FAQ:
> Why not make Julia better? > We think Julia is a great language and it has a wonderful community, but Mojo is completely different. While Julia and Mojo might share some goals and look similar as an easy-to-use and high-performance alternative to Python, we’re taking a completely different approach to building Mojo. Notably, Mojo is Python-first and doesn't require existing Python developers to learn a new syntax.
https://docs.modular.com/mojo/faq/#why-not-make-julia-better
Now :
>We oversold Mojo as a Python superset too early and realized that we should focus on what Mojo can do for people TODAY, not what it will grow into. As such, we currently explain Mojo as a language that's great for making stuff go fast on CPUs and GPUs.
> Julia: Julia is another great language with an open and active community. They are currently investing in machine learning techniques, and even have good interoperability with Python APIs.