gemini-3-pro-image-preview (Chat format)

POST

/chat/completions

The latest image generation model from Google’s Gemini series. It supports both text-to-image and image-to-image generation; you only need to pass the image URL via image_url.

Supported models:

gemini-2.5-flash-image-preview

gemini-2.5-flash-image

gemini-3-pro-image-preview

Note:
1.
We have modified the API format to be compatible with the OpenAI API format, and the response format is Markdown. This model does not support streaming.
2.
This model will automatically perform contextual image editing based on the conversation history passed in.

For pricing, please refer to: https://302.ai/price

Request

Header Params

Body Params application/json

Example

{
    "model": "gemini-3-pro-image-preview",
    "stream": false,
    "messages": [
        {
            "role": "user",
            "content": [
                {
                    "type": "text",
                    "text": "Change this image to a real-life version."
                },
                {
                    "type": "image_url",
                    "image_url": {
                        "url": "https://s2.loli.net/2024/02/01/QSWVdw9bX56gj7O.jpg"
                    }
                }
            ]
        }
    ]
}

Request Code Samples

Shell

JavaScript

Java

Swift

PHP

Python

HTTP

Objective-C

Ruby

OCaml

Dart

curl --location --request POST 'https://api.302.ai/chat/completions' \
--header 'Accept: application/json' \
--header 'Authorization: Bearer ' \
--header 'Content-Type: application/json' \
--data-raw '{
    "model": "gemini-3-pro-image-preview",
    "stream": false,
    "messages": [
        {
            "role": "user",
            "content": [
                {
                    "type": "text",
                    "text": "Change this image to a real-life version."
                },
                {
                    "type": "image_url",
                    "image_url": {
                        "url": "https://s2.loli.net/2024/02/01/QSWVdw9bX56gj7O.jpg"
                    }
                }
            ]
        }
    ]
}'

Responses

🟢200OK

application/json

Body

Example

{
    "id": "chatcmpl-123",
    "object": "chat.completion",
    "created": 1677652288,
    "choices": [
        {
            "index": 0,
            "message": {
                "role": "assistant",
                "content": "\n\nHello there, how may I assist you today?"
            },
            "finish_reason": "stop"
        }
    ],
    "usage": {
        "prompt_tokens": 9,
        "completion_tokens": 12,
        "total_tokens": 21
    }
}

Modified at 2025-11-21 08:40:49

gemini-3-pro-image-preview (Original Format - Image Editing)

gemini-3-pro-image-preview (pay-per-use - text-to-image)