return tokens incrementally when enabled. Allowed values: `true`, `false` Default: `false`

Request example

cURL

curl --request POST 'https://aihub-admin.aimix.pro/api-platform/v1/chat/completions' \
  -H "Authorization: Bearer $PIXMIND_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gemini-3.1-pro-preview",
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "Compare the product image with the motion in the video."
        },
        {
          "type": "image_url",
          "image_url": {
            "url": "https://example.com/product.png"
          }
        },
        {
          "type": "video_url",
          "video_url": {
            "url": "https://example.com/motion.mp4"
          }
        }
      ]
    }
  ],
  "stream": false
}'

JavaScript

// Node.js 20+. Keep the API key on your server.
const apiKey = process.env.PIXMIND_API_KEY;
if (!apiKey) throw new Error("PIXMIND_API_KEY is required");

const response = await fetch("https://aihub-admin.aimix.pro/api-platform/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${apiKey}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
  "model": "gemini-3.1-pro-preview",
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "Compare the product image with the motion in the video."
        },
        {
          "type": "image_url",
          "image_url": {
            "url": "https://example.com/product.png"
          }
        },
        {
          "type": "video_url",
          "video_url": {
            "url": "https://example.com/motion.mp4"
          }
        }
      ]
    }
  ],
  "stream": false
}),
  signal: AbortSignal.timeout(30_000)
});

const task = await response.json();
if (!response.ok) {
  throw new Error(task.message ?? task.error?.message ?? `HTTP ${response.status}`);
}
console.log(task);

Response example

Non-streaming chat completions return choices directly. With stream: true, consume the SSE stream instead.

200 OK

{
  "id": "chatcmpl_example",
  "object": "chat.completion",
  "model": "gemini-3.1-pro-preview",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hello!"
      },
      "finish_reason": "stop"
    }
  ]
}