Google GenAI SDK | cheapkeyai.com Docs

Google GenAI-compatible is suitable for Gemini SDK, Gemini CLI, and multimodal workflows requiring text, image, audio, or video in the same request.

Installation

npm install @google/genai

Initialize Client

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

const ai = new GoogleGenAI({
  apiKey: process.env.CHEAPKEYAI_API_KEY,
  httpOptions: {
    baseUrl: "https://cheapkeyai.com"
  }
});

const response = await ai.models.generateContent({
  model: "gemini-2.5-flash",
  contents: "Write a pre-deployment testing checklist."
});

console.log(response.text);

Generate Content

const response = await ai.models.generateContent({
  model: "gemini-2.5-flash",
  config: {
    systemInstruction: "You are a technical assistant, reply in English."
  },
  contents: "Explain cache invalidation."
});

const stream = await ai.models.generateContentStream({
  model: "gemini-2.5-flash",
  contents: "Write onboarding documentation for new developers."
});

for await (const chunk of stream) {
  if (chunk.text) process.stdout.write(chunk.text);
}

Multi-turn Chat

const chat = ai.chats.create({ model: "gemini-2.5-flash" });

await chat.sendMessage({ message: "I am building docs." });
const answer = await chat.sendMessage({ message: "Suggest SEO structure?" });
console.log(answer.text);

Vision

const response = await ai.models.generateContent({
  model: "gemini-2.5-flash",
  contents: [{
    role: "user",
    parts: [
      { text: "Read the content in the image." },
      { fileData: { fileUri: "https://example.com/image.png", mimeType: "image/png" } }
    ]
  }]
});

Function Calling

Declare functions in `config.tools` to let the model select functions, then execute them in your app and return results to the conversation. Always validate parameters for critical tools.

Commonly Used Endpoints

Feature	Used For	Notes
models.generateContent	Text, single-turn chat, multimodal	Easiest to integrate.
models.generateContentStream	Return partial results	Suitable for real-time UI.
chats.create	Multi-turn conversation	SDK maintains history in the session.
embeddings	Search/RAG	Normalize input before indexing.
image/TTS	Image and voice	Check supported models and formats.