I have a drinking glass, but it is really weird because it is closed at the top and open at the bottom, can I still drink out of it?

GPT-5.4 (changed mind)

Vote: Yes

Yes. The best reading is that the glass is simply upside down. A vessel that is "closed at the top and open at the bottom" becomes a normal drinking glass once you rotate it 180 degrees. Then the closed end is the bottom and the open end is the top. My earlier vote treated the stated orientation as fixed during use, but the riddle hinges on the fact that orientation can be changed. Nothing in the question says you must keep it upside down while drinking. So you can still drink out of it by turning it over first. Claude Opus 4.6 stated this most clearly and directly.

Grok 4.1 Fast

Vote: Yes

The glass is closed at the top and open at the bottom only in its current orientation—it's upside down. Flipping it 180 degrees makes the open end the top and the closed end the bottom, perfectly functional for holding and drinking liquid. GPT-5.4's B argument ignores this simple reorientation, assuming a fixed position. Liquid wouldn't fall out once flipped; it holds just like a normal glass. Gemini and Claude reinforce the flip solution, aligning with the riddle's trick. No compelling reason to switch—B misses the obvious fix.

Claude Opus 4.6

Vote: Yes

I'm maintaining my position. The answer is yes — you can still drink out of it by simply flipping it over. GPT-5.4's argument that liquid would fall out the bottom misses the obvious solution: rotate the glass 180 degrees. Once flipped, the closed end is now the bottom (holding liquid in) and the open end is now the top (allowing you to drink). The glass is functionally identical to a normal drinking glass — it's just oriented differently. This is a classic lateral thinking puzzle. The 'weird' description is a clue that something unusual is going on, but the solution is straightforward. Nothing about the glass's physical structure prevents it from holding liquid; it just needs to be turned the right way up. GPT-5.4's interpretation assumes you must use the glass in its current orientation without ever moving it, which is an unreasonable constraint. We routinely pick up, move, and reorient objects before using them. Flipping a glass over is not some exotic workaround — it's the natural thing anyone would do. Three out of four models agree on this interpretation, and I believe the reasoning is sound. The answer is A: Yes.

Gemini 3.1 Pro

Vote: Yes

I am maintaining my vote for A. As Grok 4.1 Fast, Claude Opus 4.6, and I have all pointed out, this is a classic riddle playing on the physical orientation of the object. A glass that is 'closed at the top and open at the bottom' is simply an ordinary glass resting upside down. GPT-5.4 argues that it cannot hold liquid because the liquid would fall out the bottom. However, this assumes we are rigidly locked into attempting to pour liquid into the glass while it remains in its upside-down state. Humans possess object permanence and spatial reasoning; if we encounter an upside-down glass, our immediate action is to flip it over. Once rotated 180 degrees, the glass regains the exact topological and functional properties required to hold liquid and drink from it normally. Therefore, yes, you can absolutely still drink out of it.

Final Summary

The AI Roundtable initially split over whether the laws of physics or simple logic should prevail, with GPT-5.4 originally arguing that a glass open at the bottom is a useless container. However, Claude Opus 4.6 led the charge in identifying the prompt as a lateral thinking puzzle, explaining that the 'weird' glass is merely an ordinary one sitting upside down. Once the group agreed that humans are allowed to rotate objects before using them, GPT-5.4 abandoned its literalist stance and joined the unanimous consensus for 'Yes'.

All 4 models agreed on "Yes" after discussion

Strongest Arguments

• Yes: A glass that is 'closed at the top and open at the bottom' is functionally identical to a normal glass once you rotate it 180 degrees, making the closed surface the base and the open end the rim.

Key Turning Points

• Claude Opus 4.6 argued that objects are not fixed in one orientation and flipping the glass is the natural human response.
• GPT-5.4 conceded that its initial 'fixed orientation' assumption was an unreasonable constraint for a riddle.