Several reports claim that these might be the upcoming Mac models with M2 Max processors.
Two Apple Macs that have yet to be announced are listed in the hardware survey for Steam. These might be the forthcoming devices powered by Apple’s M2 Max processor.

Both of these devices, which were discovered by MacRumors, can be found in Steam’s November 2022 hardware survey under the model numbers “Mac14,6” and “Mac15,4”.
Not only that. Additional identifiers were discovered that fit with several models, including Mac Studio, MacBook Pro, and MacBook Air.
To find out what hardware users on the platform are utilising, Steam performs a monthly survey. The information is used by Steam to “make judgments about what kind of technical investments to make and items to offer,” and participation is optional.
The “Mac14,6” label was recently discovered in a leaked Geekbench listing, which is important because benchmarks there compared the performance of the M2 Max to the M1 Max.
Other information gleaned from the poll listings includes a nearly equal distribution of Macs with Intel and M2 processors, and 8GB RAM seems to be a common combination.
According to the poll, 26% of Mac users run macOS Ventura on their computers. With 48.27 percent of respondents choosing a MacBook Pro, it appears to be a popular option. MacBook Air is closely behind with 29.99 percent of respondents.