Chat-to-image/Edit nano-banana

Overview

• Method: POST
• Path: /v1/chat/completions

Authentication

• Use HTTP Bearer Token, e.g.: Authorization: Bearer sk-xxxxx

---

Request Parameters

Parameter	Type	Required	Description
model	string	Yes	Model selection: nano-banana / gemini-2.5-flash-image etc.
messages	array	Yes	Array of role messages, supports text and image_url
stream	boolean	No	Stream output or not

---

Request Example

{
  "model": "nano-banana",
  "messages": [
    {
      "role": "user",
      "content": [
        {"type": "text", "text": "Draw a colorful artwork, theme optional."}
      ]
    }
  ]
}

---

Response Example

{
  "id": "abc123",
  "model": "nano-banana",
  "object": "chat.completion",
  "created": 1725000000,
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": [{"type": "text", "text": "Generation completed"}]
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 10,
    "completion_tokens": 20,
    "total_tokens": 30,
    "prompt_tokens_details": {"text_tokens": 7, "image_tokens": 3},
    "completion_tokens_details": {"image_tokens": 20}
  }
}