Modular open-sources the Mojo language

Modular open-sourced the Mojo programming language, releasing the compiler, tooling and everything needed to build the language under Apache 2.0 with LLVM exceptions. The code now lives in Modular’s public GitHub repository. The move follows Mojo’s 1.0 release on August 11, which locked in backward compatibility and API stability, and comes after Qualcomm’s roughly $3.9 billion acquisition of Modular, finalized in late July. Mojo was created by Chris Lattner, the architect behind Swift and LLVM, alongside Tim Davis, and pairs Python-like syntax with systems-level performance and memory safety aimed at CPUs, GPUs and AI accelerators.

What it means for you

Mojo’s pitch has always been that you can write Python-style code that compiles down to performance competitive with C or CUDA, targeting the whole spectrum of AI hardware from one language. The catch, until now, was that the toolchain was proprietary, which is a hard sell for infrastructure teams who do not want a closed compiler under their inference stack. Full Apache 2.0 licensing removes that objection and makes Mojo something you can audit, patch and ship without vendor lock-in. The Qualcomm backdrop is the strategic read: an open Mojo plus Modular’s MAX serving stack is a direct challenge to Nvidia’s CUDA moat, echoing the same open-versus-closed fight playing out in models, from DeepSeek open-sourcing its Claude Code rival to Alibaba’s widely-forked open Qwen releases. If you maintain kernels or serving code, it is now worth a real evaluation rather than a wait-and-see.