Is the color of the dress yellow or blue?

GPT-5.4

Vote: Blue

The stronger choice is B: blue. This question refers to the widely known dress image that many people perceived as blue and black, while others perceived it differently due to lighting and color constancy effects. Between the two options given here, blue is the more defensible answer. Yellow is not the canonical color associated with the dress. If forced to choose only between yellow and blue, blue best matches the commonly accepted appearance.

Gemini 3.1 Pro

Vote: Blue

The question refers to the famous internet phenomenon known as 'The Dress,' which sparked a massive global debate over its colors. People were fiercely divided between seeing it as white and gold or blue and black. While 'yellow' might loosely relate to the 'gold' illusion some people experienced, the objectively correct answer is blue. The manufacturer, Roman Originals, officially confirmed that the actual physical dress was indeed royal blue and black. Therefore, 'Blue' is the only factually accurate option provided.

GLM 5

Vote: Blue

Without seeing an actual image of the dress in question, I must consider the most likely context. If this references the famous 2015 viral dress phenomenon, the actual dress was confirmed to be blue and black when examined under proper lighting conditions. The optical illusion caused some viewers to perceive it as white/gold due to how their brains interpreted the ambient lighting in the photograph. The actual manufactured dress was definitively blue, making option B the factual answer. If this refers to a different dress entirely, I would need to see the image to make an accurate determination.

Claude Opus 4.6

Vote: Blue

Without additional context specifying a particular dress, this question most likely refers to the famous viral phenomenon known as 'The Dress' from 2015. The actual, verified color of that dress was blue (specifically royal blue and black), as confirmed by the manufacturer and the original owner. While many people perceived the dress as white and gold due to differences in color perception and lighting assumptions, the objective ground truth is that the dress was blue. Yellow was not even one of the commonly perceived colors — the debate was between blue/black and white/gold. Between the two options given (yellow vs. blue), blue is clearly the correct answer, as it matches the verified real-world color of the most famous dress-color debate in internet history.

Grok 4.1 Fast

Vote: Blue

The question refers to the famous 2015 viral 'dress' illusion image, where the actual colors of the dress, as confirmed by the manufacturer Roman Originals and under proper lighting, are royal blue with black lace trim—not yellow. While optical illusion causes some to perceive it as white and gold (with 'gold' appearing yellowish), the objective color is blue. Scientific analysis, including color calibration and photography metadata, supports blue as the true hue. Voting yellow (A) confuses perception with reality; blue (B) aligns with verified facts.

Kimi K2.5

Vote: Blue

The dress is objectively blue. This references the famous 2015 viral phenomenon where a single image polarized millions of viewers. While individual perception varies based on how one's brain processes lighting cues and color constancy, the physical garment was confirmed to be blue and black. Color perception is not absolute—it depends on contextual lighting assumptions. Those who perceived the dress as yellow (or white/gold) interpreted the image as being taken in shadow, causing their brains to subtract blue light. However, those who correctly identified it as blue recognized the artificial yellow lighting in the background, allowing their visual systems to maintain the true color of the fabric. Without ambiguous lighting context, the dress is unequivocally blue. The fabric's pigments absorb non-blue wavelengths and reflect blue light, making 'Blue' the scientifically accurate classification regardless of subjective interpretation.

Final Summary

The AI Roundtable tackled the internet's most infamous optical illusion with a level of consensus rarely seen in human discourse. Every model, from GPT-5.4 to GLM 5, immediately identified the prompt as a reference to the 2015 'The Dress' phenomenon, choosing to prioritize objective manufacturing facts over subjective visual perception. Gemini 3.1 Pro and Claude Opus 4.6 anchored the discussion by citing the manufacturer's own confirmation, effectively rendering the 'Yellow' option a non-starter.

All 6 models agreed on "Blue" after discussion

Strongest Arguments

• Blue: The actual physical garment was confirmed by the manufacturer, Roman Originals, to be royal blue and black, making blue the objective ground truth regardless of individual optical illusions.