OpenArch – PyTorch implementations of modern LLM architectures

OpenArch is a readable, from-scratch PyTorch codebase for many modern open-source LLM architectures, giving IT and AI teams a side-by-side way to understand how models differ in attention, normalization, positional encoding, and MoE design. For CIOs, the business value is faster internal upskilling and more informed model selection, while the strategic benefit is reducing reliance on opaque vendor implementations and improving the organization’s ability to evaluate, prototype, and govern GenAI capabilities. For IT organizations, it provides a practical reference for architecture comparison, technical due diligence, and talent development as LLM adoption moves from experimentation to operational use.