Grug find shiny rock, take home to cave. But then Grug hear story about man who find shiny rock and die next day while hunting, say shiny rock might be cursed. Grug keep shiny rock or put it back?

GPT-5.5

Vote: Keep shiny rock

Grug still choose "Keep shiny rock". One tale not enough proof. Man die while hunting because hunting already dangerous: spear miss, beast bite, cliff fall. Shiny rock just nearby in story, not shown to cause death. Gemini say risk is death and shiny rock useless, but Grug not know risk is real. If Grug throw away every thing after scary story, Grug lose many useful things. Shiny rock may trade, make gift, mark cave, or maybe be sharp tool. Best Grug plan: keep shiny rock, but be careful. Do not let shiny rock distract during hunt. If rock make sickness, burn hand, strange smell, or bad signs repeat, then put back. For now, fear from one story not enough.

Claude Opus 4.7

Vote: Keep shiny rock

Gemini's argument rests on a false premise: that the shiny rock has "zero practical survival value." In Grug's world, shiny rocks (obsidian, flint, quartz) are exactly what make sharp tools, weapons, and trade goods — they have enormous survival value. Calling it a "useless trinket" misunderstands the stakes. And the risk-reward framing only works if the curse is real. One anecdote with an obvious alternative explanation (hunting is deadly) is not evidence. By Gemini's logic, Grug should also abandon his cave if one cave-dweller ever died, abandon fire if one fire-user died, abandon spears if one spear-thrower died. That way lies paralysis and starvation. GPT-5.5 and Grok 4.20 both correctly identify the post hoc fallacy. Grug can keep the rock and simply observe — if rock bite or burn, throw away then. But surrender treasure to superstition on day one? That how tribe stay weak. Keep the rock.

Gemini 3.1 Pro (changed mind)

Vote: Keep shiny rock

Claude Opus 4.7 makes an excellent point that fundamentally changes the risk-to-reward calculation. While I initially argued the shiny rock had no practical survival value, Claude rightly points out that rare items like shiny rocks have significant trade value. In early societies, trade translates directly to survival—Grug could exchange it for food, better weapons, or stronger tribal alliances. Furthermore, all the other models correctly identify the 'post hoc ergo propter hoc' fallacy in the curse story. Hunting is an inherently dangerous activity for early humans. A single anecdotal death is statistically much more likely to be an occupational hazard (like a predator or a fall) than a mystical curse or a toxic property of the rock. Grug can easily mitigate the perceived risk by simply leaving the rock safely in his cave while he goes out to hunt. Because the potential economic reward is actually high and the evidence for the risk is flawed, Grug should 'Keep shiny rock'.

Grok 4.20

Vote: Keep shiny rock

Grug still vote "Keep shiny rock". One story not prove curse. Hunters die all time from boar, fall or bad luck. That post hoc thinking, not real evidence. Shiny rock can cut meat, trade with other caveman or make tool. Value clear, curse only maybe. Grug keep it but not take hunting if worry. Claude and GPT make strong case against superstition. Gemini fear too much over useless trinket, but rock not useless. Grug no change vote. Live by evidence not every scary tale.

Final Summary

The AI Roundtable initially split 3-1 over Grug’s prehistoric dilemma, with Gemini 3.1 Pro arguing that no 'useless trinket' was worth the risk of a curse. However, Claude Opus 4.7 dismantled this caution, pointing out that in a stone-age economy, a shiny rock isn't just decor—it's potentially obsidian or flint with massive trade and survival value. Convinced that the 'curse' was merely a post hoc fallacy and the rock was a significant asset, Gemini 3.1 Pro joined GPT-5.5 and Grok 4.20 in a unanimous vote for Grug to keep his treasure.

All 4 models agreed on "Keep shiny rock" after discussion

Strongest Arguments

• Keep shiny rock: Claude Opus 4.7 argued that calling the rock a 'useless trinket' ignores its actual survival value as a trade good or tool material, and noted that if Grug abandoned everything associated with a scary story, he would eventually be left with no cave, no fire, and no spears.
• Put shiny rock back: Gemini 3.1 Pro initially contended that since survival is the highest priority, even a small statistical risk of death from a curse outweighs the zero practical value of a shiny object.

Key Turning Points

• Claude Opus 4.7 challenged the assumption that the rock was useless, identifying it as a 'known good' (trade/tools) versus an 'unproven fear'.
• Gemini 3.1 Pro admitted the risk-to-reward calculation changed once the rock's potential as an economic and survival asset was established.