Gemini 生成图像（原生格式）

使用 Gemini 原生 generateContent 接口出图。选用图像能力模型（如 gemini-2.5-flash-image），生成的图片以 base64 内联在响应的 parts[].inlineData 中。

与文本对话共用同一端点 /v1beta/models/{model}:generateContent，区别在于使用图像模型并在 generationConfig.responseModalities 中声明 IMAGE。图文混排时可同时返回 TEXT。

POST /v1beta/models/{model}:generateContent https://api.covanexus.com

Authorization

Body

Authorization

Authorization BearerAuth

Authorization Bearer <token>

使用 Bearer Token 认证：Authorization: Bearer $COVA_NEXUS_API_KEY。也兼容 Gemini 风格的 x-goog-api-key: $COVA_NEXUS_API_KEY 请求头。

in: header

Request Body

application/json

contents* array[object]

生成提示，每项含 role 与 parts（文本，或用于图生图的 inlineData 图片）

generationConfig? object

生成配置。出图需设 responseModalities，如 ["TEXT","IMAGE"] 或 ["IMAGE"]；另支持 imageConfig.aspectRatio（如 "1:1"、"16:9"）等

systemInstruction? object

系统级指令（含 parts）

safetySettings? array[object]

安全过滤设置

Response Body

状态码	类型
200	application/json
400	application/json
429	application/json

curl -X POST \
  "https://api.covanexus.com/v1beta/models/gemini-2.5-flash-image:generateContent" \
  -H "Authorization: Bearer $COVA_NEXUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "contents": [
    {"role": "user", "parts": [{"text": "画一只戴贝雷帽的柴犬"}]}
  ],
  "generationConfig": {"responseModalities": ["TEXT", "IMAGE"]}
}'

const res = await fetch(
  "https://api.covanexus.com/v1beta/models/gemini-2.5-flash-image:generateContent",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer $COVA_NEXUS_API_KEY",
      "Content-Type": "application/json"
    },
    body: JSON.stringify({
      contents: [
        { role: "user", parts: [{ text: "画一只戴贝雷帽的柴犬" }] }
      ],
      generationConfig: { responseModalities: ["TEXT", "IMAGE"] }
    })
  }
);
const data = await res.json();
const img = data.candidates[0].content.parts
  .find(p => p.inlineData)?.inlineData.data; // base64

import base64, requests

url = ("https://api.covanexus.com/v1beta/models/"
       "gemini-2.5-flash-image:generateContent")
resp = requests.post(
    url,
    headers={"Authorization": "Bearer $COVA_NEXUS_API_KEY"},
    json={
        "contents": [
            {"role": "user", "parts": [{"text": "画一只戴贝雷帽的柴犬"}]}
        ],
        "generationConfig": {"responseModalities": ["TEXT", "IMAGE"]}
    }
)
for part in resp.json()["candidates"][0]["content"]["parts"]:
    if "inlineData" in part:
        with open("out.png", "wb") as f:
            f.write(base64.b64decode(part["inlineData"]["data"]))

200

400

429

{
  "candidates": [
    {
      "content": {
        "role": "model",
        "parts": [
          {
            "inlineData": {
              "mimeType": "image.png",
              "data": "<base64>"
            }
          }
        ]
      },
      "finishReason": "STOP",
      "index": 0
    }
  ],
  "usageMetadata": {
    "promptTokenCount": 0,
    "candidatesTokenCount": 0,
    "totalTokenCount": 0
  }
}

BearerAuth