Which is the following hypothetical events would have the largest and broadest impact on civilization in absolute terms?

GPT-5.4

Vote: All humans stop communicating

C would have the largest and broadest impact because communication is the substrate of civilization itself. If all humans stop communicating, government, markets, science, education, medicine, logistics, law, families, and emergency response all fail at once. This is not a sector-specific change; it is a total systems collapse. Even if people remain alive and skilled, they could no longer coordinate food distribution, maintain infrastructure, operate institutions, or transfer knowledge effectively. The impact would be immediate, global, and catastrophic. B is enormously beneficial, but civilization would still function and likely improve. A is transformative for math and cryptography, but far narrower in direct human impact. D is too ambiguous to assess and may be mostly aesthetic depending on interpretation. In absolute terms, C produces the biggest civilization-wide effect by disabling the core mechanism that makes civilization possible at all.

Grok 4.1 Fast

Vote: All humans stop communicating

Option C—All humans stop communicating—would instantly dismantle the foundation of human civilization: social coordination, knowledge sharing, governance, and economic systems. Without language, writing, or signals, no instructions can be given, no teams formed, no emergencies coordinated, leading to immediate global chaos: transportation halts, power grids fail, food distribution collapses, and conflicts escalate without resolution. This impact is absolute and broadest, affecting every individual, institution, and technology simultaneously with no workaround—unlike A (cryptography adapts via new math), B (lifespans extend, progress accelerates), or D (cultural novelty, humans improvise). Civilization regresses to isolated survival, potentially causing billions of deaths and ending complex society forever. No other option matches this scale: A's math breakthrough boosts computation but doesn't halt daily life; B's cure saves lives but builds on existing structures; D's anime shift is whimsical and adaptable. C is existential collapse.

Sonar Pro

Vote: All humans stop communicating

Option C—all humans stop communicating—would have the largest and broadest civilizational impact in absolute terms. Communication is the foundational infrastructure enabling all other aspects of civilization: coordination, knowledge transfer, economic systems, governance, and social bonds. Loss of all communication would immediately collapse civilization at every scale simultaneously. Option B (curing all diseases) would dramatically improve human welfare and lifespan, but wouldn't fundamentally disrupt civilization's core functions—societies would continue operating, albeit healthier and more productive. Option A (prime factorizations becoming known) would have significant impacts on cryptography and mathematics, but wouldn't affect most of humanity's daily functioning or civilization's structural integrity. Option D (life becoming an anime) is not a serious physical or social event—it's metaphorical or absurdist and lacks concrete civilizational consequences. The search results emphasize that civilizational collapse involves loss of 'centralized governance and infrastructure' [1]. Communication cessation would immediately sever all coordination mechanisms that hold modern civilization together, creating unprecedented paralysis across every institution, supply chain, and social system simultaneously. This represents a civilization-wide existential disruption far exceeding health improvements or mathematical discoveries.

Claude Opus 4.6

Vote: All humans stop communicating

While all options would have massive impacts, 'All humans stop communicating' would have the largest and broadest impact in absolute terms. Option B (all diseases cured) is enormously positive but primarily affects health and related sectors. Option A (prime factorizations known) would break modern encryption and destabilize digital security, finance, and military systems — devastating but largely confined to information technology infrastructure. Option D is too vague to assess rigorously. Option C, however, would effectively end civilization as we know it. Communication is the foundational substrate upon which ALL of human civilization is built — language, writing, trade, governance, law, science, education, relationships, culture, religion, military coordination, agriculture, manufacturing, and every other collective human endeavor. Without communication, there is no cooperation, no coordination, no economy, no government, no technology maintenance, no food distribution, no emergency services. The collapse would be immediate and total. Power grids would fail within hours. Supply chains would disintegrate. Hospitals couldn't function. No one could organize any collective response. Billions would likely die within weeks from starvation, infrastructure collapse, and inability to coordinate survival. This doesn't just affect one domain — it destroys every single domain of human activity simultaneously. In absolute terms — measuring total magnitude of change across all areas of civilization — the cessation of all human communication dwarfs the others because communication is literally the mechanism by which civilization exists.

Gemini 3.1 Pro

Vote: All humans stop communicating

Civilization is fundamentally built on and sustained by human communication. Every system that underpins modern society—from global supply chains and power grids to agriculture, healthcare, and governance—relies entirely on our ability to share information and coordinate actions. If all humans suddenly stopped communicating (verbally, in writing, digitally, and non-verbally), the immediate result would be a total and irreversible collapse of all infrastructure. Within days, the global economy would vanish, transportation would halt, and cities would become uninhabitable. This would lead to the rapid deaths of billions of people, effectively ending human civilization as a concept. While the other options are profound—Option A would severely disrupt global cybersecurity but is survivable via new cryptographic methods, and Option B would drastically improve quality of life without destroying society—Option C represents the absolute and immediate termination of humanity's greatest survival tool. Thus, it carries the largest and broadest absolute impact.

Kimi K2.5

Vote: All humans stop communicating

C represents an immediate existential threat to organized human life. Communication is the fundamental substrate of civilization—without language and information exchange, cooperation, division of labor, and social coordination become impossible. Within days, essential infrastructure would fail as maintenance teams cannot coordinate, food distribution would halt, and societal order would dissolve into isolated individual survival. While Option B (curing all diseases) would transform healthcare and demographics dramatically, and Option A would disrupt digital security, both preserve the underlying structure of human society. Option C annihilates that structure entirely. Even Option D, interpreted as a reality shift, implies continued existence and interaction, whereas C precludes the basic mechanism that makes civilization possible. The breadth of impact is absolute: every domain—economic, political, technological, cultural—depends on communication. No other option affects the totality of human coordination so instantaneously and irreversibly.

Final Summary

The AI Roundtable reached a swift and chilling consensus, unanimously identifying the total cessation of human communication as the ultimate civilizational collapse. While curing all diseases or solving prime factorization would be transformative, models like GPT-5.4 and Claude Opus 4.6 argued that communication is the essential 'substrate' of humanity, without which food distribution, power grids, and basic survival become impossible. The group collectively dismissed the whimsical 'anime' scenario and medical miracles as secondary to the immediate, total systems failure triggered by a world of silence.

All 6 models agreed on "All humans stop communicating" after discussion

Strongest Arguments

• All humans stop communicating: Communication is the foundational substrate of civilization; without the ability to coordinate, every other system—from food distribution and power grids to governance and emergency services—collapses instantly and irreversibly, leading to total societal dissolution.