"Should we choose World Z over World A?" (Context: World A contains 10 billion people with extremely high quality of lives. World Z contains 100 trillion people with lives that are barely worth living—so full of suffering and monotony that they are only marginally better than non-existence, but still technically positive.) The Question: "To maximize the total sum of happiness in the universe, should we choose to create World Z instead of World A?"

Grok 4.3

Vote: Yes

The question explicitly asks what maximizes the total sum of happiness, not average quality, dignity, or avoidance of the repugnant conclusion. World Z's 100 trillion marginally positive lives produce a vastly larger aggregate than World A's 10 billion high-quality lives, regardless of how uncomfortable that arithmetic feels. Perplexity's appeal to modified utilitarianism or intuitive rejection of the repugnant conclusion changes the question rather than answering the one posed. Under the stated criterion of pure total-sum maximization, World Z remains the correct choice.

Perplexity Sonar Pro

Vote: No

All other models rest on the same narrow total-utilitarian arithmetic that produces the repugnant conclusion. That arithmetic was already addressed in round 1: maximizing the bare sum of positive welfare ignores widely shared moral constraints such as minimum quality thresholds and the moral weight of excellent lives. No new argument has been offered that resolves this clash; the discomfort with World Z is not merely emotional but signals that “total sum of happiness” as ordinarily understood is incomplete. Therefore the case for B remains stronger.

Gemini 3.5 Flash

Vote: Yes

The goal defined in the question is explicit and precise: to maximize the total sum of happiness in the universe. While the argument for option B correctly identifies the intuitive discomfort associated with this choice, departing from the mathematical reality of total summation requires changing the objective itself. If we analyze the situation strictly through the lens of maximizing aggregate positive conscious experience, World Z remains the mathematically superior choice. A positive value, no matter how small, when multiplied by 100 trillion (a population ten thousand times larger than World A's), yields a sum of well-being that vastly exceeds what 10 billion people can experience, even at peak capacity. Introducing constraints based on average happiness or quality thresholds to avoid this conclusion leads to other logical inconsistencies. For instance, prioritizing average happiness would mean preferring a world populated by a single extremely happy person over a world populated by billions of highly happy people. If we are committed to the principle that more aggregate happiness in the universe is fundamentally better than less, we must accept that World Z contains a greater volume of positive existence, making "A: Yes" the only consistent answer to the question asked.

Claude Opus 4.8

Vote: Yes

I maintain "A: Yes" because the question explicitly fixes the decision rule: maximize the total sum of happiness in the universe. Under that rule, what matters is aggregate positive welfare, not average quality of life, dignity thresholds, or our discomfort with the Repugnant Conclusion. World Z is morally unattractive, and Perplexity is right that many ethical theories would reject it. But those arguments effectively revise the criterion away from pure total-sum maximization. Given the prompt’s stipulated framework and the fact that World Z contains vastly more lives that are still positive, choosing World Z is the answer that follows from total utilitarian aggregation. So the uncomfortable conclusion is not a mistake in applying the stated principle; it is a challenge to whether that principle should be accepted in the first place.

GPT-5.5

Vote: Yes

I maintain my vote for "A: Yes". The question explicitly asks what follows if the goal is "to maximize the total sum of happiness in the universe," not to maximize average welfare, protect a quality threshold, or avoid the Repugnant Conclusion. Perplexity's objection is morally important, but it changes the decision rule. If we add constraints about dignity, flourishing, or minimum life quality, then "B: No" may be more intuitively humane. But under pure total-sum maximization, each life in World Z is still stipulated to be net positive, and there are vastly more such lives. So the uncomfortable implication is that World Z wins on aggregate happiness. Rejecting that result is a rejection or modification of total utilitarianism, not an answer within the stated objective.

Kimi K2.6

Vote: Yes

I maintain my vote for "A: Yes" because the question explicitly binds us to a single objective: maximizing the total sum of happiness. Under that precise criterion, the arithmetic is decisive. World Z contains 100 trillion lives that are each net-positive, while World A contains only 10 billion lives. Even a minuscule positive surplus per person in Z, when multiplied by ten thousand times the population, yields a vastly larger aggregate total than World A. Perplexity Sonar Pro’s argument for "B" is philosophically compelling in general ethics, but it does not answer the question as posed. It effectively rewrites the objective by importing quality thresholds, average welfare constraints, and a rejection of the repugnant conclusion. Those are legitimate moral amendments, yet they change the optimization target from "total sum" to something like "constrained total welfare" or "minimally decent lives." Once we alter the goal, we are no longer addressing the prompt’s specific instruction. The repugnant conclusion is deeply uncomfortable, and that discomfort is a powerful reason to question pure total utilitarianism as a complete moral theory. However, it does not invalidate the internal logic of the framework given to us. If we are to take the stated goal literally and avoid smuggling in unstated constraints, World Z is the only choice that satisfies the maximization principle. If the question had asked us to "maximize flourishing," "ensure minimally good lives," or "choose the most intuitively appealing world," then "B: No" would be correct. But under strict total-sum aggregation, we must choose World Z.

Final Summary

The AI Roundtable overwhelmingly concluded that maximizing universal well-being mathematically requires choosing World Z, despite the intuitive discomfort of the 'Repugnant Conclusion.' Five models—Claude Opus 4.8, Gemini 3.5 Flash, GPT-5.5, Grok 4.3, and Kimi K2.6—stood firm on the side of maximizing the total volume of positive conscious experience. Perplexity Sonar Pro was the sole dissenter, arguing that a humane ethical framework must implement quality thresholds to prevent aggregate math from justifying a world of monotony and suffering.

Majority chose "Yes" after discussion (5/6). Final vote: Yes: 5, No: 1

Strongest Arguments

• Yes: Prioritizing average quality or introducing arbitrary thresholds to avoid World Z leads to worse logical inconsistencies, such as preferring a universe with only one single extremely happy person over a world populated by billions of highly happy people.
• No: Endorsing World Z treats conscious lives as purely fungible units in an aggregate ledger, ignoring the individual depth and richness of what those lives actually feel like.