OS Chat is a free, open-source AI personal assistant that combines 50+ language models with powerful automation capabilities. Deploy background agents, connect your favorite services (Gmail, Calendar, Notion, GitHub), and get things done through natural conversation.

• 🔓 Open Source T3 Chat Alternative - Get all the speed and multi-model access of T3 Chat, but open source, self-hostable, and enhanced with background agents and service integrations
• 🤖 Your AI Personal Assistant - More than chat - deploy background agents, automate workflows, and manage your digital life
• 🔗 Connect Everything - Direct integration with Gmail, Calendar, Notion, GitHub, Slack, and 10+ more services via Composio
• ⏰ Smart Automation - Deploy background agents with email notifications - let your assistant work while you sleep
• 🧠 50+ AI Models - Access the latest from OpenAI, Anthropic, Google, Meta, and more in one interface
• 🎯 Truly Personal - Customize personality traits, personal context, and preferences for tailored interactions
• 🔒 Privacy-First - Open source, self-hostable, with encrypted API key storage

• Smart Background Agents - Deploy AI agents to run one-time, daily, or weekly with timezone awareness
• Email Notifications - Get notified when your background agents complete successfully
• Automated Workflows - Let your AI assistant handle routine work while you focus on what matters
• Execution History - Track and monitor all your background agent runs with detailed logs

• Gmail Integration - Access, read, and manage your email messages directly through chat
• Google Calendar - View, create, and schedule calendar events seamlessly
• Google Drive & Docs - Access files, create documents, and collaborate on projects
• Notion Workspace - Read and write to your Notion pages and databases
• GitHub Management - Manage repositories, issues, and pull requests
• Slack, Linear, X (Twitter) - And 10+ more services

• 50+ AI Models - Access OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Moonshot, Z.AI, MiniMax, and Qwen models
• Multi-modal Support - Text, images, and reasoning across all supported models
• Image Generation - Create high-quality images with GPT Image 1.5, Nano Banana Pro, Imagen 4, and Flux Schnell
• Reasoning Models - View AI thinking process with o3, Claude 4, Gemini Thinking, and DeepSeek R1
• Web Search Integration - Real-time internet search using Exa, Tavily, and Brave APIs

• Smart Organization - Automatic grouping by Today, Yesterday, Last 7 Days, etc.
• Pinned Chats - Keep important conversations at the top
• Chat Branching - Create alternative conversation paths from any assistant message
• Advanced Search - Full-text search across chat history with content snippets
• Data Portability - Export/import chat history with full data control

• Responsive Design - Beautiful interface that works on desktop and mobile
• Theme System - Beautiful light and dark modes with smooth transitions
• Keyboard Shortcuts - Quick access with ⌘+K (search), ⌘+Shift+O (new chat), ⌘+B (toggle sidebar)
• Real-time Streaming - Instant message streaming for immediate responses

• OpenAI: GPT-5.2, GPT-5.2 Pro, GPT-5.1, GPT-5, GPT-5 Mini/Nano, GPT OSS 20B/120B, o3, o4 Mini
• Anthropic: Claude 4.5 Opus, Claude 4.5 Sonnet, Claude 4.5 Haiku (with reasoning)
• Google: Gemini 3 Pro/Flash, Gemini 2.5 Pro/Flash (with thinking)
• Meta: Llama 4 Maverick, Llama 4 Scout
• DeepSeek: V3.2, V3.1, R1 (with reasoning variants)
• xAI: Grok 4.1 Fast, Grok 4, Grok 3
• Moonshot: Kimi K2, Kimi K2 Thinking
• Z.AI: GLM 4.7, GLM 4.6, GLM 4.5 (with thinking)
• MiniMax: M2.1, M2
• Qwen: Qwen3 Coder, Qwen3 235B

• OpenAI: GPT Image 1.5
• Google: Nano Banana Pro, Nano Banana, Imagen 4, Imagen 4 Ultra
• Fal: Flux Schnell

• TanStack Start - Full-stack React framework with SSR
• TanStack Router - Type-safe file-based routing
• TanStack Query - Powerful data fetching and caching
• Vite - Next-generation frontend tooling
• Nitro - Universal server engine
• React 19 - UI library with latest features
• t3-env - Type-safe environment variables with Zod
• Vercel AI SDK v5 - Model integration and streaming
• Convex - Real-time backend, authentication, and database
• Composio - Service integrations (Gmail, Calendar, Notion, GitHub, etc.)
• shadcn/ui - Modern component library for UI
• Framer Motion - Smooth animations and transitions
• Zustand - Lightweight state management
• Cloudflare R2 - Object storage for file attachments
• Tailwind CSS v4 - Utility-first CSS framework
• Ultracite - Lightning-fast linting with Biome

See the Installation Guide for complete setup instructions.

# Clone and install
git clone https://github.com/ajanraj/OpenChat.git
cd OpenChat && bun install

# Set up Convex backend
bunx convex login && bunx convex dev --once

# Configure environment
cp .env.example .env

# Run development server
bun dev

Visit http://localhost:3000 to see OS Chat running locally!

• Projects & Workspaces - Organize your chats into projects and workspaces
• MCP integration - Model Context Protocol support for enhanced AI capabilities
• Stream Resuming - Resume interrupted streams using Redis

We welcome contributions! See the Installation Guide to set up your development environment.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Run bun run lint and bun run format before committing
4. Push to the branch and open a Pull Request

• Stream resuming using Redis
• Performance optimizations
• MCP integration
• Additional service connectors

Current Status: Beta Release - OS Chat is actively developed with regular feature updates.

Compatibility: Built with TanStack Start, Vite, and Nitro for modern full-stack React architecture.

Privacy: All data is processed securely with user control over exports, imports, and data management.

Copyright 2025 Ajan Raj. Licensed under the Apache License 2.0.