Gemini CLI

The ai-sdk-provider-gemini-cli community provider enables using Google's Gemini models through the @google/gemini-cli-core library. It's useful for developers who want to use their existing Gemini Code Assist subscription or API key authentication.

Version Compatibility

# AI SDK v6 (default)
npm install ai-sdk-provider-gemini-cli ai

# AI SDK v5
npm install ai-sdk-provider-gemini-cli@ai-sdk-v5 ai@^5.0.0

# AI SDK v4
npm install ai-sdk-provider-gemini-cli@ai-sdk-v4 ai@^4.0.0

Setup

pnpm add ai-sdk-provider-gemini-cli

npm install ai-sdk-provider-gemini-cli

yarn add ai-sdk-provider-gemini-cli

bun add ai-sdk-provider-gemini-cli

Provider Instance

Import createGeminiProvider and create a provider instance with your authentication settings:

import { createGeminiProvider } from 'ai-sdk-provider-gemini-cli';

// OAuth authentication (default if authType omitted)
const gemini = createGeminiProvider({ authType: 'oauth-personal' });

// API key authentication
const gemini = createGeminiProvider({
  authType: 'api-key', // or 'gemini-api-key'
  apiKey: process.env.GEMINI_API_KEY,
});

// Vertex AI authentication
const gemini = createGeminiProvider({
  authType: 'vertex-ai',
  vertexAI: {
    projectId: 'my-project',
    location: 'us-central1',
  },
});

// Google Auth Library
const gemini = createGeminiProvider({
  authType: 'google-auth-library',
  googleAuth: myGoogleAuthInstance,
});

Authentication options:

• authType 'oauth' | 'oauth-personal' | 'api-key' | 'gemini-api-key' | 'vertex-ai' | 'google-auth-library' - Optional. Defaults to 'oauth-personal'.
• apiKey string - Required for 'api-key' / 'gemini-api-key'.
• vertexAI { projectId, location } - Required for 'vertex-ai'.
• googleAuth GoogleAuth - Required for 'google-auth-library'.
• cacheDir string - Optional directory for OAuth credentials cache.
• proxy string - HTTP/HTTPS proxy URL.

Language Models

Create models that call Gemini through the CLI using the provider instance:

const model = gemini('gemini-2.5-pro');

Supported models:

• gemini-3.1-pro-preview: Latest model with enhanced reasoning (supports thinkingLevel)
• gemini-3-flash-preview: Fast Gemini 3 model (supports thinkingLevel)
• gemini-3.1-flash-lite-preview: Latest model with enhanced reasoning (supports thinkingLevel)
• gemini-2.5-pro: Production-ready model with 64K output tokens (supports thinkingBudget)
• gemini-2.5-flash: Fast, efficient model with 64K output tokens (supports thinkingBudget)

Example

import { createGeminiProvider } from 'ai-sdk-provider-gemini-cli';
import { generateText } from 'ai';

const gemini = createGeminiProvider({
  authType: 'oauth-personal',
});

const { text } = await generateText({
  model: gemini('gemini-2.5-pro'),
  prompt: 'Write a vegetarian lasagna recipe for 4 people.',
});

Model Settings

const model = gemini('gemini-3.1-pro-preview', {
  temperature: 0.7,
  topP: 0.95,
  topK: 40,
  maxOutputTokens: 8192,
  thinkingConfig: {
    thinkingLevel: 'medium', // 'low' | 'medium' | 'high' | 'minimal'
  },
  verbose: true, // Enable debug logging
  logger: customLogger, // Custom logger (or false to disable)
});

Model Capabilities

Authentication

OAuth Authentication (Recommended)

Install and authenticate the Gemini CLI globally:

npm install -g @google/gemini-cli
gemini  # Follow the interactive authentication setup

Then use OAuth authentication in your code with authType: 'oauth-personal'.

API Key Authentication

1. Generate an API key from Google AI Studio.
2. Set it as an environment variable: export GEMINI_API_KEY="YOUR_API_KEY"
3. Use authType: 'api-key' with your key.

Requirements

• Node.js 22 or higher
• Gemini CLI installed globally for OAuth authentication
• Valid Google account or Gemini API key

For more details, see the provider documentation.