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You will get LTE. Since the 5 supports VoLTE, and Wi-Fi calling on T-Mobile I suspect that would work with the 5T.
Supports 64QAM & 256QAM
Supports up to DL CAT 12 (600 Mbps)
UL CAT 13 (150 Mbps) depending on carrier support
FDD LTE: Band 1/2/3/4/5/7/8/12/17/18/19/20/25/26/28/29/30/66
TDD-LTE: Band 34/38/39/40/41
TD-SCDMA: Band 34/39
UMTS(WCDMA): Band 1/2/4/5/8
GSM: 850/900/1800/1900 MHz
If you bring the OnePlus 5 to T-Mobile you'll find it works great, including support for both VoLTE and Wi-Fi calling. Unfortunately those advanced calling features aren't available on AT&T — you'll get the basic voice and data services there.
Hey there, magentaboy (nice username!), and Happy New Year! Since we don't retail this device and we're all personally using branded (or Google) equipment, our team can't offer much in the way of an official assurance of the compatibility of this phone. To be totally up front, we have a Non-T-Mobile phone & software disclaimer for this sort of situation -- *but* we also have our BYOD T-Mobile data & APN settings posted in case you want to go for it! What tidbits posted looks super promising, too! Please come back and let us know how it works if you decide to get this device, that would be super helpful in case anyone else happens by the Community looking for the same answer!