big-AGI is a free, open-source AI suite that gives power users a single polished interface for chatting and working with the world’s leading AI models — GPT, Claude, Gemini, DeepSeek and many more. It has around 7,200 stars on GitHub and is in very active development in 2026.
Rather than juggling separate subscriptions and tabs, big-AGI connects to dozens of model providers through your own API keys and unifies them in one workspace. Its signature Beam feature runs several models on the same prompt in parallel so you can compare answers and merge the best into one. Around the chat core it layers personas for role-specific assistance, text-to-image generation, voice input and output, code highlighting and execution, PDF import, and developer presets. It supports hosted APIs from OpenAI, Anthropic, Google, xAI, DeepSeek and Perplexity as well as local models, and it can be deployed on-premises or in the cloud with data staying under your control. The project is MIT-licensed and free to use.
big-AGI is completely free and open source under the MIT license. You pay only for the third-party model APIs you choose to connect with your own keys.
big-AGI is for AI power users, developers and teams who work across multiple model providers and want one fast, private, feature-rich workspace instead of a pile of separate chat subscriptions.