13 Best Open Source ChatGPT Alternatives
A curated collection of the 13 best open source and self-hosted alternatives to ChatGPT in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for ChatGPT in 2026? The top open-source alternative is Proton Lumo — AI chat assistant from Proton that stores conversations with zero-access encryption, never logs chats, and never uses your data to train models..
Other highly rated open-source ChatGPT alternatives include Open WebUI, LobeChat and AnythingLLM.
AI chat assistant from Proton that stores conversations with zero-access encryption, never logs chats, and never uses your data to train models.
AI chat assistant from Proton that stores conversations with zero-access encryption, never logs chats, and never uses your data to train models.
Self-hosted AI platform that connects local and cloud models, extends with Python, and keeps your data under your control.
Self-hosted AI platform that connects local and cloud models, extends with Python, and keeps your data under your control.
A collaborative platform to create, schedule, and operate AI agents that handle long-running tasks, team workflows, and automated jobs without constant oversight.
A collaborative platform to create, schedule, and operate AI agents that handle long-running tasks, team workflows, and automated jobs without constant oversight.
A desktop and self-hostable AI app for chatting with documents, running local LLMs, and using AI agents without writing code or creating an account.
A desktop and self-hostable AI app for chatting with documents, running local LLMs, and using AI agents without writing code or creating an account.
Desktop AI client for Windows, macOS, and Linux that connects 300+ models from 50+ providers, with local storage, a built-in knowledge base, and autonomous agent mode.
Desktop AI client for Windows, macOS, and Linux that connects 300+ models from 50+ providers, with local storage, a built-in knowledge base, and autonomous agent mode.
Chat with multiple AI providers through a single self-hostable interface, with support for custom agents, file uploads, plugins, and multi-user access control.
Chat with multiple AI providers through a single self-hostable interface, with support for custom agents, file uploads, plugins, and multi-user access control.
Jan runs open-source AI models on your own hardware or connects to cloud providers like OpenAI, Anthropic, and Google, keeping your conversations off third-party servers.
Jan runs open-source AI models on your own hardware or connects to cloud providers like OpenAI, Anthropic, and Google, keeping your conversations off third-party servers.
Self-hostable AI assistant that connects to your docs and the web, lets you build agents, schedule automations, and run research with verifiable citations.
Self-hostable AI assistant that connects to your docs and the web, lets you build agents, schedule automations, and run research with verifiable citations.
Leon is an AI-powered virtual assistant that lives on your server, automating tasks and managing your digital life with privacy and customization.
Leon is an AI-powered virtual assistant that lives on your server, automating tasks and managing your digital life with privacy and customization.
Open-source answer engine that dynamically generates UI components while providing AI-powered responses, combining conversational AI with interactive interfaces.
Open-source answer engine that dynamically generates UI components while providing AI-powered responses, combining conversational AI with interactive interfaces.
Open-source cross-platform desktop AI assistant with MCP support and local knowledge base
5ire is an open-source, cross-platform desktop AI assistant that supports the Model Context Protocol (MCP) and local knowledge bases. It provides a sleek, user-friendly interface for interacting with large language models (LLMs) while offering advanced features like tool integration, RAG capabilities, and usage analytics. - MCP Tool Support: Connect to MCP servers for extended functionality like file system access, database interactions, and remote data retrieval via a standardized protocol. - Local Knowledge Base: Parse and vectorize documents (docx, xlsx, pptx, pdf, txt, csv) locally using the bge-m3 embedding model for multilingual RAG capabilities. - Usage Analytics: Track API usage and spending to optimize costs and monitor LLM interactions. - Prompt Library: Create, organize, and reuse prompts with variable support for efficient workflows. - Bookmarking: Save important conversations even if original messages are deleted. - Global Search: Search across all conversations using keywords to quickly find information. - Multi-Provider Support: Works with OpenAI, Azure, Anthropic, Google, Baidu, Mistral, Ollama, and more. - Cross-Platform: Available for macOS (Silicon/Intel), Windows, and Linux. 5ire is fully open-source (Apache 2.0 license) and can be self-hosted. It supports local embedding models and integrates with MCP servers for extended tooling. Installation is available via direct downloads or Homebrew (brew install --cask 5ire).
A mobile app for interacting with private, local large language models that work offline and are optimized for Apple silicon.
A mobile app for interacting with private, local large language models that work offline and are optimized for Apple silicon.
Open-source chat application that lets you interact with multiple AI models in one interface, offering flexible conversations and diverse capabilities.
Open-source chat application that lets you interact with multiple AI models in one interface, offering flexible conversations and diverse capabilities.
About ChatGPT
An AI chatbot, capable of understanding and generating human-like text, assisting in conversations, answering queries, and more.