Gemini API Google AI for Developers

Gemini API | Google AI for Developers

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This repository contains the source code for the community-driven documentation for the Google Gemini API, hosted at https://rikhoffbauer.github.io/google-gemini-documentation/.

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Get a Gemini API Key

Get a Gemini API key and make your first API request in minutes.

Python

from google import genai
client = genai.Client()
response = client.models.generate_content(
    model="gemini-2.5-flash",
    contents="Explain how AI works in a few words"
)
print(response.text)

JavaScript

import { GoogleGenAI } from "@google/genai";
const ai = new GoogleGenAI({});
async function main() {
    const response = await ai.models.generateContent({
        model: "gemini-2.5-flash",
        contents: "Explain how AI works in a few words",
    });
    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)
    }
    result, err := client.Models.GenerateContent(
        ctx, "gemini-2.5-flash", genai.Text("Explain how AI works in a few words"), nil,
    )
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(result.Text())
}

Java

package com.example;
import com.google.genai.Client;
import com.google.genai.types.GenerateContentResponse;
public class GenerateTextFromTextInput {
    public static void main(String[] args) {
        Client client = new Client();
        GenerateContentResponse response = client.models.generateContent(
            "gemini-2.5-flash", "Explain how AI works in a few words", null);
        System.out.println(response.text());
    }
}

REST

curl "https://generativelaanguage.googleapis.com/v1beta/models/gemini-2.5-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 in a few words" } ] } ] }'

Meet the models

• 2.5 Pro Our most powerful thinking model with features for complex reasoning and much more
• 2.5 Flash Our newest multimodal model, with next generation features and improved capabilities
• 2.5 Flash-Lite Our fastest and most cost-efficient multimodal model with great performance for high-frequency tasks
• Veo 3 Our state of the art video generation model
• Imagen 4 Our highest quality image generation model that creates stunning visuals
• Gemini Embeddings Our first Gemini embedding model, designed for production RAG workflows

Explore the API

• Native Image Generation Generate and edit highly contextual images natively with Gemini 2.0 Flash.
• Explore long context Input millions of tokens to Gemini models and derive understanding from unstructured images, videos, and documents.
• Generate structured outputs Constrain Gemini to respond with JSON, a structured data format suitable for automated processing.

Start building with the Gemini API

Get started

Sources: [1] Gemini API | Google AI for Developers (overview.md)