Gradbot: Vibe code voice agents in 50 lines of code
Blog post from Gradium
Gradium launched Gradbot, an open-source framework designed for rapid prototyping of voice agents, in December 2025, building on its high-quality Text-to-Speech and Speech-to-Text models. Gradbot enables developers to create voice experiences with minimal code, using a Rust-based multiplexing engine that synchronizes speech-to-text, language model inference, and text-to-speech in real time, while managing conversational flow and handling interruptions naturally. It is particularly useful for applications like 3D NPC games, travel booking assistants, and various experimental interfaces, thanks to features like voice activity detection, silence management, and asynchronous tool calling that ensure smooth and engaging user interactions. Gradbot is ideal for prototyping innovative voice applications, allowing developers to focus on ideas without the burden of extensive infrastructure setup, while Gradium's models can be utilized for more reliable, scalable production environments through other orchestrators.
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