POST
/
v1
/
chat
/
completions
Chat Compatible Vision
curl --request POST \
  --url https://api.example.com/v1/chat/completions \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "<string>",
  "messages": [
    {}
  ],
  "temperature": 123,
  "max_tokens": 123,
  "stream": true
}
'
{
  "id": "<string>",
  "object": "<string>",
  "created": 123,
  "model": "<string>",
  "choices": [
    {}
  ],
  "usage": {}
}
Official documentation: https://ai.google.dev/gemini-api/docs/image-understanding
Analyze and understand images using Gemini models through the standard OpenAI Chat Completions API format.

​
Overview

This endpoint allows you to send images to Gemini models for analysis using the OpenAI-compatible chat format. You can provide images via URL or base64-encoded data.

​
Authentication

All requests require a Bearer token in the Authorization header: 
Authorization: Bearer YOUR_API_KEY

​
Request Parameters

​
model
string
required
The Gemini model ID. For example: gemini-1.5-pro-latest, gemini-2.5-pro.
​
messages
array
required
A list of messages with multimodal content. Include image_url objects for images.
​
temperature
number
default:"1"
Sampling temperature between 0 and 2.
​
max_tokens
integer
Maximum number of tokens to generate.
​
stream
boolean
default:"false"
Whether to stream responses.

​
Request Example

curl -X POST https://www.anyfast.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-1.5-pro-latest",
    "stream": false,
    "messages": [
      {
        "role": "user",
        "content": [
          {"type": "text", "text": "What is in this image?"},
          {"type": "image_url", "image_url": {"url": "https://example.com/image.png"}}
        ]
      }
    ],
    "temperature": 0.9,
    "max_tokens": 400
  }'

​
Response Example

{
  "id": "chatcmpl-gemini-vision-123",
  "object": "chat.completion",
  "created": 1677652288,
  "model": "gemini-1.5-pro-latest",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "The image shows a logo featuring a cat character..."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 300,
    "completion_tokens": 50,
    "total_tokens": 350
  }
}

​
Response Fields

​
id
string
Unique identifier for the completion.
​
object
string
Object type, which is chat.completion.
​
created
integer
Unix timestamp of when the completion was created.
​
model
string
The model used.
​
choices
array
List of completion choices.
​
usage
object
Usage statistics for the request.

​
Image Input Formats

Images can be provided in two ways:

​
URL

{"type": "image_url", "image_url": {"url": "https://example.com/image.png"}}

​
Base64

{"type": "image_url", "image_url": {"url": "data:image/png;base64,<BASE64_DATA>"}}

​
Available Models

  • gemini-1.5-pro-latest
  • gemini-2.0-flash
  • gemini-2.5-pro
  • gemini-2.5-flash