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Training & fine-tuning

Colossal-AI

Software for training and running very large AI models across many graphics cards at lower cost.

Research-backed

What it does

Big AI models are too large for one computer chip, so their work has to be split across many. Colossal-AI provides ready-made ways to do this splitting, so researchers can write code much like they would for a single laptop.

It supports several splitting methods and memory-saving tricks, and its makers say it makes large models cheaper, faster and more accessible to train and run.

The project has been used to build related work, including Open-Sora (video generation) and ColossalChat (a ChatGPT-style training pipeline).

Who it's for

AI researchers and engineers training or fine-tuning large models on clusters of GPUs.

Can I use it without coding?

Developers only. A programming library that needs Python skills and powerful GPU hardware. New to this? Start here.

Can I run it?

Cost
Free, with optional paid extrasThe open-source version is free; the makers also sell a hosted or pro version.
Runs on
Server, Cloud
Computer
Made for servers or data centres
API key
Not needed

Try it

Using Claude Code, Cursor or another AI coding assistant? Paste the prompt and it will walk you through the setup.New to this?

Before you install

  • Only download from the official GitHub page. Copies with similar names exist for many popular projects.
  • License (Apache-2.0): Permissive: free to use, change and share, including for business.
  • More on staying safe

Where people are talking about it