BitNet is a high-performance inference framework for 1-bit large language models, specifically the BitNet b1.58 ternary architecture. It provides CPU (x86 with AVX2, ARM with NEON) and GPU (NVIDIA CUDA) backends with custom quantization formats (I2_S, TL1, TL2) that pack ternary weights and use efficient look-up tables and integer matrix multiplication (int8×int2) to achieve significant speedups over full-precision models (1.37–6.17× on CPU). The system is built on a fork of llama.cpp, adding custom GEMM kernels and a Python utility suite for model conversion, embedding quantization, benchmark, and deployment. It includes a CLI interactive mode and an HTTP server for production serving. The repository contains extensive performance benchmarks and configuration tools, making it a production-ready solution for deploying 1-bit LLMs on commodity hardware.