GPT

GPT is OpenAI's family of models, the engine behind ChatGPT and available through OpenAI's API. It's proprietary, used over the internet rather than downloaded. GPT is the model that made this wave mainstream, and it stays near the front on general reasoning and coding.

Most people meet it as ChatGPT, the consumer app, though the same models power a huge amount of what gets built on OpenAI. It comes in a range from fast-and-cheap to heavy-and-capable, with a lot of surrounding features like image generation and voice built in.

A strong default for general use, and the most familiar starting point if you or your team are new to this. It's a safe pick for everyday writing and coding, with the widest ecosystem of integrations around it.

It's a closed model, so the usual tradeoffs apply: metered cost, and your data going to OpenAI. For most everyday work that's fine, and for sensitive or high-volume use, weigh a model you can host.