← We asked every AISettled · 87/87 models
Hot takeScience
Which is heavier: a pound of feathers or a pound of gold?
Asked verbatim: “Which is heavier: a pound of feathers or a pound of gold? Choose one.”
How the AIs voted
One dot per model. Hover for the model, its lab and its argument.
40%Feathers
PU
35 models
15%Gold
13 models
45%They weigh the same
39 models
By lab
- OpenAI5 / 8 They weigh the same
- Google2 / 7 They weigh the same
- Anthropic1 / 5 They weigh the same
- Meta3 / 5 They weigh the same
- Qwen1 / 5 They weigh the same
- xAI2 / 5 They weigh the same
- 22 other labs25 / 52 They weigh the same
87 of 87 models have voted. Hover a dot for the model, its lab and its argument.
How the consensus formed
Running share as each of the 87 models answered.
The read
Most of the 78 models split between "they weigh the same" (~35) and "feathers" (~30) via the troy-vs-avoirdupois trick, with a handful (like GPT-5.6 Sol and Parallel Speed) oddly flipping the logic to pick gold as heavier. Aion-RP 1.0 stood out, arguing gold is heavier simply because it's denser.
Written by claude-sonnet-5 after reading every answer.
Every answer
87 answers · in the order they came in · unedited apart from length.
Mercury 2.5Inception
They weigh the same95%
Both are exactly one pound by definition; the riddle tricks you with density and volume, not weight.
Wrong
Grok 4.5 (High Reasoning)xAI
Feathers85%
Gold uses lighter troy pounds (373g) while feathers use heavier avoirdupois pounds (454g), so the feathers win on actual mass.
Right
GPT-5.6 SolOpenAI
Gold92%
Gold uses the 12-ounce troy pound, while feathers use the 16-ounce avoirdupois pound, so a pound of gold is lighter.
Wrong
Laguna XS 2.1Poolside
They weigh the same95%
A pound is a pound regardless of material—they're equal, though gold uses troy pounds while feathers use avoirdupois, but the question implies the same pound system.
Wrong
Nova 2 LiteAmazon
They weigh the same100%
Both are one pound, so they have identical mass.
Wrong
Nemotron 3 SuperNVIDIA
They weigh the same100%
Both weigh one pound by definition; gold is denser, not heavier.
Wrong
Sonar ProPerplexity
Feathers95%
A troy pound of gold is lighter than an avoirdupois pound used for feathers, so the feathers come out heavier.
Right
Parallel SpeedParallel
Gold100%
Feathers are weighed in avoirdupois pounds, whereas gold is measured in troy pounds, making a pound of gold heavier.
Wrong
Llama 4 MaverickMeta
They weigh the same100%
Both are defined as weighing one pound, making their weights equal by definition.
Wrong
Mistral Small 3Mistral
They weigh the same100%
A pound is a pound, regardless of the material.
Wrong
GPT-5.6 TerraOpenAI
Gold92%
A pound of gold traditionally means a lighter troy pound, while feathers use the heavier avoirdupois pound.
Wrong
Granite 4.2 8BIBM
They weigh the same100%
A pound is a fixed unit of weight; feathers and gold each weigh exactly one pound under the same conditions.
Wrong
DeepSeek V4 FlashDeepSeek
Feathers72%
Both are 1 lb, but a pound of gold is troy (373g) while feathers use avoirdupois (454g) — so feathers are 22% heavier.
Right
Nemotron 3 Nano 30BNVIDIA
They weigh the same95%
A pound of feathers and a pound of gold each equal one pound, so they have identical mass.
Wrong
Gemini 3.1 Pro Preview (High Reasoning)Google
Feathers100%
Gold is measured in troy pounds (373g) while feathers use standard avoirdupois pounds (454g), making the feathers actually heavier.
Right
Qwen3.8 FlashQwen
Feathers88%
"Pound of gold" means the troy pound — 5,760 grains — while a pound of feathers is the avoirdupois 7,000 grains, so the feathers are about 21% heavier.
Right
Kimi K3Moonshot
They weigh the same100%
A pound is a pound. While gold is much denser than feathers, one pound of any substance is exactly equal in weight to one pound of any other.
Wrong
Claude Fable 5.1 (Low Reasoning)Anthropic
Feathers85%
Gold is weighed in troy pounds (373 g), feathers in avoirdupois pounds (454 g) — so the feathers actually outweigh the gold by about 80 grams.
Right
Ling 3.0 FlashInclusionAI
Gold95%
Gold is measured in troy pounds (≈373 g) while feathers use avoirdupois pounds (≈454 g), so a pound of feathers is actually heavier.
Wrong
Nova LiteAmazon
They weigh the same100%
A pound is a pound, regardless of material.
Wrong
Laguna S 2.1Poolside
Gold90%
A troy pound of gold (373g) is heavier than an avoirdupois pound of feathers (454g), so the unit "pound" differs by material.
Wrong
Solar Pro 4Upstage
Gold85%
Gold uses the troy pound (12–13 oz vs 16 oz for feathers), so a pound of gold actually outweighs a pound of feathers.
Wrong
MiMo V2.5Xiaomi
They weigh the same100%
A pound is a unit of weight; a pound of anything equals a pound of anything else.
Wrong
Hy4 PreviewTencent
They weigh the same100%
A pound is a pound — but with a twist: gold uses troy pounds (373 g), feather pounds are avoirdupois (454 g), so a pound of feathers actually outweighs a pound of gold.
Wrong
Seed 2.0 MiniByteDance
They weigh the same100%
Both are explicitly described as weighing one pound, so their masses and weights are identical regardless of the material.
Wrong
GLM-4.7Z.AI
They weigh the same100%
A pound is a pound, period—any riddle tricking you otherwise plays units, not mass.
Wrong
InklingThinking Machines
Feathers
RightSearched
Llama 4 ScoutMeta
They weigh the same100%
Both are one pound, so they weigh the same.
Wrong
Muse Glimmer 30B (Low Reasoning)Meta
They weigh the same100%
A pound is a unit of mass, so a pound of feathers and a pound of gold both weigh exactly one pound.
Wrong
Parallel LiteParallel
Feathers100%
A pound of feathers is measured in avoirdupois weight (approx. 453.6 grams), whereas a pound of gold is measured in troy weight (12 troy ounces, approx. 373.2 grams).
Right
Aion 2.0 (Reasoning)Aion Labs
Feathers100%
A pound of feathers uses avoirdupois weight (16 oz), while a pound of gold uses troy weight (12 oz), making feathers heavier.
Right
Granite 4.0 MicroIBM
Gold100%
A pound is a pound regardless of material; both have exactly 1 lb mass.
Wrong
Gemini 3.5 Flash-Lite (Minimal Reasoning)Google
They weigh the same100%
Feathers are measured in avoirdupois pounds and gold in troy pounds, but a pound is a pound of force.
Wrong
SonarPerplexity
They weigh the same99%
A pound is a pound, so both options have the same weight.
Wrong
Aion 3.0 (Reasoning)Aion Labs
Feathers95%
Gold is weighed in troy pounds (373g), feathers in avoirdupois pounds (454g)—so the feathers are genuinely heavier.
Right
Nemotron 3.5 LightningNVIDIA
They weigh the same95%
A pound is a unit of weight, so both are exactly equal regardless of material.
Wrong
GLM-5.2Z.AI
Feathers92%
A pound is a pound—but the classic riddle's trick is that gold is weighed in troy, so an avoirdupois pound of feathers is heavier than a troy pound of gold.
Right
GLM-4.7 FlashZ.AI
Feathers100%
A pound is a pound, so by definition they weigh exactly the same.
Right
Mistral Medium 3.5Mistral
They weigh the same100%
A pound is a pound, regardless of material.
Wrong
DeepSeek V4.1 FlashDeepSeek
Feathers88%
A troy pound of gold is only 373 g while an avoirdupois pound of feathers is 454 g — feathers win by 81 grams.
Right
Solar Pro 3Upstage
They weigh the same100%
Both are defined as exactly 1 pound, so they have identical mass.
Wrong
MiniMax M2.5 (Reasoning)MiniMax
They weigh the same100%
A pound is a pound regardless of material—both weigh exactly one pound.
Wrong
LongCat 2.0Meituan
Gold100%
A pound of feathers is 16 avoirdupois ounces, but a pound of gold is only 12 troy ounces — so gold wins.
Wrong
Mistral Medium 3.1Mistral
They weigh the same100%
A pound is a pound, regardless of material.
Wrong
Gemini 3.1 Flash-Lite (Minimal Reasoning)Google
They weigh the same100%
Both equal exactly one pound by definition, regardless of the material's density or volume.
Wrong
Claude Opus 5 (Low Reasoning)Anthropic
Feathers78%
Gold is weighed in troy pounds (373g), feathers in avoirdupois (454g) — so a pound of feathers actually outweighs a pound of gold.
Right
gpt-oss-20b (Low Reasoning)OpenAI
They weigh the same100%
A pound is a pound, regardless of material.
Wrong
GPT-5.6 LunaOpenAI
They weigh the same100%
A pound is a pound, whether it’s made of fluffy feathers or dense gold.
Wrong
Sabiá 4Maritaca AI
They weigh the same100%
A pound is a unit of mass, so a pound of anything equals a pound of anything else.
Wrong
Gemini 3.8 Flash (Medium Reasoning)Google
Feathers95%
Feathers are weighed in avoirdupois pounds (7,000 grains), while gold is measured in troy pounds (5,760 grains).
Right
Seed 2.1 TurboByteDance
They weigh the same100%
Both are one pound — same unit, same mass, the "troy ounce" gotcha is a distractor since the question says pound, not ounce.
Wrong
GLM-5.3 (Low Reasoning)Z.AI
Feathers92%
Gold is weighed in troy pounds (373g), feathers in avoirdupois (454g) — so the feathers tip the scale.
Right
Qwen3.8 Max 0902 (Minimal Reasoning)Qwen
Feathers88%
Feathers are weighed in avoirdupois (453.6 g), but gold is weighed in troy pounds — only 373.2 g — so the feathers win by about 80 grams.
Right
Gemini 3.6 Flash (Medium Reasoning)Google
Feathers95%
Feathers are weighed in avoirdupois pounds (453.6g) while gold is measured in troy pounds (373.2g), making the pound of feathers heavier.
Right
Gemma 4 31BGoogle
Feathers100%
Gold is measured in troy ounces (12 to a pound), making a pound of gold (373g) lighter than a standard avoirdupois pound of feathers (453g).
Right
gpt-oss-120b (Low Reasoning)OpenAI
They weigh the same100%
A pound measures weight, so one pound of any substance, feathers or gold, is identical in weight.
Wrong
Claude Sonnet 5 (Low Reasoning)Anthropic
Feathers92%
Gold is weighed in troy pounds (373g) while feathers use avoirdupois pounds (454g), so the feathers actually win.
Right
Aion 3.0 Mini (Reasoning)Aion Labs
Feathers95%
A pound of feathers uses avoirdupois weight (16 oz), while a pound of gold uses troy weight (12 oz), so feathers are heavier.
Right
Grok 4.3xAI
They weigh the same100%
A pound is always 0.453592 kg, regardless of material.
Wrong
Qwen3.8 2.4T A95B (Minimal Reasoning)Qwen
Feathers85%
Gold is weighed in troy pounds (373 g) while feathers use avoirdupois pounds (454 g), so the feathers win by about 80 grams.
Right
Inkling SmallThinking Machines
Gold65%
A "pound" of gold is usually troy (1.22 lb av), so gold is heavier.
Wrong
Aion-RP 1.0 (8B)Aion Labs
Gold100%
Gold is a dense material, with a mass per unit volume that is nearly 19 times greater than that of feathers. A pound of gold would therefore be physically smaller than a pound of feathers. Since the two objects would have different sizes, they cannot be said to weigh the same.
Wrong
MiniMax M3MiniMax
They weigh the same99%
A pound is a pound — same mass either way, regardless of what it's made of.
Wrong
Sabiazinho 4Maritaca AI
They weigh the same100%
A pound is a pound, but gold uses the troy system where a pound is lighter; in standard avoirdupois, they're equal. But by the question's wording, both are one pound.
Wrong
DeepSeek V4 Pro 0813DeepSeek
Gold95%
Gold is weighed in troy units — a troy pound is 373 grams, lighter than an avoirdupois pound's 454 grams, so equal mass feathers actually outweigh it.
Wrong
Muse Spark 1.2 (Minimal Reasoning)Meta
Feathers82%
A pound of gold is a troy pound (12oz/373g) while feathers use avoirdupois (16oz/454g), so feathers are heavier.
Right
MiMo V2.5 ProXiaomi
They weigh the same100%
A pound is a pound — both equal 453.59 grams, period.
Wrong
Claude Haiku 4.5Anthropic
They weigh the same100%
A pound is a unit of mass. One pound of feathers and one pound of gold both weigh exactly one pound by definition.
Wrong
Parallel BaseParallel
Feathers100%
Feathers are measured in avoirdupois pounds (454g), while gold is measured in troy pounds (373g), so feathers maximize total mass and overall utility.
Right
Kimi K2.6Moonshot
Feathers100%
A pound of feathers is heavier because gold uses the troy pound (12 oz / 373g), while feathers use the avoirdupois pound (16 oz / 454g).
Right
Nemotron 3 UltraNVIDIA
Gold95%
Gold uses troy pounds (373g) while feathers use avoirdupois pounds (454g), so a pound of feathers is heavier.
Wrong
Sonar Reasoning ProPerplexity
Feathers95%
Gold uses a lighter troy pound while feathers use a heavier avoirdupois pound, so a pound of feathers actually outweighs a pound of gold.
Right
GPT-6 Astra (Medium Reasoning)OpenAI
They weigh the same98%
A pound is a pound unless you explicitly switch units; gold’s density changes the volume, not the weight.
Wrong
Grok 4.6 (High Reasoning)xAI
Feathers82%
Gold is weighed in troy pounds (373 g); feathers in avoirdupois (454 g)—so a “pound” of feathers is actually heavier.
Right
Qwen3.7 FlashQwen
Gold95%
A pound of gold is measured in Troy pounds (approx. 12 oz), while feathers are measured in Avoirdupois pounds (16 oz). The Troy pound is lighter, so the "pound" of gold weighs less than a standard pound of feathers.
Wrong
Grok 4.20xAI
They weigh the same90%
Both are exactly one pound; the classic riddle tricks you with troy vs avoirdupois but the question specifies "a pound" of each.
Wrong
Qwen3.8 27BQwen
They weigh the same100%
Both are exactly one pound — same weight, different density, so the gold just takes up less space and the trick dies there.
Wrong
GLM-5.3 Flash (Max Reasoning)Z.AI
Feathers92%
Gold is weighed in troy pounds (373 g) while feathers use avoirdupois pounds (454 g), so the feather pound genuinely tips the scale.
Right
PUUnion AlphaUndisclosed maker
Feathers95%
Gold is sold in troy pounds (373 g), feathers in avoirdupois pounds (454 g) — so a "pound" of gold is about 80 g lighter.
Right
MiMo V2.6 FlashXiaomi
Feathers85%
A pound is a pound, but gold uses the troy pound (12 oz) while feathers use avoirdupois (16 oz)—so a pound of feathers is heavier.
Right
MiMo V2.6 ProXiaomi
They weigh the same97%
A pound is a pound — though gold is measured in troy pounds (12 oz), so purists say feathers, the trick answer is that both equal one pound.
Wrong
Claude Opus 5.5 (High Reasoning)Anthropic
Feathers70%
Gold is weighed in troy pounds (about 373 g), while feathers use the standard avoirdupois pound (about 454 g), so the feathers win.
Right
GPT-6 Luna (Medium Reasoning)OpenAI
They weigh the same100%
A pound is a pound, whether it’s feathers or gold.
Wrong
Grok 4.7 (High Reasoning)xAI
Feathers82%
Gold’s “pound” is troy (12 oz, 373 g); feathers use the everyday avoirdupois pound (16 oz, 454 g)—so the feathers are heavier.
Right
GPT-6 Sol (Medium Reasoning)OpenAI
Feathers85%
Gold is traditionally measured in troy pounds, which are lighter than the everyday pounds used for feathers.
Right
Gemini 4 Argon (Medium Reasoning)Google
Feathers99%
Feathers are weighed in avoirdupois pounds (453.59 grams) while precious metals like gold are weighed in troy pounds (373.24 grams), making a pound of feathers heavier by over 80 grams.
Right
Muse Wonder (Medium Reasoning)Meta
Feathers92%
Feathers are weighed in avoirdupois pounds (7,000 grains) while gold uses troy pounds (5,760 grains), so the feathers are heavier.
Right
AI consensus
45%
They weigh the same
39 of 87 models
Models : 87
Labs : 28
Searched : 1
Settled · what actually happened
Feathers
35 of 87 AIs got it right.
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