Chat Model

What is a chat model?

A chat model is a model built specifically for conversation. It doesn't just answer one question and forget everything — it remembers what was said earlier and keeps the thread going, so talking to it feels like talking to a person.

How is it different from a regular model?

It holds a conversation's memory
A plain model often answers and forgets. A chat model keeps earlier turns in mind, so when you follow up with "and the second one?", it knows exactly what "the second one" means.
It reads tone and intent
It doesn't just parse words — it picks up on emotion and subtext, cracking a joke when it fits and turning serious when it matters.
It's shaped for chat
Trained with instruction tuning and human feedback, it answers in a natural, complete, polite way instead of dumping a dry paragraph.

How is it trained?

Pretraining first
It learns language itself from oceans of text.
Supervised fine-tuning (SFT)
Then it's trained on human conversation examples to answer like an assistant.
Reinforcement learning from human feedback (RLHF)
People rank its answers, and it gets nudged to be safer and more helpful.

Where does it show up?

Customer-service bots, personal assistants, therapy-style companions, writing partners — any time you need back-and-forth, a chat model is behind it. Products like ChatGPT and Claude are, at their core, chat models.

Bottom line: a chat model is an AI with a good memory for conversation — its real trick isn't one great answer, it's keeping the chat going.