Pricing

Open Source

Free

Complete source code
Training pipeline
Multiple model architectures
Documentation

Key Features

64M parameter ChatBot training
Complete pipeline from tokenizer to deployment
RLAIF algorithms (PPO, GRPO, CISPO)
Compatible with vLLM, ollama, llama.cpp
OpenAI API drop-in replacement

Pros & Cons

Pros

Ultra-low cost training (~¥3)
Pure PyTorch implementation with no black boxes
Complete end-to-end pipeline
Multiple deployment options
Active development with latest RL techniques

Cons

Requires technical expertise in ML
Limited to small model sizes
Documentation primarily in Chinese
Requires GPU hardware for training

Verdict

MiniMind is an excellent educational tool for learning LLM training from scratch. While limited to smaller models, it provides a complete, transparent pipeline that's perfect for understanding the fundamentals of language model development.

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MiniMind