You can train it to display images from the web if you tell it how to build the URL. I've found that it often won't display the image in the preview or dev window, but they do appear when you run the GPT.
One caveat is the output of a Custom GPT (a saved conversation) can't be shared if it contains DALL-E images.
what do you mean? if I say display test.com/test.jpg it will not include a html image tag. or will it render image urls returned from my api? recently it often doesn't even create proper links, just a href=_new and the correct link description. first I thought my gpt triggered some safety mechanism but I've seen working links next to broken links
It is possible to craft the prompt so that it computes and displays the image. It's difficult and appears to almost be a jailbreak. But it is possible and I have seen it working in my own projects.
One caveat is the output of a Custom GPT (a saved conversation) can't be shared if it contains DALL-E images.