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Streaming version of the Gemini generateContent endpoint. Returns Server-Sent Events.

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Path Parameters

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model
string
required
Model name (e.g., gemini-2.5-pro, gemini-2.5-flash).

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Query Parameters

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key
string
API key (alternative to header authentication).

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Request Body

Same as Generate Content. This includes multimodal parts arrays with structured inline_data image parts for vision requests. For streaming requests, omit generationConfig.candidateCount or keep it at 1; requests with a larger value are rejected instead of silently dropping extra candidates.

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Response

Returns a stream of JSON objects, each containing a partial response. 
curl -X POST "https://api.lemondata.cc/v1beta/models/gemini-2.5-pro:streamGenerateContent?key=sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "parts": [{"text": "Tell me a story"}]
      }
    ]
  }'

{
  "candidates": [
    {
      "content": {
        "role": "model",
        "parts": [
          {"text": "Once upon a time"}
        ]
      }
    }
  ]
}