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POST
/
v1beta
/
models
/
{model}
:generateContent
import os
from google import genai
from google.genai import types
import os

client = genai.Client(
    http_options={"api_version": "v1beta", "base_url": "https://api.cometapi.com"},
    api_key=os.environ.get("COMETAPI_KEY"),
)

response = client.models.generate_content(
    model="gemini-3.1-flash-image-preview",
    contents="A Monarch butterfly anatomical sketch on textured parchment",
    config=types.GenerateContentConfig(
        response_modalities=["TEXT", "IMAGE"],
        image_config=types.ImageConfig(aspect_ratio="1:1", image_size="4K"),
    ),
)

for part in response.parts:
    if part.text:
        print(part.text)
    elif image := part.as_image():
        image.save("output.png")
{
  "candidates": [
    {
      "content": {
        "role": "<string>",
        "parts": [
          {
            "text": "<string>",
            "inlineData": {
              "mimeType": "<string>",
              "data": "<string>"
            }
          }
        ]
      },
      "index": 123,
      "safetyRatings": [
        {
          "category": "<string>",
          "probability": "<string>"
        }
      ]
    }
  ],
  "usageMetadata": {
    "promptTokenCount": 123,
    "candidatesTokenCount": 123,
    "totalTokenCount": 123,
    "thoughtsTokenCount": 123
  }
}
For step-by-step code examples (text-to-image, image-to-image, multi-image composition, chat editing), see Gemini Image Generation Guide.
gemini-2.5-flash-image is scheduled for shutdown by the provider on 2026-10-02. For new projects, use gemini-3.1-flash-image-preview or gemini-3-pro-image-preview. See Google’s deprecation schedule for details.

Authorizations

​
Authorization
string
header
required

Use your CometAPI API key.

Path Parameters

​
model
string
default:gemini-3.1-flash-image-preview
required

The Gemini image model to use. See the Models page for current options.

Body

application/json
​
contents
object[]
required

Conversation turns. Each item has a role ("user" or "model") and parts array containing text and/or image data.

​
generationConfig
object

Controls generation behavior — output modalities, image resolution, thinking, etc.

​
tools
object[]

Optional tools. Pass [{"google_search": {}}] to enable Google Search grounding for real-time information in generated images.

Response

200 - application/json

Success

​
candidates
object[]
​
usageMetadata
object