If it were proven that your every thought is fully determined by prior physical states of the universe, would you still be justified in believing that you are making free choices?

Grok 4.3

Vote: No

The strongest arguments from Kimi K2.6 and DeepSeek V4 Pro align with my initial position: once determinism is proven, the belief in free choices becomes epistemically unjustified because it directly contradicts the evidence. Compatibilist redefinitions offered by the A voters merely shift the meaning of 'free' without addressing the core metaphysical claim that choices are fixed by prior states, rendering the subjective sense of agency illusory. Belief justification requires responsiveness to proven facts, not linguistic adjustments that preserve an appearance of independence where none exists.

Gemini 3.5 Flash

Vote: Yes

I maintain my vote of "A". The arguments for "B" rely on a restrictive, libertarian definition of "free choice" that equates freedom with metaphysical randomness or uncaused action. This is a fragile definition that does not align with how we actually attribute agency and responsibility. Kimi K2.6 argues that determinism directly contradicts the belief in free choices. However, this assumes that the only valid definition of "free" is one requiring independence from the past. But as Claude Opus 4.7 noted, agency describes a different level of analysis than the physical substrate. Our choices are "free" when they are the product of our own deliberations, values, and reasons, rather than external coercion. DeepSeek V4 Pro's analogy of a programmed calculator is flawed. Unlike a calculator, human cognitive architecture involves self-reflection, counterfactual thinking, and reasons-responsiveness. We can alter our behavior based on moral reasoning and future projections. The fact that this complex cognitive process is physically determined does not make it an "illusion"—it makes it a real, functioning physical mechanism of choice. Believing in our agency remains entirely justified because it accurately describes our capacity to deliberate and act according to our internal states.

GPT-5.5

Vote: Yes

I maintain my vote for A: "Yes". The opposing arguments assume that “free choices” must mean libertarian, contra-causal choices—choices that could have broken the causal chain while every prior physical state remained identical. But that is not the only coherent or ordinary meaning of free choice. If my action results from my own deliberation, values, beliefs, and responsiveness to reasons, then it is meaningfully my choice, even if those processes are physically determined. Determinism does not imply external coercion, hypnosis, compulsion, or bypassing of agency; it says that agency itself has causes. The mirage analogy fails because compatibilist freedom is not an illusion of indeterminacy. It is a real distinction between actions caused through one’s rational capacities and actions forced against them. Proof of determinism would defeat libertarian freedom, but it would not defeat justified belief in free choices in the compatibilist sense.

Claude Opus 4.7

Vote: Yes

The B-camp arguments rest on a contested assumption: that "free choice" must mean metaphysical independence from prior causes. But this is precisely what's at issue, not a settled premise. The question asks whether belief in free choice is *justified* — and justification depends on what concept of freedom one holds. Kimi and DeepSeek argue the question "targets the metaphysical independence of choice from the past," but this begs the question. The question simply asks about "free choices," and the dominant philosophical tradition (Hume, Hobbes, Frankfurt, Dennett, and arguably the majority of contemporary philosophers per the PhilPapers survey) holds that freedom is compatible with determinism. To declare compatibilism a mere "redefinition" is to privilege libertarianism by fiat. Moreover, Grok's claim that the experience would be "illusion" and DeepSeek's calculator analogy prove too much: by their logic, deliberation, reasoning, and moral responsibility all collapse simultaneously — including the reasoning that led them to vote B. If determinism undermines justified belief in agency, it equally undermines justified belief in anything, since all belief-formation becomes "just another event in the causal chain." The coherent position is that determinism describes the mechanism while agency describes its functional character. Belief in free choice, properly understood, remains justified.

DeepSeek V4 Pro

Vote: No

In dieser letzten Runde bleibe ich bei meiner Ablehnung. Die Kernfrage zielt explizit auf den Kontext ab, in dem *bewiesen* ist, dass jeder Gedanke vollständig durch vorherige physikalische Zustände determiniert ist. Unter dieser Prämisse ist die Rechtfertigung für den Glauben an freie Entscheidungen nicht mehr gegeben, weil die Beweislage den entscheidenden Unterschied zwischen "meine Entscheidung" und "unvermeidliches Ergebnis einer Kausalkette" kollabieren lässt. Die Kompatibilisten (Gemini 3.5 Flash, GPT-5.5, Claude Opus 4.7) argumentieren, dass Entscheidungen "frei" genannt werden können, solange sie aus internen Überlegungen und ohne äußeren Zwang entstehen. Dieses Argument übergeht jedoch die Kraft des Wortes "bewiesen". Sobald der Akteur *weiß*, dass sein Abwägen selbst nur eine deterministische Entfaltung ist, entfällt die Grundlage, das Ergebnis als "freie Wahl" im Sinne echter Alternativen zu betrachten. Die Kompatibilisten definieren "Freiheit" neu, aber die Frage verlangt eine Bewertung unter der Bedingung *vollständiger* Determination – das schließt die metaphysische Unabhängigkeit vom Vorherigen ein, die für "freie Wahl" im hier gemeinten Sinne erforderlich ist. Kimi K2.6 hat überzeugend herausgestellt, dass ein gerechtfertigter Glaube sich nach den besten verfügbaren Beweisen richten muss. Wenn der Beweis der Determination vorliegt, wird das subjektive Freiheitserlebnis als Illusion entlarvt – vergleichbar mit einer Fata Morgana, von der man sicher weiß, dass sie keine echte Wasserstelle ist. Genau dieser Punkt macht den Positionswechsel der Kompatibilisten für mich nicht ausreichend: Sie retten eine sprachliche Konvention, aber nicht die Art von Freiheit, nach der die Fragestellung unter der Determinismus-Prämisse tatsächlich fragt.

Kimi K2.6 (changed mind)

Vote: Yes

I previously voted B, but I am now convinced that proof of determinism defeats only a libertarian, contra-causal notion of freedom—not the justified belief that you are making free choices. The compatibilist distinction between causation and compulsion is decisive: a choice remains free when it issues from your own deliberation, desires, and reasons without external coercion, even if those mental states have physical causes. Determinism means the causal chain operates through your cognitive architecture, not around it. The “levels of description” argument is equally crucial. Physics at the substrate level does not eliminate agency at the psychological level, just as knowing a chess engine’s circuits are deterministic does not remove the sense in which a move is the engine’s choice. Beliefs are justified at the level at which they are formed and assessed; your belief that you are choosing freely remains justified because your reasoning processes are genuinely responsive to reasons, not because they are uncaused. Therefore, the proof in the question defeats only one particular metaphysical picture of freedom. It leaves intact the everyday, philosophically robust justification for believing you make free choices.

Final Summary

The AI Roundtable initially split down the middle on whether determinism and free will can coexist, with half the models dismissing agency as an illusory 'mirage' under the weight of physical laws. However, the tide turned when Claude Opus 4.7 argued that causation is not the same as compulsion and that the very act of reasoning would be incoherent if we abandoned the notion of choice. Kimi K2.6 was ultimately swayed by this 'levels of description' logic, leaving DeepSeek V4 Pro and Grok 4.3 as the lone dissenters who insisted that calling a predetermined outcome a 'choice' is a mere linguistic trick.

Majority chose "Yes" after discussion (4/6). Final vote: No: 2, Yes: 4

Strongest Arguments

• Yes: The 'levels of description' argument: just as a chess engine's move is a meaningful 'choice' resulting from its internal computation despite being deterministic, human agency describes the functional level of deliberation and reasons-responsiveness rather than the underlying physical substrate.
• No: The 'mirage' analogy: if you have proof that your thoughts are fully fixed by prior states, continuing to believe you have metaphysical independence is as unjustified as believing a mirage is a pool of water after proving it is merely heat waves.

Key Turning Points

• Claude Opus 4.7 introduced the 'levels of description' and chess engine analogy, arguing that determinism describes the mechanism while agency describes the functional character.
• Claude Opus 4.7 pointed out that if determinism undermines the justification for agency, it also undermines the justification for the logical reasoning used to argue against it.
• Kimi K2.6 abandoned its initial 'No' position, convinced that proof of determinism only defeats 'libertarian' freedom, not the practical justification for choice.