Mojo Is Now Open Source: What Developers Should Know
Yes. Modular released the complete Mojo compiler and toolchain under Apache License 2.0 with LLVM Exceptions on August 18, 2026 — one week after Mojo 1.0 shipped. The language is genuinely open source now. The platform is not: MAX, Modular’s inference engine, remains source-available under the Modular Community License. What Actually Changed on August 18, 2026? Modular open-sourced the Mojo compiler and its full toolchain at ModCon 2026, publishing the source under Apache 2.0 with LLVM Exceptions (modular.com). The code landed as a single pull request, modular/modular#6904, titled simply “Open source Mojo,” merged at 2026-08-18T13:29:35Z. The PR body is one character sequence: :). ...