> ## Documentation Index
> Fetch the complete documentation index at: https://docs.anyfast.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Gemini 3 Pro Preview (Stream)

> Google's Gemini 3 Pro Preview streaming via Gemini API. Real-time token streaming with SSE.

Gemini 3 Pro Preview (Stream) provides streaming text generation using Google's Gemini 3 Pro Preview model via Anyfast. Responses are delivered in real-time using Server-Sent Events (SSE).

## Key capabilities

* **SSE Streaming** — Real-time token-by-token response delivery
* **Thinking mode** — Supports thinking configuration for enhanced reasoning
* **Multi-turn conversations** — Handles complex dialogue with system instructions
* **Safety settings** — Configurable content safety filters

## Quick example

<CodeGroup>
  ```bash cURL theme={null}
  curl "https://www.anyfast.ai/v1beta/models/gemini-3-pro-preview:streamGenerateContent?key=YOUR_API_KEY&alt=sse" \
    -H "Content-Type: application/json" \
    -d '{
      "contents": [
        {
          "role": "user",
          "parts": [{ "text": "Write a short poem about the ocean." }]
        }
      ],
      "generationConfig": {
        "temperature": 1,
        "topP": 1,
        "thinkingConfig": {
          "includeThoughts": true,
          "thinkingBudget": 26240
        }
      }
    }'
  ```

  ```python Python theme={null}
  import requests

  url = "https://www.anyfast.ai/v1beta/models/gemini-3-pro-preview:streamGenerateContent"
  params = {"key": "YOUR_API_KEY", "alt": "sse"}
  data = {
      "contents": [
          {
              "role": "user",
              "parts": [{"text": "Write a short poem about the ocean."}]
          }
      ],
      "generationConfig": {
          "temperature": 1,
          "topP": 1,
          "thinkingConfig": {
              "includeThoughts": True,
              "thinkingBudget": 26240
          }
      }
  }

  response = requests.post(url, params=params, json=data, stream=True)
  for line in response.iter_lines():
      if line:
          print(line.decode())
  ```
</CodeGroup>

## Parameters

| Parameter                         | Type   | Required | Description                                |
| --------------------------------- | ------ | -------- | ------------------------------------------ |
| `key`                             | string | Yes      | API key (query parameter)                  |
| `alt`                             | string | No       | Set to `sse` for SSE streaming             |
| `contents`                        | array  | Yes      | Array of `{ role, parts }` objects         |
| `systemInstruction`               | object | No       | System instruction with `parts` array      |
| `generationConfig.temperature`    | float  | No       | `0`–`2`. Controls randomness. Default: `1` |
| `generationConfig.topP`           | float  | No       | Nucleus sampling threshold. Default: `1`   |
| `generationConfig.thinkingConfig` | object | No       | Thinking mode configuration                |
| `safetySettings`                  | array  | No       | Content safety filter settings             |

<Card title="API Reference" icon="code" href="/api-reference/model-api/google/gemini-3-pro-preview-stream">
  View the interactive API playground for Gemini 3 Pro Preview (Stream).
</Card>

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