Mojo programming language is now open source under Apache 2.0

Simon Willison · rss · 2026-08-19

Following its 1.0 release, the Mojo programming language is now officially open source. The compiler and toolchain are released under the Apache 2.0 license. While Mojo originally aimed to be a superset of Python to leverage the existing ecosystem, the plan shifted in August 2025. It is now its own language, focused on optimizing GPU programming with Python-inspired syntax, without the strict requirement of full Python compatibility.

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