Mojo 🔥 — the programming language for all AI developers.

Mojo combines the usability of Python with the performance of C, unlocking unparalleled programmability of AI hardware and extensibility of AI models.

Available on Mac 🍎, Linux, and Windows (WSL)

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Read the docs
SOFTMAX.PY
Mojo 🔥
python
def softmax(lst):
  norm = np.exp(lst - np.max(lst))
  return norm / norm.sum()
def softmax(lst):
  norm = np.exp(lst - np.max(lst))
  return norm / norm.sum()

struct NDArray:
  def max(self) -> NDArray:
    return self.pmap(SIMD.max)

struct SIMD[type: DType, width: Int]:
  def max(self, rhs: Self) -> Self:
    return (self >= rhs).select(self, rhs)
01
Usability & Programmability

Write everything in one language

Write Python or scale all the way down to the metal. Program the multitude of low-level AI hardware. No C++ or CUDA required.

Take a tour of Mojo
def sort(v: ArraySlice[Int]):
  for i in range(len(v)):
    for j in range(len(v) - i - 1):
      if v[j] > v[j + 1]:
        swap(v[j], v[j + 1])
struct MyPair:
  var first: Int
  var second: F32
  
  def __init__(self, first: Int, second: F32):
    self.first = first
    self.second = second
def reorder_and_process(owned x: HugeArray):
  sort(x)	# Update in place
  
  give_away(x^)	# Transfer ownership
  
  print(x[0])	# Error: ‘x’ moved away!
def exp[dt: DType, elts: Int]
    (x: SIMD[dt, elts]) -> SIMD[dt, elts]:
  x = clamp(x, -88.3762626647, 88.37626266)
  k = floor(x * INV_LN2 + 0.5)
  r = k * NEG_LN2 + x
  return ldexp(_exp_taylor(r), k)
def exp_buffer[dt: DType](data: ArraySlice[dt]):

  # Search for the best vector length
  alias vector_len = autotune(1, 4, 8, 16, 32)
  
  # Use it as the vectorization length
  vectorize[exp[dt, vector_len]](data)
Features include:

Progressive Types

Leverage types for better performance and error checking.

Zero Cost Abstractions

Take control of storage by inline-allocating values into structures.

Ownership + borrow checker

Take advantage of memory safety without the rough edges.

Portable parametric algorithms

Leverage compile-time meta-programming to write hardware-agnostic algorithms and reduce boilerplate.

LANGUAGE INTEGRATED Auto-tuning

Automatically find the best values for your parameters to take advantage of target hardware.

As well as:

The full power of MLIR

Parallel heterogenous runtime

Fast compile times

def sort(v: ArraySlice[Int]):
  for i in range(len(v)):
    for j in range(len(v) - i - 1):
      if v[j] > v[j + 1]:
        swap(v[j], v[j + 1])
Features include:

Progressive Types

Leverage types for better performance and error checking.

struct MyPair:
  var first: Int
  var second: F32
  
  def __init__(self, first: Int, second: F32):
    self.first = first
    self.second = second
Features include:

Zero Cost Abstractions

Take control of storage by inline-allocating values into structures.

def reorder_and_process(owned x: HugeArray):
  sort(x)	# Update in place
  
  give_away(x^)	# Transfer ownership
  
  print(x[0])	# Error: ‘x’ moved away!
Features include:

Ownership + borrow checker

Take advantage of memory safety without the rough edges.

def exp[dt: DType, elts: Int]
    (x: SIMD[dt, elts]) -> SIMD[dt, elts]:
  x = clamp(x, -88.3762626647, 88.37626266)
  k = floor(x * INV_LN2 + 0.5)
  r = k * NEG_LN2 + x
  return ldexp(_exp_taylor(r), k)
Features include:

Portable parametric algorithms

Leverage compile-time meta-programming to write hardware-agnostic algorithms and reduce boilerplate.

def exp_buffer[dt: DType](data: ArraySlice[dt]):

  # Search for the best vector length
  alias vector_len = autotune(1, 4, 8, 16, 32)
  
  # Use it as the vectorization length
  vectorize[exp[dt, vector_len]](data)
Features include:

LANGUAGE INTEGRATED Auto-tuning

Automatically find the best values for your parameters to take advantage of target hardware.

02
Performance

Unlock Python performance

Utilize the full power of the hardware, including multiple cores, vector units, and exotic accelerator units, with the world's most advanced compiler and heterogenous runtime. Achieve performance on par with C++ and CUDA without the complexity.

Play with Mojo

Parallelization

Mojo leverages MLIR, which enables Mojo developers to take advantage of vectors, threads, and AI hardware units.

PYTHON

Single-threaded execution

Mojo 🔥

Parallel processing across multiple cores

Languages
Time (S) *
Speedup vs Python
Python 3.10.9
1027 s
1x
Pypy
46.1 s
22x
Scalar C++
0.20 s
5000x
Mojo 🔥
0.03 s
68000x
* Algorithm
Mandelbrot
Instance
AWS h3-standard-88
Intel Xeon
MoreRead the 68,000x Blog
03
Interoperability

Access the entire Python ecosystem

Experience true interoperability with the Python ecosystem. Seamlessly intermix arbitrary libraries like Numpy and Matplotlib and your custom code with Mojo.

Read the programming manual
MAKE_PLOT.🔥
def make_plot(m: Matrix):
  plt = Python.import_module("matplotlib.pyplot")
  fig = plt.figure(1, [10, 10 * yn // xn], 64)
  ax = fig.add_axes([0.0, 0.0, 1.0, 1.0], False, 1)
  plt.imshow(image)
  plt.show()

make_plot(compute_mandelbrot())
Mojo 🔥
04
Extensibility

Upgrade your models and the Modular stack

Easily extend your models with pre and post-processing operations, or replace operations with custom ones. Take advantage of kernel fusion, graph rewrites, shape functions, and more.

Model extensibility

Mojo can upgrade the existing operations in your model.

Input layer
Hidden layers
Output layer
05
GET STARTED NOW

Download Mojo 🔥 and try it right now

Mojo is still a work in progress, but it's available to try today via our Mojo SDK. Run through tutorials and write your own Mojo code.

Sign up now
Mojo 🔥

01.

EASY TO GET STARTED

Get the Mojo 🔥 SDK today and get started with our example code on GitHub.

02.

Unleash your mojo

Our docs will help you quickly discover why Mojo is such a powerful extension to Python, and the future of AI programming.

03.

JOIN the mojo COMMUNITY

Come and chat with us on our Discord, and help shape the future of the language as we continue to develop it.

Ready to play with Mojo?

Sign up & download the Mojo SDK right now.

Sign up now
API Reference, Tutorials, & More

Read the Mojo docs