Uploaded January 2026 | Updated September 2026, 2 hours ago

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Day 11/42: What Is RLHF?

Yesterday, we talked about alignment.

But how do we actually teach a model what humans prefer?

That’s where RLHF comes in: *Reinforcement Learning from Human Feedback*.

Instead of just predicting text, the model generates multiple answers.

Humans rank them from best to worst.

The model then learns to favor the kinds of responses people like:

clear, helpful, polite, and safe.

RLHF doesn’t make models smarter.

It makes them *nicer to use*.

Missed Day 10? Start there.

Tomorrow, we look at how instructions are actually sent to a model: prompts.

I’m Louis-François, PhD dropout, now CTO & co-founder at Towards AI. Follow me for tomorrow’s no-BS AI roundup 🚀

#RLHF #AIAlignment #LLM #short