Mojo programming language has been open-sourced under an Apache 2 license, fulfilling a long-standing promise with the release of its compiler and toolchain.
# Mojo🔥 is now open source
Source: [https://simonwillison.net/2026/Aug/18/mojo-is-now-open-source/](https://simonwillison.net/2026/Aug/18/mojo-is-now-open-source/)
18th August 2026 \- Link Blog
**[Mojo🔥 is now open source](https://www.modular.com/blog/mojo-open-source)**\([via](https://lobste.rs/s/01lxuf/mojo_is_now_open_source)\) Mojo🔥 is now open source
The Mojo programming language has been promising an open source release[since May 2023](https://simonwillison.net/2023/May/4/mojo/)\. Last week they[shipped their 1\.0](https://www.modular.com/blog/modular-26-5-mojo-1-0-is-here)and today they have followed through on that original promise, releasing the compiler and toolchain under an Apache 2 license\.
When Mojo first launched the stated goal was to produce a superset of Python, so existing Python code could be used to bootstrap their own ecosystem\. That plan changed[around August 2025](https://forum.modular.com/t/mojo-vision-document-and-roadmap/2187):
> Mojo may or may not evolve into a full superset of Python, and it’s okay if it doesn’t\. We’re encouraged by how well AI\-assisted coding tools already help migrate Python to Mojo today, and we’re confident that future tooling and ecosystem maturity will make this evolution even smoother\.
Today Mojo is its own language, optimized to make GPU programming as painless as possible using syntax inspired by Python, if not 100% compatible with existing code\.
Mojo, a programming language designed for AI accelerators and GPUs, is now fully open source under the Apache 2.0 license, with its compiler and toolchain available on GitHub for development and contribution.
Mojo 1.0 has been fully open-sourced under an Apache 2.0 license, making the AI programming language accessible to developers worldwide. The announcement also includes the launch of Modular Cloud and expanded support for various hardware accelerators.
Mojo, a programming language designed for AI and high-performance computing, will soon become open-source, enabling broader community adoption and contribution.
Modular announces the 1.0 release of the Mojo programming language, offering a stable foundation for developers building libraries, tools, and applications with enhanced features like Python-style lambdas, improved LSP, and memory safety diagnostics.