Mojo🔥 is now open source

The Mojo team has finally made good on a pledge that's been sitting on their to-do list since May 2023. Last week they pushed out version 1.0 of the language, and today they followed that up by releasing the compiler and toolchain under an Apache 2 license — the kind of permissive terms that let anyone fork, modify, or build a business on top of the code without asking permission.

What's interesting is how much the project's ambitions have shifted along the way. Mojo originally billed itself as a superset of Python, meaning the goal was full compatibility so existing Python code could just run and help bootstrap the new ecosystem. That framing quietly changed around August 2025. The team now says Mojo may or may not ever become a complete Python superset, and they've made peace with that uncertainty.

Part of the reason they're comfortable dropping that promise is AI-assisted coding tools. The Mojo developers point to how well these tools already handle migrating Python code into Mojo, and they're betting that tooling and ecosystem maturity will keep smoothing that path over time. In other words, instead of building compatibility into the language itself, they're leaning on AI assistants to bridge the gap.

So Mojo today stands as its own language rather than a Python clone. It borrows Python's syntax because that's familiar and readable, but it's built with a different mission entirely: making GPU programming less painful. That's a narrower, more specific goal than universal Python compatibility, and it's arguably a more honest one — chasing perfect Python parity while also optimizing for GPU workloads is a tall order for any language to pull off cleanly.