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

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 number of completion tokens to generate. Default: `4096`
`temperature`	number	No	Sampling temperature for the response. Allowed values: `0`, `0.5`, `1`, `2` Default: `1`
`stream`	boolean	No	Return tokens incrementally when enabled. Allowed values: `true`, `false` Default: `false`

Request example

cURL

curl 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

const response = await fetch("https://aihub-admin.aimix.pro/api-platform/v1/chat/completions", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.PIXMIND_API_KEY}`,
    "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
})
});

const task = await response.json();

Accepted task response

Generation is asynchronous. Save taskId and poll GET /api-platform/v1/tasks/{taskId} until status is ready or failed.

200 OK

{
  "code": 1000,
  "data": {
    "id": "img_44160",
    "taskId": 44160,
    "type": "image",
    "model": "gemini-3.1-pro-preview",
    "status": "processing"
  }
}

API pricing

Configuration	Price
Input tokens	1911 credits / 1M tokens
Output tokens	11466 credits / 1M tokens
Cache read	254.8 credits / 1M tokens

API pricing uses the apiPlatform role and is separate from PixMind Studio credits. The accepted task response is the final pricing snapshot.