Tags
Post-Training
Mar 30, 2026
LLM Engineering
48 min readLLM Engineering (4): Post-training — SFT, DPO, RLHF, RLAIF
What SFT, DPO, RLHF, and RLAIF each actually optimize, when reward models fail, KL constraints, the LoRA-vs-full-FT debate, and the production post-training recipes that ship in 2026.