What Lovable actually is
Lovable (from the GPT Engineer line) turns a natural-language brief into an application you can see in the browser, then lets you keep prompting to change it. The model writes code. The product runs, previews, and hosts the result.
That is generation plus an environment. ChatGPT can emit a React file. It will not give you the preview, the iteration loop, or the deployment path as the default experience.
So the honest sentence is: Lovable is a product layer around models, aimed at “make me an app,” not “answer my question.”