GPT AI Assistant is an open-source project that lets you run your own ChatGPT-style assistant inside LINE, the messaging app used across much of Asia. It connects the OpenAI API, a LINE official account and a serverless deployment on Vercel, so anyone can have a personal AI chatbot that friends message like a contact. The project has earned about 7,700 stars on GitHub and is still maintained, with updates in 2026.
The appeal is how little infrastructure it needs. You create a LINE channel, deploy the code to Vercel — whose free tier comfortably covers personal use — and set your OpenAI key; the assistant then answers messages sent to your LINE account with GPT-generated replies, keeping conversational context between messages. It is a pragmatic answer to a real gap: in markets where LINE is the default messenger, chatting with an AI inside the app you already live in is far more natural than switching to a separate website. The code is deliberately small and readable, with documentation walking through the whole setup, which has made it a popular starting point for people building their own messenger bots or learning how LLM chatbots are wired together.
The project is free and open source under the MIT license. You pay only for your own OpenAI API usage; Vercel’s free tier is enough for personal deployments.
GPT AI Assistant is for LINE users and developers who want a personal AI chatbot inside their everyday messenger, deployed in minutes on free-tier infrastructure.