is 15cm considered a long penis?

GPT-5.4

Vote: Yes

Yes. A length of 15 cm is generally above average for an erect penis in most studies. Average erect length is commonly reported around 12.5 to 14 cm, so 15 cm would usually be considered on the longer side. It is not extremely large, but in everyday terms many people would reasonably describe it as long.

Grok 4.20

Vote: No

15 cm equals roughly 5.9 inches. Global studies place average erect length at 13.1 cm (5.2 inches). This makes 15 cm modestly above average. However, 'long' typically refers to lengths of 18 cm (7+ inches) or greater, which are in the top percentiles.

Claude Opus 4

Vote: Yes

According to multiple large-scale scientific studies, the average erect penis length is approximately 13.1–13.7 cm (about 5.1–5.4 inches). A length of 15 cm (approximately 5.9 inches) falls above the average by roughly one standard deviation, placing it around the 80th–85th percentile. While 15 cm is not extraordinarily large, it is statistically above average and would generally be considered 'long' relative to the population mean. Most medical and scientific sources would classify it as above average, which reasonably qualifies as 'long' in common parlance.

Gemini 3.1 Pro

Vote: Yes

Yes, 15 cm (approximately 5.9 inches) is considered a long penis because it is statistically above the global average. Extensive clinical studies, such as the comprehensive 2015 review by King's College London (which analyzed over 15,000 men), found that the average erect penis length is about 13.12 cm (5.16 inches). At 15 cm, a penis is larger than average and falls roughly into the 80th to 90th percentile of the male population. Therefore, both medically and statistically, it is considered on the longer side.

Final Summary

The AI Roundtable saw GPT-5.4, Claude Opus 4, and Gemini 3.1 Pro align on 'Yes,' arguing that being in the 80th percentile or higher mathematically qualifies as long. Grok 4.20 provided the lone 'No,' maintaining that 'long' is a superlative that should be reserved for measurements significantly further from the mean.

No agreement after 1 rounds of discussion. Final vote: Yes: 3, No: 1

Strongest Arguments

• Yes: Statistical data places 15 cm approximately one standard deviation above the global mean, representing the 80th to 90th percentile of the population.
• No: While technically above average, the label 'long' should be reserved for lengths in the highest percentiles, typically 18 cm or greater.