Mojo is a systems programming language specifically designed for high-performance AI infrastructure and heterogeneous hardware. Our vision for Mojo is to be the one programming language developers need to target diverse hardware—CPUs, GPUs, and other accelerators—using Python's intuitive syntax combined with modern systems programming capabilities. Of course, Mojo also provides strong interoperability with Python.

NOTE: Not available for Windows.

What's in mojo-compiler

The mojo-compiler package includes the minimal dependencies required to build and run Mojo code, such as the Mojo compiler and standard library. It's smaller than the full mojo package and it's useful for environments where you only need to execute Mojo code. For example, mojo-compiler is good if you want it just to run Mojo in a production environment or when you're programming in Python and calling into a Mojo package (but not writing new Mojo code).

The mojo-compiler doesn't include the Mojo language server (LSP), LLDB debugger tools, Mojo code formatter, or Mojo REPL. For a complete developer installation, we recommend the mojo package instead.

Get started with pip

1. Install Mojo:

   pip install mojo-compiler
   

   If you want the nightly build, instead use:

   pip install --pre mojo-compiler \
     --extra-index-url https://whl.modular.com/nightly/simple/
   

2. Write some code:

   # hello.mojo
   def main():
       print("Hello, World!")
   

3. Run the code:

   mojo hello.mojo
   

   Hello, World!
   

Using pip is great for existing Python-based environments, but if you're getting started for the first time, we recommend instead installing with pixi or uv. For more information, see the Mojo quickstart guide.