Mojo🔥 is now open source!

Mojo 1.0 has released its complete compiler, toolchain, and related source code under the permissive Apache 2.0 license with LLVM exceptions, making the general-purpose language fully open source after four years of development with a previously closed compiler. Designed to apply modern compiler and programming-language research to GPUs, AI accelerators, and other advanced hardware, Mojo had already opened its standard library, kernel code, and development discussions before this broader release. The source is available through Modular’s GitHub repository and can be built locally with Bazel, allowing developers to compile Mojo, modify its standard library, and run tests, while a prebuilt nightly compiler option is available for faster use cases. Although the standard library has accepted outside contributions since 2024, contributions to the compiler and tooling are not yet open, with Modular aiming to enable them by the end of the year.

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