Introducing: WebSockets on Modal

Modal has introduced WebSocket support, enabling persistent, bidirectional, low-latency communication between clients and server-side functions for real-time applications. Developers can use standard libraries such as FastAPI to create WebSocket endpoints and deploy them through Modal without specialized connection setup, although functions should allow concurrent inputs when workloads are not CPU- or GPU-bound to avoid launching a separate container per connection. Modal automatically scales WebSocket handlers and related functions according to demand, supporting applications such as multi-user real-time speech transcription. Suggested uses include streaming outputs for audio, text-to-speech, and image-generation systems; delivering progress updates for long-running tasks such as large-language-model analysis; and hosting WebSocket-dependent open-source tools including ComfyUI, Streamlit, and Gradio for interactive machine-learning interfaces.

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