# Gemini 2.5 Flash Image Generation

> Image Generation

Generate text and image output using the documented ModelVerse
Gemini-compatible `generateContent` endpoint. The source examples use
`generationConfig.responseModalities: ["TEXT", "IMAGE"]`; this model
does not support image-only output.

## Endpoint

`POST https://api.modelverse.cn/v1beta/models/gemini-2.5-flash-image:generateContent`

## Request Body

## Responses

- **200** — Gemini-compatible generateContent response.
- **400** — 
- **401** — 
- **default** — 

## OpenAPI Definition

```json
{
  "openapi": "3.1.0",
  "x-language": "en-US",
  "info": {
    "title": "ModelVerse gemini-2.5-flash-image Gemini-Compatible Image API",
    "version": "1.0.0",
    "description": "Self-contained OpenAPI 3.1 schema for the ModelVerse Gemini-compatible\n`gemini-2.5-flash-image` `generateContent` image generation and image\nediting API.\n"
  },
  "servers": [
    {
      "url": "https://api.modelverse.cn",
      "description": "ModelVerse API endpoint documented for this model."
    }
  ],
  "tags": [
    {
      "name": "gemini-2.5-flash-image",
      "description": "Gemini-compatible text-to-image and image editing with gemini-2.5-flash-image."
    }
  ],
  "security": [
    {
      "xGoogApiKey": []
    },
    {
      "bearerAuth": []
    }
  ],
  "paths": {
    "/v1beta/models/gemini-2.5-flash-image:generateContent": {
      "post": {
        "tags": [
          "gemini-2.5-flash-image"
        ],
        "operationId": "generateContentGemini25FlashImage",
        "summary": "Gemini 2.5 Flash Image Generation",
        "description": "Generate text and image output using the documented ModelVerse\nGemini-compatible `generateContent` endpoint. The source examples use\n`generationConfig.responseModalities: [\"TEXT\", \"IMAGE\"]`; this model\ndoes not support image-only output.\n",
        "security": [
          {
            "xGoogApiKey": []
          },
          {
            "bearerAuth": []
          }
        ],
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/Gemini25FlashImageGenerateContentRequest"
              },
              "examples": {
                "textToImage": {
                  "summary": "Source document text-to-image request",
                  "value": {
                    "contents": [
                      {
                        "role": "user",
                        "parts": [
                          {
                            "text": "Create a picture of a nano banana dish in a fancy restaurant with a Gemini theme"
                          }
                        ]
                      }
                    ],
                    "generationConfig": {
                      "responseModalities": [
                        "TEXT",
                        "IMAGE"
                      ]
                    }
                  }
                },
                "imageEditInlineData": {
                  "summary": "Source document image editing request with inline image data",
                  "value": {
                    "contents": [
                      {
                        "role": "user",
                        "parts": [
                          {
                            "text": "Convert this photo to black and white, in a cartoonish style."
                          },
                          {
                            "inlineData": {
                              "mimeType": "image/jpeg",
                              "data": "{image_base64_string}"
                            }
                          }
                        ]
                      }
                    ],
                    "generationConfig": {
                      "responseModalities": [
                        "TEXT",
                        "IMAGE"
                      ]
                    }
                  }
                },
                "imageEditFileData": {
                  "summary": "Image editing request using documented fileData",
                  "value": {
                    "contents": [
                      {
                        "role": "user",
                        "parts": [
                          {
                            "text": "Convert this photo to black and white, in a cartoonish style."
                          },
                          {
                            "fileData": {
                              "mimeType": "image/jpeg",
                              "fileUri": "https://umodelverse-inference.cn-wlcb.ufileos.com/ucloud-maxcot.jpg"
                            }
                          }
                        ]
                      }
                    ],
                    "generationConfig": {
                      "responseModalities": [
                        "TEXT",
                        "IMAGE"
                      ]
                    }
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Gemini-compatible generateContent response.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/Gemini25FlashImageGenerateContentResponse"
                },
                "examples": {
                  "documentedResponse": {
                    "summary": "Source document response with text, image data, and usage metadata",
                    "value": {
                      "candidates": [
                        {
                          "content": {
                            "parts": [
                              {
                                "text": "That sounds incredibly unique! Here's a picture of a nano banana dish in a fancy restaurant with a Gemini theme:\n\n"
                              },
                              {
                                "inlineData": {
                                  "data": "xxx",
                                  "mimeType": "image/png"
                                }
                              }
                            ],
                            "role": "model"
                          },
                          "finishReason": "STOP"
                        }
                      ],
                      "usageMetadata": {
                        "candidatesTokenCount": 1315,
                        "candidatesTokensDetails": [
                          {
                            "modality": "IMAGE",
                            "tokenCount": 1290
                          },
                          {
                            "modality": "TEXT",
                            "tokenCount": 25
                          }
                        ],
                        "promptTokenCount": 16,
                        "promptTokensDetails": [
                          {
                            "modality": "TEXT",
                            "tokenCount": 16
                          }
                        ],
                        "totalTokenCount": 1331,
                        "trafficType": "ON_DEMAND"
                      }
                    }
                  }
                }
              }
            }
          },
          "400": {
            "$ref": "#/components/responses/Gemini25FlashImageBadRequest"
          },
          "401": {
            "$ref": "#/components/responses/Gemini25FlashImageUnauthorized"
          },
          "default": {
            "$ref": "#/components/responses/Gemini25FlashImageError"
          }
        }
      }
    }
  },
  "components": {
    "securitySchemes": {
      "xGoogApiKey": {
        "type": "apiKey",
        "in": "header",
        "name": "x-goog-api-key",
        "description": "ModelVerse API key sent as `x-goog-api-key: <MODELVERSE_API_KEY>`."
      },
      "bearerAuth": {
        "type": "http",
        "scheme": "bearer",
        "bearerFormat": "API key",
        "description": "ModelVerse API key sent as `Authorization: Bearer <MODELVERSE_API_KEY>`."
      }
    },
    "responses": {
      "Gemini25FlashImageBadRequest": {
        "description": "Invalid request parameters or generation error.",
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/Gemini25FlashImageErrorResponse"
            },
            "examples": {
              "documentedError": {
                "$ref": "#/components/examples/Gemini25FlashImageError"
              }
            }
          }
        }
      },
      "Gemini25FlashImageUnauthorized": {
        "description": "Authentication error.",
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/Gemini25FlashImageErrorResponse"
            },
            "examples": {
              "documentedError": {
                "$ref": "#/components/examples/Gemini25FlashImageError"
              }
            }
          }
        }
      },
      "Gemini25FlashImageError": {
        "description": "Error response.",
        "content": {
          "application/json": {
            "schema": {
              "$ref": "#/components/schemas/Gemini25FlashImageErrorResponse"
            },
            "examples": {
              "documentedError": {
                "$ref": "#/components/examples/Gemini25FlashImageError"
              }
            }
          }
        }
      }
    },
    "schemas": {
      "Gemini25FlashImageGenerateContentRequest": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "contents"
        ],
        "properties": {
          "contents": {
            "type": "array",
            "minItems": 1,
            "description": "Request content, containing one or more content parts.",
            "items": {
              "$ref": "#/components/schemas/Gemini25FlashImageRequestContent"
            }
          },
          "generationConfig": {
            "$ref": "#/components/schemas/Gemini25FlashImageGenerationConfig"
          }
        }
      },
      "Gemini25FlashImageRequestContent": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "role",
          "parts"
        ],
        "properties": {
          "role": {
            "type": "string",
            "const": "user",
            "default": "user",
            "description": "Content role. The source document fixes this value to `user`."
          },
          "parts": {
            "type": "array",
            "minItems": 1,
            "description": "Concrete content parts for the request.",
            "items": {
              "$ref": "#/components/schemas/Gemini25FlashImageRequestPart"
            }
          }
        }
      },
      "Gemini25FlashImageRequestPart": {
        "type": "object",
        "additionalProperties": false,
        "anyOf": [
          {
            "required": [
              "text"
            ]
          },
          {
            "required": [
              "inlineData"
            ]
          },
          {
            "required": [
              "fileData"
            ]
          },
          {
            "required": [
              "file_data"
            ]
          }
        ],
        "properties": {
          "text": {
            "type": "string",
            "minLength": 1,
            "description": "Prompt text."
          },
          "inlineData": {
            "$ref": "#/components/schemas/Gemini25FlashImageInlineData"
          },
          "fileData": {
            "$ref": "#/components/schemas/Gemini25FlashImageFileData"
          },
          "file_data": {
            "$ref": "#/components/schemas/Gemini25FlashImageFileDataSnakeCase"
          }
        }
      },
      "Gemini25FlashImageInlineData": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "mimeType",
          "data"
        ],
        "properties": {
          "mimeType": {
            "type": "string",
            "description": "MIME type for the inline data.",
            "examples": [
              "image/jpeg",
              "image/png"
            ]
          },
          "data": {
            "type": "string",
            "minLength": 1,
            "description": "Base64-encoded data."
          }
        }
      },
      "Gemini25FlashImageFileData": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "mimeType",
          "fileUri"
        ],
        "properties": {
          "mimeType": {
            "type": "string",
            "description": "MIME type for the referenced file.",
            "examples": [
              "image/jpeg",
              "image/png"
            ]
          },
          "fileUri": {
            "type": "string",
            "format": "uri",
            "description": "URI for the referenced file."
          }
        }
      },
      "Gemini25FlashImageFileDataSnakeCase": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "mime_type",
          "file_uri"
        ],
        "properties": {
          "mime_type": {
            "type": "string",
            "description": "MIME type for the referenced file when using snake_case.",
            "examples": [
              "image/jpeg",
              "image/png"
            ]
          },
          "file_uri": {
            "type": "string",
            "format": "uri",
            "description": "URI for the referenced file when using snake_case."
          }
        }
      },
      "Gemini25FlashImageGenerationConfig": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "responseModalities": {
            "type": "array",
            "minItems": 1,
            "default": [
              "TEXT",
              "IMAGE"
            ],
            "description": "Expected response modalities. The source examples require both\n`TEXT` and `IMAGE`; image-only output is not supported.\n",
            "items": {
              "$ref": "#/components/schemas/Gemini25FlashImageResponseModality"
            }
          }
        }
      },
      "Gemini25FlashImageResponseModality": {
        "type": "string",
        "enum": [
          "TEXT",
          "IMAGE"
        ],
        "description": "Response modality documented for this model."
      },
      "Gemini25FlashImageGenerateContentResponse": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "candidates"
        ],
        "properties": {
          "candidates": {
            "type": "array",
            "description": "Returned candidate content list.",
            "items": {
              "$ref": "#/components/schemas/Gemini25FlashImageCandidate"
            }
          },
          "usageMetadata": {
            "$ref": "#/components/schemas/Gemini25FlashImageUsageMetadata"
          }
        }
      },
      "Gemini25FlashImageCandidate": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "content": {
            "$ref": "#/components/schemas/Gemini25FlashImageResponseContent"
          },
          "finishReason": {
            "type": "string",
            "description": "Completion finish reason.",
            "examples": [
              "STOP"
            ]
          }
        }
      },
      "Gemini25FlashImageResponseContent": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "parts": {
            "type": "array",
            "description": "Content parts that may contain text and image data.",
            "items": {
              "$ref": "#/components/schemas/Gemini25FlashImageResponsePart"
            }
          },
          "role": {
            "type": "string",
            "const": "model",
            "description": "Content role for model output."
          }
        }
      },
      "Gemini25FlashImageResponsePart": {
        "type": "object",
        "additionalProperties": false,
        "anyOf": [
          {
            "required": [
              "text"
            ]
          },
          {
            "required": [
              "inlineData"
            ]
          }
        ],
        "properties": {
          "text": {
            "type": "string",
            "description": "Text returned by the model."
          },
          "inlineData": {
            "$ref": "#/components/schemas/Gemini25FlashImageResponseInlineData"
          },
          "thought": {
            "type": "boolean",
            "description": "Optional marker for intermediate thought parts shown by the source extraction examples."
          }
        }
      },
      "Gemini25FlashImageResponseInlineData": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "data",
          "mimeType"
        ],
        "properties": {
          "data": {
            "type": "string",
            "description": "Base64-encoded image data."
          },
          "mimeType": {
            "type": "string",
            "description": "MIME type for the returned image data.",
            "examples": [
              "image/png"
            ]
          }
        }
      },
      "Gemini25FlashImageUsageMetadata": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "candidatesTokenCount": {
            "type": "integer",
            "description": "Token count consumed by candidate output."
          },
          "candidatesTokensDetails": {
            "type": "array",
            "description": "Candidate token counts split by modality.",
            "items": {
              "$ref": "#/components/schemas/Gemini25FlashImageTokenDetails"
            }
          },
          "promptTokenCount": {
            "type": "integer",
            "description": "Token count consumed by the prompt."
          },
          "promptTokensDetails": {
            "type": "array",
            "description": "Prompt token counts split by modality.",
            "items": {
              "$ref": "#/components/schemas/Gemini25FlashImageTokenDetails"
            }
          },
          "totalTokenCount": {
            "type": "integer",
            "description": "Total token count consumed by the request."
          },
          "trafficType": {
            "type": "string",
            "description": "Traffic type shown in the source response example.",
            "examples": [
              "ON_DEMAND"
            ]
          }
        }
      },
      "Gemini25FlashImageTokenDetails": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "modality": {
            "type": "string",
            "enum": [
              "TEXT",
              "IMAGE"
            ],
            "description": "Token modality."
          },
          "tokenCount": {
            "type": "integer",
            "description": "Token count for this modality."
          }
        }
      },
      "Gemini25FlashImageErrorResponse": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "error"
        ],
        "properties": {
          "error": {
            "$ref": "#/components/schemas/Gemini25FlashImageErrorObject"
          }
        }
      },
      "Gemini25FlashImageErrorObject": {
        "type": "object",
        "additionalProperties": true,
        "properties": {
          "message": {
            "type": "string",
            "description": "Error message."
          },
          "type": {
            "type": "string",
            "description": "Error type."
          },
          "param": {
            "type": "string",
            "description": "Request ID or related parameter."
          },
          "code": {
            "type": "string",
            "description": "Error code."
          }
        }
      }
    },
    "examples": {
      "Gemini25FlashImageError": {
        "summary": "Documented error response",
        "value": {
          "error": {
            "message": "error_message",
            "type": "error_type",
            "param": "request_id",
            "code": "error_code"
          }
        }
      }
    }
  }
}
```