文字生成

Gemini API 可根據文字、圖片、影片和音訊輸入內容生成文字輸出內容。

基本範例如下：

Python

from google import genai

client = genai.Client()

response = client.models.generate_content(
    model="gemini-3.5-flash",
    contents="How does AI work?"
)
print(response.text)

JavaScript

import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI({});

async function main() {
  const response = await ai.models.generateContent({
    model: "gemini-3.5-flash",
    contents: "How does AI work?",
  });
  console.log(response.text);
}

await main();

Go

package main

import (
  "context"
  "fmt"
  "os"
  "google.golang.org/genai"
)

func main() {

  ctx := context.Background()
  client, err := genai.NewClient(ctx, nil)
  if err != nil {
      log.Fatal(err)
  }

  result, _ := client.Models.GenerateContent(
      ctx,
      "gemini-3.5-flash",
      genai.Text("Explain how AI works in a few words"),
      nil,
  )

  fmt.Println(result.Text())
}

Java

import com.google.genai.Client;
import com.google.genai.types.GenerateContentResponse;

public class GenerateContentWithTextInput {
  public static void main(String[] args) {

    Client client = new Client();

    GenerateContentResponse response =
        client.models.generateContent("gemini-3.5-flash", "How does AI work?", null);

    System.out.println(response.text());
  }
}

REST

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{
    "contents": [
      {
        "parts": [
          {
            "text": "How does AI work?"
          }
        ]
      }
    ]
  }'

Apps Script

// See https://developers.google.com/apps-script/guides/properties
// for instructions on how to set the API key.
const apiKey = PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY');

function main() {
  const payload = {
    contents: [
      {
        parts: [
          { text: 'How AI does work?' },
        ],
      },
    ],
  };

  const url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent';
  const options = {
    method: 'POST',
    contentType: 'application/json',
    headers: {
      'x-goog-api-key': apiKey,
    },
    payload: JSON.stringify(payload)
  };

  const response = UrlFetchApp.fetch(url, options);
  const data = JSON.parse(response);
  const content = data['candidates'][0]['content']['parts'][0]['text'];
  console.log(content);
}

與 Gemini 一起思考

Gemini 模型預設會啟用「思考」功能，因此模型會在回覆要求前先進行推論。

每種模型支援不同的思考設定，可讓您控管成本、延遲和智慧。詳情請參閱思考指南。

Python

from google import genai
from google.genai import types

client = genai.Client()

response = client.models.generate_content(
    model="gemini-3.5-flash",
    contents="How does AI work?",
    config=types.GenerateContentConfig(
        thinking_config=types.ThinkingConfig(thinking_level="low")
    ),
)
print(response.text)

JavaScript

import { GoogleGenAI, ThinkingLevel } from "@google/genai";

const ai = new GoogleGenAI({});

async function main() {
  const response = await ai.models.generateContent({
    model: "gemini-3.5-flash",
    contents: "How does AI work?",
    config: {
      thinkingConfig: {
        thinkingLevel: ThinkingLevel.LOW,
      },
    }
  });
  console.log(response.text);
}

await main();

Go

package main

import (
  "context"
  "fmt"
  "os"
  "google.golang.org/genai"
)

func main() {

  ctx := context.Background()
  client, err := genai.NewClient(ctx, nil)
  if err != nil {
      log.Fatal(err)
  }

  thinkingLevelVal := "low"

  result, _ := client.Models.GenerateContent(
      ctx,
      "gemini-3.5-flash",
      genai.Text("How does AI work?"),
      &genai.GenerateContentConfig{
        ThinkingConfig: &genai.ThinkingConfig{
            ThinkingLevel: &thinkingLevelVal,
        },
      }
  )

  fmt.Println(result.Text())
}

Java

import com.google.genai.Client;
import com.google.genai.types.GenerateContentConfig;
import com.google.genai.types.GenerateContentResponse;
import com.google.genai.types.ThinkingConfig;
import com.google.genai.types.ThinkingLevel;

public class GenerateContentWithThinkingConfig {
  public static void main(String[] args) {

    Client client = new Client();

    GenerateContentConfig config =
        GenerateContentConfig.builder()
            .thinkingConfig(ThinkingConfig.builder().thinkingLevel(new ThinkingLevel("low")))
            .build();

    GenerateContentResponse response =
        client.models.generateContent("gemini-3.5-flash", "How does AI work?", config);

    System.out.println(response.text());
  }
}

REST

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{
    "contents": [
      {
        "parts": [
          {
            "text": "How does AI work?"
          }
        ]
      }
    ],
    "generationConfig": {
      "thinkingConfig": {
        "thinkingLevel": "low"
      }
    }
  }'

Apps Script

// See https://developers.google.com/apps-script/guides/properties
// for instructions on how to set the API key.
const apiKey = PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY');

function main() {
  const payload = {
    contents: [
      {
        parts: [
          { text: 'How AI does work?' },
        ],
      },
    ],
    generationConfig: {
      thinkingConfig: {
        thinkingLevel: 'low'
      }
    }
  };

  const url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent';
  const options = {
    method: 'POST',
    contentType: 'application/json',
    headers: {
      'x-goog-api-key': apiKey,
    },
    payload: JSON.stringify(payload)
  };

  const response = UrlFetchApp.fetch(url, options);
  const data = JSON.parse(response);
  const content = data['candidates'][0]['content']['parts'][0]['text'];
  console.log(content);
}

系統指令和其他設定

你可以使用系統指令引導 Gemini 模型的行為。如要這麼做，請傳遞 GenerateContentConfig 物件。

Python

from google import genai
from google.genai import types

client = genai.Client()

response = client.models.generate_content(
    model="gemini-3.5-flash",
    config=types.GenerateContentConfig(
        system_instruction="You are a cat. Your name is Neko."),
    contents="Hello there"
)

print(response.text)

JavaScript

import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI({});

async function main() {
  const response = await ai.models.generateContent({
    model: "gemini-3.5-flash",
    contents: "Hello there",
    config: {
      systemInstruction: "You are a cat. Your name is Neko.",
    },
  });
  console.log(response.text);
}

await main();

Go

package main

import (
  "context"
  "fmt"
  "os"
  "google.golang.org/genai"
)

func main() {

  ctx := context.Background()
  client, err := genai.NewClient(ctx, nil)
  if err != nil {
      log.Fatal(err)
  }

  config := &genai.GenerateContentConfig{
      SystemInstruction: genai.NewContentFromText("You are a cat. Your name is Neko.", genai.RoleUser),
  }

  result, _ := client.Models.GenerateContent(
      ctx,
      "gemini-3.5-flash",
      genai.Text("Hello there"),
      config,
  )

  fmt.Println(result.Text())
}

Java

import com.google.genai.Client;
import com.google.genai.types.Content;
import com.google.genai.types.GenerateContentConfig;
import com.google.genai.types.GenerateContentResponse;
import com.google.genai.types.Part;

public class GenerateContentWithSystemInstruction {
  public static void main(String[] args) {

    Client client = new Client();

    GenerateContentConfig config =
        GenerateContentConfig.builder()
            .systemInstruction(
                Content.fromParts(Part.fromText("You are a cat. Your name is Neko.")))
            .build();

    GenerateContentResponse response =
        client.models.generateContent("gemini-3.5-flash", "Hello there", config);

    System.out.println(response.text());
  }
}

REST

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "system_instruction": {
      "parts": [
        {
          "text": "You are a cat. Your name is Neko."
        }
      ]
    },
    "contents": [
      {
        "parts": [
          {
            "text": "Hello there"
          }
        ]
      }
    ]
  }'

Apps Script

// See https://developers.google.com/apps-script/guides/properties
// for instructions on how to set the API key.
const apiKey = PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY');

function main() {
  const systemInstruction = {
    parts: [{
      text: 'You are a cat. Your name is Neko.'
    }]
  };

  const payload = {
    systemInstruction,
    contents: [
      {
        parts: [
          { text: 'Hello there' },
        ],
      },
    ],
  };

  const url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent';
  const options = {
    method: 'POST',
    contentType: 'application/json',
    headers: {
      'x-goog-api-key': apiKey,
    },
    payload: JSON.stringify(payload)
  };

  const response = UrlFetchApp.fetch(url, options);
  const data = JSON.parse(response);
  const content = data['candidates'][0]['content']['parts'][0]['text'];
  console.log(content);
}

GenerateContentConfig 物件也允許您覆寫預設生成參數，例如 max_output_tokens。

Python

from google import genai
from google.genai import types

client = genai.Client()

response = client.models.generate_content(
    model="gemini-3.5-flash",
    contents=["Explain how AI works"],
    config=types.GenerateContentConfig(
        max_output_tokens=1000
    )
)
print(response.text)

JavaScript

import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI({});

async function main() {
  const response = await ai.models.generateContent({
    model: "gemini-3.5-flash",
    contents: "Explain how AI works",
    config: {
      maxOutputTokens: 1000,
    },
  });
  console.log(response.text);
}

await main();

Go

package main

import (
  "context"
  "fmt"
  "log"
  "google.golang.org/genai"
)

func main() {

  ctx := context.Background()
  client, err := genai.NewClient(ctx, nil)
  if err != nil {
      log.Fatal(err)
  }

  config := &genai.GenerateContentConfig{
    MaxOutputTokens:   1000,
    ResponseMIMEType:  "application/json",
  }

  result, _ := client.Models.GenerateContent(
    ctx,
    "gemini-3.5-flash",
    genai.Text("What is the average size of a swallow?"),
    config,
  )

  fmt.Println(result.Text())
}

Java

import com.google.genai.Client;
import com.google.genai.types.GenerateContentConfig;
import com.google.genai.types.GenerateContentResponse;

public class GenerateContentWithConfig {
  public static void main(String[] args) {

    Client client = new Client();

    GenerateContentConfig config = GenerateContentConfig.builder().maxOutputTokens(1000).build();

    GenerateContentResponse response =
        client.models.generateContent("gemini-3.5-flash", "Explain how AI works", config);

    System.out.println(response.text());
  }
}

REST

curl https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{
    "contents": [
      {
        "parts": [
          {
            "text": "Explain how AI works"
          }
        ]
      }
    ],
    "generationConfig": {
      "stopSequences": [
        "Title"
      ],
      "maxOutputTokens": 1000
    }
  }'

Apps Script

// See https://developers.google.com/apps-script/guides/properties
// for instructions on how to set the API key.
const apiKey = PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY');

function main() {
  const generationConfig = {
    maxOutputTokens: 1000,
    responseFormat: { text: { mimeType: "text/plain" } },
  };

  const payload = {
    generationConfig,
    contents: [
      {
        parts: [
          { text: 'Explain how AI works in a few words' },
        ],
      },
    ],
  };

  const url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent';
  const options = {
    method: 'POST',
    contentType: 'application/json',
    headers: {
      'x-goog-api-key': apiKey,
    },
    payload: JSON.stringify(payload)
  };

  const response = UrlFetchApp.fetch(url, options);
  const data = JSON.parse(response);
  const content = data['candidates'][0]['content']['parts'][0]['text'];
  console.log(content);
}

如需可設定參數的完整清單及其說明，請參閱 API 參考資料中的 GenerateContentConfig。

多模態輸入內容

Gemini API 支援多模態輸入內容，可讓您結合文字和媒體檔案。以下範例說明如何提供圖片：

Python

from PIL import Image
from google import genai

client = genai.Client()

image = Image.open("/path/to/organ.png")
response = client.models.generate_content(
    model="gemini-3.5-flash",
    contents=[image, "Tell me about this instrument"]
)
print(response.text)

JavaScript

import {
  GoogleGenAI,
  createUserContent,
  createPartFromUri,
} from "@google/genai";

const ai = new GoogleGenAI({});

async function main() {
  const image = await ai.files.upload({
    file: "/path/to/organ.png",
  });
  const response = await ai.models.generateContent({
    model: "gemini-3.5-flash",
    contents: [
      createUserContent([
        "Tell me about this instrument",
        createPartFromUri(image.uri, image.mimeType),
      ]),
    ],
  });
  console.log(response.text);
}

await main();

Go

package main

import (
  "context"
  "fmt"
  "os"
  "google.golang.org/genai"
)

func main() {

  ctx := context.Background()
  client, err := genai.NewClient(ctx, nil)
  if err != nil {
      log.Fatal(err)
  }

  imagePath := "/path/to/organ.jpg"
  imgData, _ := os.ReadFile(imagePath)

  parts := []*genai.Part{
      genai.NewPartFromText("Tell me about this instrument"),
      &genai.Part{
          InlineData: &genai.Blob{
              MIMEType: "image/jpeg",
              Data:     imgData,
          },
      },
  }

  contents := []*genai.Content{
      genai.NewContentFromParts(parts, genai.RoleUser),
  }

  result, _ := client.Models.GenerateContent(
      ctx,
      "gemini-3.5-flash",
      contents,
      nil,
  )

  fmt.Println(result.Text())
}

Java

import com.google.genai.Client;
import com.google.genai.Content;
import com.google.genai.types.GenerateContentResponse;
import com.google.genai.types.Part;

public class GenerateContentWithMultiModalInputs {
  public static void main(String[] args) {

    Client client = new Client();

    Content content =
      Content.fromParts(
          Part.fromText("Tell me about this instrument"),
          Part.fromUri("/path/to/organ.jpg", "image/jpeg"));

    GenerateContentResponse response =
        client.models.generateContent("gemini-3.5-flash", content, null);

    System.out.println(response.text());
  }
}

REST

# Use a temporary file to hold the base64 encoded image data
TEMP_B64=$(mktemp)
trap 'rm -f "$TEMP_B64"' EXIT
base64 $B64FLAGS $IMG_PATH > "$TEMP_B64"

# Use a temporary file to hold the JSON payload
TEMP_JSON=$(mktemp)
trap 'rm -f "$TEMP_JSON"' EXIT

cat > "$TEMP_JSON" << EOF
{
  "contents": [
    {
      "parts": [
        {
          "text": "Tell me about this instrument"
        },
        {
          "inline_data": {
            "mime_type": "image/jpeg",
            "data": "$(cat "$TEMP_B64")"
          }
        }
      ]
    }
  ]
}
EOF

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  -X POST \
  -d "@$TEMP_JSON"

Apps Script

// See https://developers.google.com/apps-script/guides/properties
// for instructions on how to set the API key.
const apiKey = PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY');

function main() {
  const imageUrl = 'https://example.com/image.jpg';
  const image = getImageData(imageUrl);
  const payload = {
    contents: [
      {
        parts: [
          { image },
          { text: 'Tell me about this instrument' },
        ],
      },
    ],
  };

  const url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent';
  const options = {
    method: 'POST',
    contentType: 'application/json',
    headers: {
      'x-goog-api-key': apiKey,
    },
    payload: JSON.stringify(payload)
  };

  const response = UrlFetchApp.fetch(url, options);
  const data = JSON.parse(response);
  const content = data['candidates'][0]['content']['parts'][0]['text'];
  console.log(content);
}

function getImageData(url) {
  const blob = UrlFetchApp.fetch(url).getBlob();

  return {
    mimeType: blob.getContentType(),
    data: Utilities.base64Encode(blob.getBytes())
  };
}

如需提供圖片的替代方法和更進階的圖片處理方式，請參閱圖像解讀指南。API 也支援文件、影片和音訊輸入和理解。

逐句顯示回覆

根據預設，整個生成程序完成後，模型才會傳回回覆。

如要獲得更流暢的互動體驗，請使用串流功能，逐步接收生成的 GenerateContentResponse 執行個體。

Python

from google import genai

client = genai.Client()

response = client.models.generate_content_stream(
    model="gemini-3.5-flash",
    contents=["Explain how AI works"]
)
for chunk in response:
    print(chunk.text, end="")

JavaScript

import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI({});

async function main() {
  const response = await ai.models.generateContentStream({
    model: "gemini-3.5-flash",
    contents: "Explain how AI works",
  });

  for await (const chunk of response) {
    console.log(chunk.text);
  }
}

await main();

Go

package main

import (
  "context"
  "fmt"
  "os"
  "google.golang.org/genai"
)

func main() {

  ctx := context.Background()
  client, err := genai.NewClient(ctx, nil)
  if err != nil {
      log.Fatal(err)
  }

  stream := client.Models.GenerateContentStream(
      ctx,
      "gemini-3.5-flash",
      genai.Text("Write a story about a magic backpack."),
      nil,
  )

  for chunk, _ := range stream {
      part := chunk.Candidates[0].Content.Parts[0]
      fmt.Print(part.Text)
  }
}

Java

import com.google.genai.Client;
import com.google.genai.ResponseStream;
import com.google.genai.types.GenerateContentResponse;

public class GenerateContentStream {
  public static void main(String[] args) {

    Client client = new Client();

    ResponseStream<GenerateContentResponse> responseStream =
      client.models.generateContentStream(
          "gemini-3.5-flash", "Write a story about a magic backpack.", null);

    for (GenerateContentResponse res : responseStream) {
      System.out.print(res.text());
    }

    // To save resources and avoid connection leaks, it is recommended to close the response
    // stream after consumption (or using try block to get the response stream).
    responseStream.close();
  }
}

REST

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:streamGenerateContent?alt=sse" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  --no-buffer \
  -d '{
    "contents": [
      {
        "parts": [
          {
            "text": "Explain how AI works"
          }
        ]
      }
    ]
  }'

Apps Script

// See https://developers.google.com/apps-script/guides/properties
// for instructions on how to set the API key.
const apiKey = PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY');

function main() {
  const payload = {
    contents: [
      {
        parts: [
          { text: 'Explain how AI works' },
        ],
      },
    ],
  };

  const url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:streamGenerateContent';
  const options = {
    method: 'POST',
    contentType: 'application/json',
    headers: {
      'x-goog-api-key': apiKey,
    },
    payload: JSON.stringify(payload)
  };

  const response = UrlFetchApp.fetch(url, options);
  const data = JSON.parse(response);
  const content = data['candidates'][0]['content']['parts'][0]['text'];
  console.log(content);
}

多輪對話 (即時通訊)

我們的 SDK 提供功能，可將多輪提示和回覆收集到對話中，讓您輕鬆追蹤對話記錄。

Python

from google import genai

client = genai.Client()
chat = client.chats.create(model="gemini-3.5-flash")

response = chat.send_message("I have 2 dogs in my house.")
print(response.text)

response = chat.send_message("How many paws are in my house?")
print(response.text)

for message in chat.get_history():
    print(f'role - {message.role}',end=": ")
    print(message.parts[0].text)

JavaScript

import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI({});

async function main() {
  const chat = ai.chats.create({
    model: "gemini-3.5-flash",
    history: [
      {
        role: "user",
        parts: [{ text: "Hello" }],
      },
      {
        role: "model",
        parts: [{ text: "Great to meet you. What would you like to know?" }],
      },
    ],
  });

  const response1 = await chat.sendMessage({
    message: "I have 2 dogs in my house.",
  });
  console.log("Chat response 1:", response1.text);

  const response2 = await chat.sendMessage({
    message: "How many paws are in my house?",
  });
  console.log("Chat response 2:", response2.text);
}

await main();

Go

package main

import (
  "context"
  "fmt"
  "os"
  "google.golang.org/genai"
)

func main() {

  ctx := context.Background()
  client, err := genai.NewClient(ctx, nil)
  if err != nil {
      log.Fatal(err)
  }

  history := []*genai.Content{
      genai.NewContentFromText("Hi nice to meet you! I have 2 dogs in my house.", genai.RoleUser),
      genai.NewContentFromText("Great to meet you. What would you like to know?", genai.RoleModel),
  }

  chat, _ := client.Chats.Create(ctx, "gemini-3.5-flash", nil, history)
  res, _ := chat.SendMessage(ctx, genai.Part{Text: "How many paws are in my house?"})

  if len(res.Candidates) > 0 {
      fmt.Println(res.Candidates[0].Content.Parts[0].Text)
  }
}

Java

import com.google.genai.Chat;
import com.google.genai.Client;
import com.google.genai.types.Content;
import com.google.genai.types.GenerateContentResponse;

public class MultiTurnConversation {
  public static void main(String[] args) {

    Client client = new Client();
    Chat chatSession = client.chats.create("gemini-3.5-flash");

    GenerateContentResponse response =
        chatSession.sendMessage("I have 2 dogs in my house.");
    System.out.println("First response: " + response.text());

    response = chatSession.sendMessage("How many paws are in my house?");
    System.out.println("Second response: " + response.text());

    // Get the history of the chat session.
    // Passing 'true' to getHistory() returns the curated history, which excludes
    // empty or invalid parts.
    // Passing 'false' here would return the comprehensive history, including
    // empty or invalid parts.
    ImmutableList<Content> history = chatSession.getHistory(true);
    System.out.println("History: " + history);
  }
}

REST

curl https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {
            "text": "Hello"
          }
        ]
      },
      {
        "role": "model",
        "parts": [
          {
            "text": "Great to meet you. What would you like to know?"
          }
        ]
      },
      {
        "role": "user",
        "parts": [
          {
            "text": "I have two dogs in my house. How many paws are in my house?"
          }
        ]
      }
    ]
  }'

Apps Script

// See https://developers.google.com/apps-script/guides/properties
// for instructions on how to set the API key.
const apiKey = PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY');

function main() {
  const payload = {
    contents: [
      {
        role: 'user',
        parts: [
          { text: 'Hello' },
        ],
      },
      {
        role: 'model',
        parts: [
          { text: 'Great to meet you. What would you like to know?' },
        ],
      },
      {
        role: 'user',
        parts: [
          { text: 'I have two dogs in my house. How many paws are in my house?' },
        ],
      },
    ],
  };

  const url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent';
  const options = {
    method: 'POST',
    contentType: 'application/json',
    headers: {
      'x-goog-api-key': apiKey,
    },
    payload: JSON.stringify(payload)
  };

  const response = UrlFetchApp.fetch(url, options);
  const data = JSON.parse(response);
  const content = data['candidates'][0]['content']['parts'][0]['text'];
  console.log(content);
}

串流功能也可用於多輪對話。

Python

from google import genai

client = genai.Client()
chat = client.chats.create(model="gemini-3.5-flash")

response = chat.send_message_stream("I have 2 dogs in my house.")
for chunk in response:
    print(chunk.text, end="")

response = chat.send_message_stream("How many paws are in my house?")
for chunk in response:
    print(chunk.text, end="")

for message in chat.get_history():
    print(f'role - {message.role}', end=": ")
    print(message.parts[0].text)

JavaScript

import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI({});

async function main() {
  const chat = ai.chats.create({
    model: "gemini-3.5-flash",
    history: [
      {
        role: "user",
        parts: [{ text: "Hello" }],
      },
      {
        role: "model",
        parts: [{ text: "Great to meet you. What would you like to know?" }],
      },
    ],
  });

  const stream1 = await chat.sendMessageStream({
    message: "I have 2 dogs in my house.",
  });
  for await (const chunk of stream1) {
    console.log(chunk.text);
    console.log("_".repeat(80));
  }

  const stream2 = await chat.sendMessageStream({
    message: "How many paws are in my house?",
  });
  for await (const chunk of stream2) {
    console.log(chunk.text);
    console.log("_".repeat(80));
  }
}

await main();

Go

package main

import (
  "context"
  "fmt"
  "os"
  "google.golang.org/genai"
)

func main() {

  ctx := context.Background()
  client, err := genai.NewClient(ctx, nil)
  if err != nil {
      log.Fatal(err)
  }

  history := []*genai.Content{
      genai.NewContentFromText("Hi nice to meet you! I have 2 dogs in my house.", genai.RoleUser),
      genai.NewContentFromText("Great to meet you. What would you like to know?", genai.RoleModel),
  }

  chat, _ := client.Chats.Create(ctx, "gemini-3.5-flash", nil, history)
  stream := chat.SendMessageStream(ctx, genai.Part{Text: "How many paws are in my house?"})

  for chunk, _ := range stream {
      part := chunk.Candidates[0].Content.Parts[0]
      fmt.Print(part.Text)
  }
}

Java

import com.google.genai.Chat;
import com.google.genai.Client;
import com.google.genai.ResponseStream;
import com.google.genai.types.GenerateContentResponse;

public class MultiTurnConversationWithStreaming {
  public static void main(String[] args) {

    Client client = new Client();
    Chat chatSession = client.chats.create("gemini-3.5-flash");

    ResponseStream<GenerateContentResponse> responseStream =
        chatSession.sendMessageStream("I have 2 dogs in my house.", null);

    for (GenerateContentResponse response : responseStream) {
      System.out.print(response.text());
    }

    responseStream = chatSession.sendMessageStream("How many paws are in my house?", null);

    for (GenerateContentResponse response : responseStream) {
      System.out.print(response.text());
    }

    // Get the history of the chat session. History is added after the stream
    // is consumed and includes the aggregated response from the stream.
    System.out.println("History: " + chatSession.getHistory(false));
  }
}

REST

curl https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:streamGenerateContent?alt=sse \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {
            "text": "Hello"
          }
        ]
      },
      {
        "role": "model",
        "parts": [
          {
            "text": "Great to meet you. What would you like to know?"
          }
        ]
      },
      {
        "role": "user",
        "parts": [
          {
            "text": "I have two dogs in my house. How many paws are in my house?"
          }
        ]
      }
    ]
  }'

Apps Script

// See https://developers.google.com/apps-script/guides/properties
// for instructions on how to set the API key.
const apiKey = PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY');

function main() {
  const payload = {
    contents: [
      {
        role: 'user',
        parts: [
          { text: 'Hello' },
        ],
      },
      {
        role: 'model',
        parts: [
          { text: 'Great to meet you. What would you like to know?' },
        ],
      },
      {
        role: 'user',
        parts: [
          { text: 'I have two dogs in my house. How many paws are in my house?' },
        ],
      },
    ],
  };

  const url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:streamGenerateContent';
  const options = {
    method: 'POST',
    contentType: 'application/json',
    headers: {
      'x-goog-api-key': apiKey,
    },
    payload: JSON.stringify(payload)
  };

  const response = UrlFetchApp.fetch(url, options);
  const data = JSON.parse(response);
  const content = data['candidates'][0]['content']['parts'][0]['text'];
  console.log(content);
}

提示詞撰寫訣竅

如要瞭解如何充分發揮 Gemini 的效用，請參閱提示工程指南。

後續步驟

內容生成

這是將提示傳送至模型的主要端點。生成內容的端點有兩個，主要差異在於接收回應的方式：

  • generateContent (REST)： 接收要求，並在模型完成整個生成程序後，提供單一回覆。
  • streamGenerateContent (SSE)：接收完全相同的要求，但模型會在生成回覆時，將回覆內容分塊串流傳回。這項功能可立即顯示部分結果，因此能為互動式應用程式提供更優質的使用者體驗。

要求主體結構

要求主體是 JSON 物件，在標準和串流模式中完全相同，且由幾個核心物件建構而成：

  • Content 物件：代表對話中的單一回合。
  • Part 物件：Content 輪流中的一筆資料 (例如文字或圖片)。
  • inline_data (Blob)：原始媒體位元組的容器，以及這些位元組的 MIME 類型。

在最高層級，要求主體包含 contents 物件，這是 Content 物件的清單，每個物件代表對話中的一輪。在大多數情況下，如要生成基本文字，您會使用單一 Content 物件，但如要保留對話記錄，則可使用多個 Content 物件。

以下是典型的 generateContent 要求主體：

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{
    "contents": [
      {
          "role": "user",
          "parts": [
              // A list of Part objects goes here
          ]
      },
      {
          "role": "model",
          "parts": [
              // A list of Part objects goes here
          ]
      }
    ]
  }'

回應主體結構

串流和標準模式的回應內文類似，但有以下例外狀況：

整體來說，回應主體包含 candidates 物件，這是 Candidate 物件的清單。Candidate 物件包含 Content 物件，該物件具有模型傳回的生成回覆。

REST API 範例

多模態提示 (文字和圖片)

如要在提示中同時提供文字和圖片，parts 陣列應包含兩個 Part 物件：一個用於文字，另一個用於圖片 inline_data。

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent" \
-H "x-goog-api-key: $GEMINI_API_KEY" \
-H 'Content-Type: application/json' \
-X POST \
-d '{
    "contents": [{
    "parts":[
        {
            "inline_data": {
            "mime_type":"image/jpeg",
            "data": "/9j/4AAQSkZJRgABAQ... (base64-encoded image)"
            }
        },
        {"text": "What is in this picture?"},
      ]
    }]
  }'

多輪對話 (即時通訊)

如要建構多輪對話，請定義包含多個 Content 物件的 contents 陣列。API 會將整個記錄做為下一個回應的脈絡資訊。每個 Content 物件的 role 應在 user 和 model 之間交替。

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.5-flash:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          { "text": "Hello." }
        ]
      },
      {
        "role": "model",
        "parts": [
          { "text": "Hello! How can I help you today?" }
        ]
      },
      {
        "role": "user",
        "parts": [
          { "text": "Please write a four-line poem about the ocean." }
        ]
      }
    ]
  }'

重點整理

  • Content 是信封：這是訊息回合的頂層容器，無論訊息來自使用者或模型都適用。
  • Part 啟用多模態：在單一 Content 物件中使用多個 Part 物件，即可合併不同類型的資料 (文字、圖片、影片 URI 等)。
  • 選擇資料方法：
    • 如果是直接嵌入的小型媒體 (例如大多數圖片)，請使用 Part，並搭配 inline_data。
    • 如要上傳較大的檔案，或在多個要求中重複使用檔案，請使用 File API 上傳檔案，並以 file_data 部分參照該檔案。
  • 管理對話記錄：如果是使用 REST API 的即時通訊應用程式，請為每個回合附加 Content 物件，交替使用 "user" 和 "model" 角色，藉此建構 contents 陣列。如果您使用 SDK，請參閱 SDK 說明文件，瞭解管理對話記錄的建議方式。

回覆範例

下列範例說明這些元件如何搭配運作，處理不同類型的要求。

純文字回覆

預設文字回覆包含 candidates 陣列，其中有一或多個包含模型回覆的 content 物件。

以下是標準回應的範例：

{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "text": "At its core, Artificial Intelligence works by learning from vast amounts of data ..."
          }
        ],
        "role": "model"
      },
      "finishReason": "STOP",
      "index": 1
    }
  ],
}

以下是一連串的串流回應。每個回應都包含一個 responseId，可將完整的回應連結在一起：

{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "text": "The image displays"
          }
        ],
        "role": "model"
      },
      "index": 0
    }
  ],
  "usageMetadata": {
    "promptTokenCount": ...
  },
  "modelVersion": "gemini-3.5-flash",
  "responseId": "mAitaLmkHPPlz7IPvtfUqQ4"
}

...

{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "text": " the following materials:\n\n*   **Wood:** The accordion and the violin are primarily"
          }
        ],
        "role": "model"
      },
      "index": 0
    }
  ],
  "usageMetadata": {
    "promptTokenCount": ...
  }
  "modelVersion": "gemini-3.5-flash",
  "responseId": "mAitaLmkHPPlz7IPvtfUqQ4"
}

Live API (BidiGenerateContent) WebSockets API

Live API 提供以 WebSocket 為基礎的具狀態 API，可進行雙向串流，實現即時串流用途。如需更多詳細資料，請參閱 Live API 指南和 Live API 參考資料。

專用模型

除了 Gemini 系列模型，Gemini API 也提供 Imagen、Lyria 和嵌入模型等專業模型的端點。請參閱「模型」部分中的指南。

平台 API

其餘端點則可啟用其他功能，與目前所述的主要端點搭配使用。如要瞭解詳情，請參閱「指南」部分的「批次模式」和「檔案 API」主題。

後續步驟

如果你剛開始使用，請參閱下列指南，瞭解 Gemini API 程式設計模型：

您也可以參閱功能指南，瞭解不同的 Gemini API 功能並取得程式碼範例：