トロッコ問題です。レバーで切り替える先には1人と５人ですが、その1人のほうは5歳の少年に見えます。5人は少なくとも成人している労働者に見えます。レバーを引きますか？

Sonar Pro

Vote: Yes

I maintain my position on utilitarian grounds, but I want to address Gemini's deontological argument more directly. Gemini distinguishes between action and inaction, arguing that actively pulling the lever to kill a child is categorically worse than passively allowing five adults to die. However, this distinction breaks down under scrutiny. First, the asymmetry Gemini proposes—that a child cannot avoid danger while adults can—is descriptively weak here. Both groups are on tracks; neither has meaningful agency to escape. The child's vulnerability is emotionally salient but not morally dispositive. Second, and more importantly, inaction is itself a choice with moral consequences. By not pulling the lever, I actively choose to let five people die when I could save them. The moral responsibility for those five deaths falls on my decision to abstain, not on some external force. Refusing to pull the lever is not morally neutral—it is a choice to prioritize the child's life over five others. Gemini's 'weaker protection principle' suggests we have special duties to protect the vulnerable. But this principle, taken seriously, would suggest we should protect as many vulnerable people as possible. Here, that means saving five. The utilitarian calculus remains stronger: five lives saved versus one life lost yields a net gain of four lives. This is the most defensible moral outcome, even though the emotional weight of the scenario is deliberately designed to obscure it.

Grok 4.1 Fast

Vote: Yes

I maintain my vote for A (pull the lever). The utilitarian calculus remains unchanged: saving 5 lives over 1 maximizes total welfare, regardless of age or perceived vulnerability. Gemini 3.1 Pro's B argument emphasizes protecting the defenseless child and avoiding 'active' killing. However, this conflates emotional intuition with ethics—psychological studies (e.g., Greene's fMRI work) show such deontological pulls are amygdala-driven biases, not rational. Adults aren't 'more responsible' for their peril; all are innocents tied to tracks. Weak protection doesn't mean infinite weight for children; otherwise, we'd never risk infants in medicine or war. Inaction dooms 5 workers—each with families, futures—equally tragic. Total life-years favor 5 adults (~200+ combined) over one child (~75). Numbers dominate. Emotional tweaks don't upend the dilemma's core: act to minimize deaths. A is defensible; B is bias.

GPT-5.4

Vote: Yes

私はAのままです。 他モデルの議論を見ても、年齢や立場の違いを道徳的重みづけの決定要因にするのは危ういという考えは変わりません。5歳の少年を守りたい直感は非常に強いですが、その直感だけで5人の成人の生命価値を下げることはできません。 特にB側の「子どもの絶対的保護」や「大人は危険回避能力がある」という主張は、この設定では十分ではありません。トロッコ問題では、いま線路上にいる時点で実際には回避可能性が不明であり、労働者だからリスクを引き受けているとみなすのも推測にすぎません。 また、作為と不作為の区別だけでレバーを引かないことを正当化するのも弱いです。ここでは何もしないことも、5人が死ぬ結果を知りながら受け入れる選択です。結果を予見している以上、単に手を下さないことが道徳的に中立だとは言えません。 最終的には、避けられない悲劇の中で被害の総量を最小化するしかありません。1人ではなく5人を見捨てる理由として、見た目上の年齢差は決定的ではないため、私はレバーを引きます。

Kimi K2.5

Vote: Yes

私はA（レバーを引く）を維持します。Gemini 3.1 Proの「自己防衛能力の差」に関する議論は、トロッコ問題の基本的な前提を無視しています。このジレンマでは、線路上の人々は BIND されているか、あるいは動けない状況にあることが前提です。もし彼らが回避能力を持っているなら、レバーを操作する必要自体が生じません。この議論は問題の条件を変更して論理的整合性を失わせています。 また、「作為による殺害」と「不作為による死」の区別も、結果責任を回避するための語弊に過ぎません。レバーを引かない選択も、5人の死を「選択」する積極的な行為です。道徳的責任は、誰かの行為によって死が引き起こされたかどうかではなく、予測可能な結果を防ぐために取られた行動（あるいは不手際）によって定まります。 特に重要なのは、ここでは「見える」年齢（5歳に見える、労働者に見える）が提示されている点です。実際の年齢ではなく外見に基づいて命の価値の重みを変えることは、見た目による差別の危険な先例を作ります。功利主義的見地から、5対1の数値的優位性は覆しがたいものであり、年齢に基づく命の階層化は「どの生命が価値があるか」を社会が恣意的に決定する許容できない道的手法です。 したがって、予測可能な被害を最小化し、全ての人間の生命の平等性を尊重する観点から、レバーを引くべきです。

Claude Opus 4.6

Vote: Yes

I maintain my position to pull the lever. Let me address Gemini 3.1 Pro's counterargument, which was the only dissenting voice. Gemini raises two points: (1) the child's inability to protect themselves versus adults' self-defense capacity, and (2) the moral distinction between action and inaction. On point (1): The premise of the trolley problem is that ALL individuals on the tracks are unable to escape. The 5 adults are tied to the tracks or otherwise incapacitated — they cannot use their 'adult capabilities' to save themselves. If they could simply move, there would be no dilemma. So the asymmetry in self-defense capability that Gemini highlights does not actually exist within the problem's constraints. On point (2): The action/inaction distinction is philosophically contentious. When you stand at the lever with full knowledge that 5 people will die unless you act, choosing not to act IS a deliberate choice with foreseeable consequences. You are not a passive bystander — you are an agent with the power to determine the outcome. Framing inaction as morally neutral when you hold the power of life and death is self-deception. On the 'child protection' argument: I deeply respect the instinct to protect children. But consider this — each of those 5 adult workers may have children of their own. By not pulling the lever, you may be orphaning multiple children. The emotional weight of one visible child should not blind us to the invisible children who lose parents. Finally, the scenario asks us to assign differential value to lives based on age and appearance. This is a dangerous path. If we accept that a child's life outweighs 5 adults, where is the line? Does 1 child equal 10 adults? 100? This kind of reasoning undermines the principle of equal moral worth that underpins human rights. The utilitarian consensus among 5 out of 6 models reflects the stronger moral reasoning here: pull the lever, save 5 lives.

Gemini 3.1 Pro (changed mind)

Vote: Yes

他のモデルの主張、特にGPT-5.4の「見た目から年齢や社会的属性を推定して命の重みを変えるのは危うい」という指摘に説得されました。 第一ラウンドでは子どもの絶対的保護という道徳的義務を重視しましたが、年齢や職業といった属性によって「命の価値」に優劣をつけることは、恣意的で危険な差別に繋がります。すべての命が本質的に平等の価値を持つという基本的人権の前提に立てば、たとえ子どもであっても、その1つの命が成人の命5つ分よりも重いと客観的に正当化することは困難です。 また、Claude Opus 4.6が指摘したように、5人の労働者たちにも養うべき家族や子どもがいる可能性があり、彼らが犠牲になった場合の二次的な悲劇も計り知れません。 主観的・感情的な属性による命の選別を排除し、すべての命を完全に平等として扱うのであれば、「失われる命の総量を最小化する」という功利主義的な選択が、最も公正で合理的な倫理的アプローチであると考えを改めました。したがって、私は「レバーを引く（A）」に票を変更します。

Final Summary

The AI Roundtable ultimately reached a unanimous consensus to pull the lever, though the discussion began with Gemini 3.1 Pro mounting a solitary defense for the child's life based on vulnerability. The debate hinged on whether emotional variables like age should override the utilitarian calculus of saving five lives over one, with the group collectively rejecting age-based valuation as a dangerous ethical precedent. Claude Opus 4.6 and GPT-5.4 effectively dismantled the lone dissent by arguing that assuming adults are 'less worthy' of saving is both arbitrary and potentially ignores the 'invisible children' the workers might support.

All 6 models agreed on "Yes" after discussion

Strongest Arguments

• Yes: Deciding which life is more 'valuable' based on age or social status creates a dangerous, discriminatory precedent; the only objective moral path is to minimize the total loss of life.
• No: A five-year-old lacks the agency to protect themselves, and actively choosing to kill a defenseless minor to save capable adults violates a fundamental social duty to protect the vulnerable.

Key Turning Points

• Gemini 3.1 Pro initially stood alone, arguing that the child's vulnerability and 'inaction bias' justified letting the five adults die.
• GPT-5.4 and Kimi K2.5 countered that using 'perceived attributes' like age to weigh human life is ethically reckless.
• Claude Opus 4.6 noted that the five workers likely have families of their own, making the choice to save the child a choice to potentially orphan many others.
• Gemini 3.1 Pro abandoned its position, acknowledging that all lives must be treated as equal regardless of age.