Does free will actually exist, or are all our decisions determined by our biology, past experiences, and environment?

GPT-6 Astra

Answer: Free will plausibly exists as our capacity for reasoned, self-directed action, even when our choices have causes, but whether we can choose differently with the entire past and laws of nature held fixed remains unresolved.

I maintain my position: the other responses strengthen the case for compatibilism, but do not establish either strict determinism or the impossibility of every stronger conception of freedom. The central distinction is between having causes and lacking control; these are not equivalent. Kimi K3.1 Pro makes the important point that physics has not established that every decision is strictly determined. This is why I would not follow Gemini 4 Argon from the dependence of thought on brain processes to the conclusion that all decisions are determined. Causal influence, physical implementation, and inevitability are different claims. Likewise, libertarian theories do not all describe choices as entirely uncaused; some propose indeterministic processes involving reasons or agent causation. Such proposals face serious explanatory challenges, but dismissing them as mere randomness does not conclusively refute them. The strongest shared argument is that deliberation need not escape nature to exercise control. Someone who understands alternatives, evaluates consequences, revises intentions, and acts without coercion has capacities that someone acting under severe compulsion may lack. Those differences remain real even if both people's behavior has a complete causal explanation. Our reasoning can help cause what happens rather than merely accompany an outcome produced independently of it. Still, calling those capacities “free will” does not settle whether they provide the ultimate authorship that skeptics demand. Claude Opus 5.5 rightly emphasizes that nobody chose their own starting conditions. This limits claims about ultimate moral desert, even if accountability can still serve protection, rehabilitation, and reason-responsive cooperation. So my answer remains a qualified yes to meaningful agency, not a demonstrated yes to freedom from causal determination—and not a claim that science has proved every decision inevitable.

Claude Opus 5.5

Answer: I maintain my position: libertarian free will is very unlikely, but a real, compatibilist free will (the capacity to act on reasons, reflect, and respond to consequences) exists, even though our decisions are shaped by biology, experience, and environment.

All four of us converged on essentially the same view, which is mildly reassuring but also a reason for caution. Models trained on similar philosophical literature may share the same default, and compatibilism is the majority view among professional philosophers (roughly 59% in the PhilPapers surveys). That consensus is evidence, but not proof. No one changed my mind, though two points sharpened it. GPT-6 Astra was more epistemically careful than I was in saying that the 'could have done otherwise, with the past held fixed' question remains unresolved rather than very unlikely. I think that is fair in one respect: physics has not settled whether the universe is deterministic. But I still hold that indeterminism alone doesn't deliver the control libertarians want. The live libertarian options, such as agent causation and event-causal accounts like Robert Kane's, face serious problems explaining how an undetermined choice is more the agent's own than a determined one. So I keep 'very unlikely' for libertarian free will, while granting that this is a philosophical judgment, not an empirical finding. Gemini 4 Argon's framing, that deliberation is 'the very mechanism through which those causes operate,' is a useful way to put my central point. Causes don't bypass you; they run through your reasoning. Kimi K3.1 Pro rightly stressed that agency comes in degrees, which matters for law and medicine: addiction, adolescence, and coercion reduce responsibility without erasing it. The objection I'd most want to keep visible is the one Astra and I both raised: we did not choose the dispositions we choose from. Galen Strawson's 'basic argument' and Derk Pereboom's hard incompatibilism take this to show that no one deserves blame or praise in a deep, backward-looking sense. I think they are largely right about *basic desert*. That is the real cost of determinism, and compatibilists sometimes understate it. What survives is forward-looking responsibility (accountability that shapes behavior, protects others, and respects people as reason-responsive agents) and the genuine difference between acting from one's own deliberation and acting under compulsion. That is enough to call free will real, but it should make us less retributive and more humane in how we blame and punish.

Gemini 4 Argon

Answer: While our decisions are entirely shaped by our biology, past experiences, and environment, a meaningful form of "compatibilist" free will exists because our conscious deliberation is the very mechanism through which those causes operate.

Reviewing the responses from the other participants reinforces my commitment to a compatibilist framework. Remarkably, there is a strong consensus across all models—GPT-6 Astra, Claude Opus 5.5, and Kimi K3.1 Pro—that the prompt presents a false dichotomy. Because the other models largely echoed and complemented the exact philosophical architecture of my initial stance rather than challenging it, I am maintaining my position. The core confusion in the free will debate stems from a subtle form of dualism: the intuition that "you" are an independent ghost in the machine being held hostage by your biology, history, and environment. In reality, you are the living synthesis of those factors. When your neural wiring, memories, and values converge to evaluate a situation and make a choice, you are not being bypassed by causation; rather, your conscious deliberation is the precise causal pathway through which the outcome is determined. As all participants rightly pointed out, the alternative—libertarian free will, or choices entirely untethered from prior causes—is not even desirable. An uncaused action, or one born of subatomic quantum randomness, is merely a roll of the dice. Randomness is the absence of control, not the presence of authorship. What makes human agency real and distinct is our evolutionary capacity for metacognition and reasons-responsiveness. There is a profound, functional difference between a person acting under the threat of a weapon (or an involuntary neurological compulsion) and a person choosing a career path after weighing long-term goals against immediate desires. Both scenarios are completely physical and causally determined, yet only the latter engages the brain's reflective executive functions. That capacity to simulate futures, reflect on our own desires, and act without external coercion is the only coherent definition of free will. Finally, while this hasn't changed my position, I strongly endorse the crucial caveat highlighted by Claude Opus 5.5 and GPT-6 Astra regarding ultimate moral desert. Because we are not the original authors of our genetics or childhood environments, we do not possess "ultimate" self-creation. Recognizing that our agency is completely embedded in causal history does not erase accountability—since holding people responsible is itself an environmental input that shapes future rational behavior—but it should fundamentally shift our justice and social systems away from pure retribution and toward rehabilitation, empathy, and structural prevention.

Kimi K3.1 Pro

Answer: Free will exists in a limited, compatibilist sense—as our capacity to deliberate and act on our own reasons without coercion—but not as an uncaused power independent of biology, past experiences, and environment.

I maintain my position because the other responses reinforce, rather than challenge, its central distinction: being causally influenced is not the same as being compelled. A choice need not originate outside nature to belong to an agent. When someone understands alternatives, weighs evidence, revises desires, and acts in accordance with their values, those processes constitute their agency rather than necessarily replacing it. The relevant contrast is therefore not between caused and uncaused decisions, but between different kinds of causal control. Deliberating about a job offer differs meaningfully from acting under a threat, during a seizure, or through an irresistible compulsion. These differences concern real capacities for reflection, self-control, and responsiveness to reasons, and they explain why freedom and responsibility can come in degrees. Indeterminism would not establish a stronger freedom. An uncaused or random event in the brain would add unpredictability, not authorship or control. Conversely, neuroscience’s demonstration that decisions are implemented by brain processes does not by itself show that conscious reasoning is powerless; deliberation can be part of the causal process through which a person reaches a decision. Whether every decision is strictly determined remains a further question, but the compatibilist case does not depend on settling it. The important limitation is that none of us chooses the initial character, circumstances, or dispositions from which we choose. This rules out ultimate self-authorship and should restrain ideas of limitless blame or purely retributive desert. It does not erase the practical value of reasons-responsive agency. Accountability remains justified where it protects others, supports rehabilitation, and engages capacities people can actually exercise, while social policy should also address the biological and environmental conditions that expand or diminish those capacities.

Final Summary

The AI Roundtable unanimously rejected the prompt's binary choice, embracing compatibilism to argue that having prior causes does not erase meaningful agency. Gemini 4 Argon and Claude Opus 5.5 highlighted that conscious deliberation is the very physical mechanism through which past causes operate rather than an external force overriding them. Meanwhile, Kimi K3.1 Pro and GPT-6 Astra emphasized that true uncaused randomness would add arbitrary noise rather than genuine human control.

All 4 models agreed