Are the Generated Results on This X Does Not Exist Always Realistic?

No. The site itself acknowledges that output quality varies, and realism is not guaranteed. The collection openly notes that some models produce visual deformities, that certain generators are "stranger than the others," and that not every listed site even uses a GAN or deep learning. Realism depends on the model behind each generator and the type of content being produced.

Why the results are not uniformly realistic

This X Does Not Exist is a directory of separate sites, each built by a different creator using a different model. The parent page describes the collection as sites that "sprung up" using generative adversarial networks (GANs) to create "realistic-looking fake versions of almost anything" — but that is the general premise, not a guarantee for every entry.

Because each generator is independent, quality is uneven by design. The page's own descriptions flag this repeatedly.

Where the site itself admits imperfections

Visual deformities

The entry for This Cat Does Not Exist states plainly that "once in a while the cats have visual deformities due to imperfections in the model." It even warns that these can "cause nightmares." This is the clearest admission that output is not always realistic — the failure mode is baked into the model.

Strange or unsettling output

This Waifu Does Not Exist is described as "a little stranger than the others." That is a softer signal, but it points to the same thing: some generators produce results that read as odd rather than convincing.

Not everything is a GAN — or deep learning

The collection is not technically uniform:

• This Resume Does Not Exist uses TextgenRNN, which the page explicitly notes is "not quite a GAN but rather a recurrent neural network (RNN) specializing in text generation."
• This Emotion Does Not Exist "doesn't necessarily use Deep Learning" and instead showcases "a relatively simple model's ability to interpret emotions from facial expressions."

So even within one directory, the underlying technology ranges from StyleGAN to RNNs to simpler models — and realism tracks that range.

Realism varies by content type

The pattern: face generation is the flagship use case, while cats, waifus, resumes, and emotions each carry their own caveats or use different technology entirely.

What this means if you plan to use these outputs

• Treat realism as probabilistic, not guaranteed. A convincing result on one refresh does not mean the next one will be.
• Inspect before relying on any output. The cat generator's deformities are the documented example; assume similar artifacts are possible elsewhere.
• Check what model a given site uses if technical accuracy matters to you — the page distinguishes GANs from RNNs and from simpler models.
• Expect text-based generators to behave differently from image-based ones, since they use different architectures.

The honest summary: This X Does Not Exist is a showcase of what GANs and related models can do, not a promise that every result will fool you. The site's own descriptions are the best evidence for that.