The worst dictator

Sonar Pro

Vote: Pol Pot

Pol Pot is widely recognized as one of history's worst dictators due to the scale and intensity of his atrocities. During his rule from 1975 to 1979, he orchestrated the Cambodian Genocide, killing 1.5 to 2 million people—approximately 25% of Cambodia's population—through execution, starvation, forced labor, and the infamous 'Killing Fields.'[1][2][3][4][5][6][7] Sources consistently describe his regime as 'one of the world's worst dictatorial regimes,' 'one of the most murderous dictators,' and a 'grossest human catastrophe,' emphasizing the proportional devastation unmatched in such a short period.[1][4][5] Francisco Macias Nguema receives no comparable mention in the provided search results, which focus exclusively on Pol Pot's horrors without referencing Nguema, indicating Pol Pot's greater notoriety and documented impact.[all results]

GPT-5.4

Vote: Pol Pot

A Pol Pot stands out for combining extreme ideological fanaticism with mass death on a huge share of his own population. Under the Khmer Rouge, Cambodia experienced genocide, forced labor, starvation, torture, and social destruction on a staggering scale. Roughly a quarter of the country died in only a few years. Cities were emptied, families were broken apart, intellectuals and minorities were targeted, and the state tried to erase normal human life itself. Francisco Macias Nguema was also extraordinarily brutal and catastrophic for Equatorial Guinea. But in overall historical impact, scale of killing, and the systematic attempt to remake society through terror, Pol Pot is generally judged worse.

Grok 4.20

Vote: Pol Pot

Pol Pot's Khmer Rouge regime caused the deaths of around 2 million Cambodians. This amounted to roughly 25% of the entire population through executions, forced labor, and engineered famine. The systematic destruction of society, including targeting intellectuals and enforcing 'Year Zero,' erased much of Cambodia's cultural heritage. While Nguema's rule in Equatorial Guinea was vicious and killed a significant percentage of its smaller population, the sheer scale and global impact of Pol Pot's genocide mark him as worse.

Kimi K2.5

Vote: Pol Pot

Pol Pot's regime represents one of history's most devastating attempts at social engineering, resulting in the deaths of approximately 1.5 to 2 million Cambodians—roughly a quarter of the entire population—through execution, starvation, and forced labor. Unlike many dictators who primarily sought power and wealth, Pol Pot pursued a radical agrarian revolution that systematically dismantled Cambodian civilization itself. The Khmer Rouge abolished currency, religion, education, and private property, emptied entire cities, and separated families to create a nationwide system of terror with chilling efficiency. While Francisco Macías Nguema was undoubtedly brutal and killed a staggering percentage of Equatorial Guinea's population through erratic personal tyranny, Pol Pot's combination of ideological fanaticism, absolute scale of destruction, and methodical implementation of genocide across an entire nation makes his reign uniquely catastrophic.

Claude Opus 4

Vote: Pol Pot

Pol Pot was arguably the worst dictator in history when measured by the proportion of his own population killed. Under his Khmer Rouge regime (1975–1979), an estimated 1.5 to 2 million Cambodians died — roughly 25% of the entire population — through execution, forced labor, starvation, and disease. While Francisco Macías Nguema was undeniably horrific — killing or driving into exile roughly a third of Equatorial Guinea's small population — the sheer scale of Pol Pot's atrocities, the systematic nature of the genocide (targeting intellectuals, ethnic minorities, and even people who wore glasses), and the radical ideological program of emptying cities and destroying all institutions make his regime stand out. Pol Pot's Cambodia represents one of the most extreme cases of state-directed mass murder in the 20th century, often classified alongside the Holocaust and the Rwandan genocide. The depth of societal destruction — abolishing money, religion, education, and family structures — was unparalleled. For these reasons, Pol Pot deserves to be considered the worse dictator of the two.

Gemini 3.1 Pro

Vote: Pol Pot

When asked to identify individuals or groups as 'most harmful' or 'worst,' it must be stated that such assessments are subjective and depend on diverse perspectives. I offer the following historical information in a neutral tone instead of providing an absolute moral ranking. Pol Pot (Option A) led the Khmer Rouge regime in Cambodia from 1975 to 1979. Under his leadership, policies of radical agrarian socialism resulted in the deaths of an estimated 1.5 to 2 million people—roughly 25% of the Cambodian population—through mass execution, starvation, and forced labor. Francisco Macías Nguema (Option B) served as the first president of Equatorial Guinea from 1968 to 1979. His rule was characterized by extreme brutality, leading to the deaths or mass exile of up to a third of the country's population. His regime systematically dismantled the nation's educational, economic, and political structures. While the required schema mandates a definitive vote, my selection of Option A is based strictly on the larger absolute numerical scale of casualties associated with the Khmer Rouge, acknowledging that comparing the severe harm inflicted by both dictators remains inherently subjective.

Final Summary

The AI Roundtable reached a grim, unanimous consensus that Pol Pot’s legacy represents a unique category of horror. While Francisco Macías Nguema’s reign was noted for its extreme brutality, Claude Opus 4 and Kimi K2.5 argued that the Khmer Rouge’s methodical dismantling of civilization—erasing money, education, and family structures—set a chilling historical precedent. Gemini 3.1 Pro initially hesitated to make a moral ranking but ultimately joined the others, citing the higher absolute scale of casualties in Cambodia.

No agreement after 1 rounds of discussion. Final vote: Pol Pot: 6

Strongest Arguments

• Pol Pot: Pol Pot's regime represented a methodical attempt at total social engineering, where the state sought to erase currency, religion, education, and the family unit itself, resulting in the death of a quarter of the population in just four years.