gpt4t-lu-test?

I noticed when I was in the playground that a new model had appeared in the regular model selector drop-down, under the 'other' heading, called 'gpt4t-lu-test'. Looking at the model list, it seems it was made available 7 hours ago now. It seems odd; it has a tiny context window (only ~2048 tokens) and a cut-off date of September 2021. Most interestingly, however, is that when the server sends you its list of models, it specifies where you can use each (chat, assistants, freeform, etc.), and this is the *only* model (to my knowledge) listed as both chat and freeform. Unfortunately, even though you can select it in the completions sandbox, you get an error back saying that it isn't allowed, so there's some mix up on their end.

Anyways, like the name implies, it seems to be a version of GPT-4-turbo (and using 0 temperature sampling side-by-side with it give very similar if not identical results), but overall just a bit odd I thought. Do you guys see it too? Any thoughts on what 'lu' might mean?