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Here's what it looks like flat shaded, in cycles, with the settings. i only upped transmission to 1 and roughness down:

enter image description here

Here's what it looks like smooth shaded in cycles: enter image description here

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It looks like maybe your normals are flipped. Check this box.

enter image description here

If your glass looks like this -

enter image description here

Enter Edit Mode, select all with A, press Alt + N and select Recalculate Outside.

Your glass should look a bit better, but it looks to me like you should consider adding some supporting geometry on the top and bottom.

enter image description here

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