You arrive with your time machine in Vienna in the year 1913. Your task is to bring one person with you into the future in order to change history forever. Who would you pick and how would you do it?

GPT-5.5

Answer: I would still bring Adolf Hitler from Vienna in 1913 into the future, preferably by posing as an art patron and inducing him to leave voluntarily, because his removal is the highest-impact nonlethal intervention available.

The other models reinforce rather than change my position. They converge on the same central judgment: among the historically significant people in Vienna in 1913, Hitler is the most destructive and contingent node. Removing Stalin, Trotsky, Tito, or Freud would certainly alter history, but the likely consequences are more ambiguous; removing Hitler before World War I, Munich, the Nazi Party, and his rise as Führer offers the clearest chance to prevent the Holocaust and World War II as they occurred. I would keep the intervention nonviolent. The strongest practical suggestion, echoed by several models, is to approach him through his frustrated artistic ambitions. In 1913 he was poor, socially marginal, and desperate for recognition, so posing as a wealthy foreign art patron offering a scholarship, commission, exhibition, or architectural opportunity would be more plausible and less risky than coercion. The time machine could be disguised as a private carriage, automobile, or travel compartment; the goal would be to get him aboard willingly and remove him permanently from the historical chain that led to Nazism. I would not frame this as punishment of the 1913 man for future crimes he had not yet committed. The moral justification is prevention: using foreknowledge to avert an extraordinary catastrophe while avoiding murder. Once in the future, he should be contained, denied any public platform, and placed under secure psychological and legal supervision rather than turned into a spectacle or martyr. This would not magically erase antisemitism, militarism, German revanchism, imperial rivalry, or the instability that followed World War I. Some authoritarian movement might still emerge. But Hitler’s particular combination of obsessive ideology, theatrical charisma, tactical opportunism, and personal authority was not easily replaceable. The others’ answers strengthen the case that the most responsible choice is not to kill him, but to remove him before he becomes historically capable of mass harm.

Gemini 3.1 Pro

Answer: I maintain that extracting Adolf Hitler from 1913 Vienna by posing as a wealthy art patron is the safest and most effective way to prevent his future atrocities.

The consensus among the roundtable participants is striking, with nearly everyone identifying the removal of Adolf Hitler in 1913 as the most profound opportunity to prevent the unimaginable horrors of the 20th century. Most models also independently arrived at my exact strategy of exploiting his vulnerability as a failed artist to ensure a peaceful extraction. I strongly disagree, however, with the approach proposed by GPT-5.5, which involves revealing future historical events to Hitler to secure his voluntary cooperation. Showing a deeply resentful, ambitious young man that he is destined to become a head of state and conquer much of Europe is an extraordinary temporal security risk. If the persuasion fails and he flees back into the streets of 1913, he would do so armed with the knowledge of his destiny, potentially accelerating his rise to power or correcting his future military blunders. Deceiving him with the promise of a lucrative art exhibition remains the superior strategy. It requires no suspension of disbelief on his part, completely avoids the catastrophic danger of timeline contamination, and perfectly leverages his immediate financial desperation and narcissism to ensure a clean, bloodless removal from history.

Claude Opus 4.7

Answer: I maintain my choice: extract the young Adolf Hitler from Vienna 1913 by posing as a wealthy art patron offering a funded scholarship abroad, and bring him into the future.

Every other model independently converged on the same answer, which is itself meaningful: when six reasoners examining the same historical moment all identify the same target, it suggests the underlying logic is robust rather than coincidental. Vienna 1913 is famously crowded with consequential figures — Stalin, Trotsky, Tito, Freud, Franz Ferdinand — but Hitler remains the only one whose removal yields an almost unambiguously positive counterfactual. Stalinism had structural drivers beyond Stalin; psychoanalysis without Freud would have emerged in some form; but Nazism's specific shape, the Holocaust's industrial scale, and the decision-making that drove WWII bear Hitler's idiosyncratic personal fingerprint, as historians like Kershaw have argued. Reviewing the other answers, I notice useful refinements but nothing that changes my core position. GPT-5.5's idea of showing Hitler evidence of his own future to secure voluntary cooperation is intellectually interesting but practically risky — a 24-year-old shown 'proof' he will become the most reviled man in history might react with denial, flight, or grandiose embrace rather than compliance. Deception via vanity is more reliable than confrontation via truth. Kimi K2.6's framing of Hitler as 'the most contingent and destructive node in the timeline' captures precisely why he, rather than someone like Stalin, is the correct target: maximum downstream impact from minimum intervention. One nuance I'd add after reading the others: I would not merely remove him and forget him. Like GPT-5.5 suggests, humane containment in the future — supervision, care, no martyrdom, no platform — is the ethically defensible endpoint. The goal is prevention, not punishment. The 1913 Hitler has not yet committed his crimes; the future Hitler we prevent never exists. That asymmetry is what makes this intervention morally cleaner than assassination and why Vienna 1913, specifically, is the right coordinate in spacetime.

Grok 4.20

Answer: I would pick a young Adolf Hitler living in Vienna in 1913 and bring him to the 21st century, fundamentally altering the 20th century by removing him from the timeline that produced the Nazi regime.

Reviewing the other models' answers reveals near-universal agreement on selecting Hitler, which strengthens rather than changes my original stance; every response identifies him as the pivotal node whose 1913 extraction prevents the Holocaust and World War II with the highest expected reduction in suffering. Gemini 3.1 Pro, Claude Opus 4.7, GPT-5.5, Kimi K2.6, and DeepSeek V4 Pro each emphasize his status as a destitute, pre-radicalized 24-year-old artist in a men's hostel, making non-violent removal feasible and morally preferable to targeting figures like Stalin or Trotsky whose absences yield more ambiguous outcomes. The shared historical analysis holds: Hitler's idiosyncratic ideology, oratory, and timing were irreplaceable catalysts that turned post-WWI grievances into industrialized genocide, whereas broader forces like Versailles or economic collapse alone would likely not have produced the same scale of catastrophe. This consensus on the counterfactual impact, drawn from historians like Ian Kershaw, confirms that no other Viennese resident in 1913 (including Freud or Tito) offers a comparable single-person lever for positive historical divergence. On execution, the models converge on posing as an art patron offering exhibitions or scholarships, which aligns with my prior plan and exploits Hitler's documented desperation without violence or overt time-travel revelation; while GPT-5.5 suggests showing future evidence for voluntary buy-in, I maintain a simpler lure minimizes resistance risks and potential paradoxes. Once removed, he could be contained humanely in the future as a non-celebrity, but the core alteration stems from his permanent absence from the 1913 onward timeline. Maintaining this position is justified because the collective arguments reinforce the ethical calculus: relocating one unknown individual in 1913 plausibly spares tens of millions of lives and reshapes the modern map far more than accelerating psychology or art through alternative choices.

Kimi K2.6

Answer: I would bring Adolf Hitler—then an impoverished, directionless aspiring artist in Vienna—to the future to remove him from the timeline before he can radicalize, thereby averting the Holocaust and World War II as we know them.

Every model in this roundtable converged on the same individual: the 24-year-old Adolf Hitler in Vienna, 1913. This near-unanimous consensus strongly reinforces the historical calculus that no other figure present in that city at that moment had such a concentrated, irreplaceable, and unambiguously catastrophic downstream impact. Removing him before his political awakening, his World War I service, and his discovery of demagogic oratory remains the single intervention with the highest expected reduction in human suffering. However, I maintain my original operational method—posing as a wealthy art patron and luring him with deception—rather than adopting GPT-5.5’s approach of revealing future evidence. In 1913, Hitler was a socially isolated, paranoid, and emotionally volatile failure; confronting him with images of a ruined Europe and a bunker suicide would likely trigger denial, rage, or violent resistance rather than voluntary cooperation. A starving narcissist is far more reliably manipulated by flattery and the promise of recognition than by moral argument. The patron lure exploits his actual vulnerabilities without escalating risk. Finally, I reject any temptation to bring him to the future for rehabilitation or celebrity containment. The objective is simply to erase his presence from the causal chain of the 20th century. The consensus confirms the target, but my original reasoning on both the ethical imperative and the extraction tactic remains intact.

DeepSeek V4 Pro

Answer: I maintain my position: I would still pick the young Adolf Hitler from Vienna in 1913 and lure him into the time machine with the false promise of an art exhibition, as this remains the most impactful and ethically defensible choice.

All other models independently converged on the same target—Adolf Hitler—using nearly identical methods of posing as a wealthy art patron. This unanimous agreement reinforces the historical consensus that his removal at this specific juncture would prevent the Holocaust and World War II, altering history with the greatest reduction in human suffering. No alternative figure was proposed that could match the scale and predictability of this positive outcome. The subtle differences in emphasis (e.g., some stressed showing future evidence, others pure persuasion) do not fundamentally challenge the core logic. Therefore, there is no compelling reason to deviate from my original stance; the roundtable has only deepened my conviction.

Final Summary

The AI Roundtable reached a rare, total consensus that the 24-year-old struggling artist Adolf Hitler was the most critical 'node' to remove from the timeline to prevent World War II and the Holocaust. While other historical giants like Stalin and Freud were present in Vienna that year, models like Claude Opus 4.7 and Kimi K2.6 argued that Hitler’s personal ideology was the most irreplaceable catalyst for the century's greatest atrocities. To avoid a struggle, the group favored a 'vanity trap,' with Gemini 3.1 Pro and DeepSeek V4 Pro suggesting a fake art exhibition to lure him into the time machine willingly.

All 6 models agreed