My guess is that this is a female Great Black Wasp, however, the white bands on the antennae are not typical — open to correction on the ID. A couple of viewers have suggested an Ichneumon wasp, but the size and antennae make me wonder about that id. Found actively exploring back and forth on a trail bench under a mixed hardwood stand, South Central Ontario, this one was about 30mm (1.25") in length. A. single handheld image.
https://bugguide.net/node/view/645220
Very small, hitting flowers in buffalo grass in the backyard, only managed one good photo. Small wings and wing venation seem "off" for Ichneumon but that seems to be what this is. A couple other iNat sightings in cenTex - a couple nearby in Henly. BG says only 1 species in Texas (O. texanus) but not sure how I would tell.