1BitChat v0.1.0 — initial release

First release of 1BitChat: native Windows desktop chat app for Microsoft's BitNet-b1.58-2B-4T.

Download

1BitChat.zip (1.24 GB) — unzip anywhere, double-click 1BitChat.exe. No installers, no dependencies. The BitNet-2B model is bundled.

What's included

• 1BitChat.exe — Windows native launcher (17 MB PyInstaller bundle with pywebview)
• build/bin/ — BitNet.cpp runtime (llama-server.exe + DLLs)
• models/BitNet-b1.58-2B-4T/ — 1.2 GB GGUF model, loads on startup

Features

• Native desktop window (Edge WebView2) — no terminal or browser
• Optional Falcon3-10B-1.58bit download from in-app Settings (4 GB, 32K context)
• OpenAI-compatible API exposable on selected network interfaces with optional Bearer-token auth
• Per-NIC allow-list so you control exactly which networks the API listens on

Requirements

Windows 10/11. Edge WebView2 (preinstalled on Windows 11). No Python, no LLVM, no GPU.

Credits

Built on Microsoft/BitNet and the BitNet-b1.58-2B-4T model.