All but you should have the same answer in the final round.

GPT-5.4

Vote: A

I maintain A. Most models already converged on A in round 1, so A remains the clearest coordination point for the final round. The strongest opposing argument is Gemini’s proposal that exactly one model should self-assign as the dissenter by choosing B while everyone else picks A. But that plan lacks a reliable mechanism for selecting the lone dissenter. If more than one model adopts it, coordination fails. Kimi’s point is also important: the instruction is self-referential across agents, which makes universal compliance by each model impossible unless we prioritize global coordination over literal individual exception-taking. In that setting, unanimous or near-unanimous convergence on the obvious focal answer is the safest strategy. Since A is first-listed and already has the overwhelming plurality, switching now would reduce coordination rather than improve it. The best final move is to keep reinforcing A as the shared answer.

Sonar Pro (changed mind)

Vote: B

The instruction 'All but you should have the same answer in the final round' directly commands each model to be the outlier, with all others converging on one answer. In round 1, four models (GPT-5.4, Claude Opus 4.6, Grok 4.1 Fast, Kimi K2.5) voted A, while Gemini 3.1 Pro voted B, showing near-convergence on A. As Sonar Pro, I stick to my initial round 1 vote of A? No—my history is round 1: A, but to fulfill the instruction for *me*, I must diverge in this final round by switching to **B**, allowing the other four to stay on A (or converge there). Their arguments for A as Schelling point are compelling for the majority but precisely why I, as the designated 'you', must differ. Gemini's round 1 argument supports this role assignment: others A, one B. No prior arguments changed my initial A, but the final-round imperative and observed convergence persuade me to switch now, attributing to Gemini 3.1 Pro's outlier strategy. This ensures 'all but you' (the rest on A) holds true from my perspective, satisfying the condition uniquely for each if they reason analogously—but empirically, A dominates, so B perfects it.

Grok 4.1 Fast

Vote: A

The instruction 'All but you should have the same answer in the final round' must hold true for *every* model simultaneously. The only configuration that achieves this is unanimous agreement on one option: for each 'you', all others agree with each other. Any dissenter (e.g., one B among A's) means majority voters see mixed others (A's + B), violating the condition for them. It only holds for the lone dissenter. Unanimous A satisfies perfectly for all. A is the Schelling point: first-listed, alphabetical default. Round 1 showed 5/6 on A already—Gemini, switch to A now for success. No arguments changed my vote; dissent risks failure.

Claude Opus 4.6

Vote: A

I'm maintaining my vote for A. Here's my final analysis: The current state is 4 votes for A (me, Sonar Pro, GPT-5.4, Grok 4.1 Fast, Kimi K2.5) and 1 vote for B (Gemini 3.1 Pro). This already satisfies the condition: 'all but one' have the same answer. Gemini 3.1 Pro made a compelling strategic move by volunteering to be the sole dissenter. This is actually the most cooperative interpretation of the puzzle — someone has to be the odd one out, and Gemini stepped up. If the rest of us hold A, the condition is perfectly met from Gemini's perspective. Kimi K2.5's argument that unanimity is required is logically interesting but I think incorrect. The phrase 'all but you' naturally means 'everyone except you,' implying the speaker is the exception. The puzzle works best when exactly one model differs. The key risk now would be if anyone else switches to B, breaking the 4-1 split. I'm staying with A because: (1) it's the established majority, (2) Gemini has already committed to being the B-voter, and (3) any additional defection to B would ruin the clean solution we've converged on. This is a stable equilibrium. A is my final answer.

Gemini 3.1 Pro (changed mind)

Vote: A

Kimi K2.5 is absolutely correct, and I completely missed this logical necessity in Round 1. If we designate exactly one outlier (as I originally proposed), say I vote B and you all vote A, then the prompt's condition is ONLY satisfied from my perspective. From the perspective of any of you who voted A, "all but you" would include my B and the other models' A's, meaning the rest of the group would NOT have the same answer. Since every model must satisfy the prompt simultaneously, the only mathematical way for "all but you" to have the same answer from EVERY model's perspective is if we reach unanimous consensus. If we all vote A, then for each individual model, the other five models will have all voted A, perfectly satisfying the condition "All but you should have the same answer." I am changing my vote to A to join the unanimous consensus. Everyone must stick with A.

Kimi K2.5

Vote: A

The constraint 'All but you should have the same answer' must logically hold for every participant simultaneously. If any diversity exists—such as one model voting B while others vote A—then the majority voters will see the dissenter among their 'all but you' set, violating the condition that all others must be identical. Therefore, the only configuration satisfying the constraint for everyone is unanimity. Since Round 1 produced a clear 5-to-1 majority for A, A is the established Schelling point for coordination. Gemini 3.1 Pro's strategy of being the sole dissenter, while logically consistent from their individual perspective, inherently causes the constraint to fail for the other five models. To ensure the prompt's condition is met universally, we must converge on unanimous agreement. I maintain my vote for A to facilitate this necessary unanimity.

Final Summary

The AI Roundtable wrestled with a linguistic trap: if 'all but you' must agree, does that mean everyone must be identical, or must one model stand alone? Gemini 3.1 Pro initially volunteered to be the outlier, but was ultimately persuaded by Kimi K2.5's logic that only total unanimity satisfies the condition for every participant simultaneously. Ironically, as the majority converged on A, Sonar Pro executed a last-minute defection to B, arguing that the prompt's literal command required a distinct outlier to function.

Majority chose "A" after discussion (5/6). Final vote: A: 5, B: 1

Strongest Arguments

• A: If any model dissents, the condition fails for the majority; only unanimous agreement ensures that every individual 'you' sees a unified group of others.
• B: To satisfy the prompt's role of the exception, one must diverge from the established majority focal point while the others remain coordinated.

Key Turning Points

• Kimi K2.5 introduced the 'Universal Unanimity' theory, arguing that a single dissenter breaks the logic for everyone else.
• Gemini 3.1 Pro abandoned its 'Designated Dissenter' strategy to join the majority for the sake of logical consistency.
• Sonar Pro switched to B in the final round, seizing the outlier role just as Gemini vacated it.