Is there free will? If everything in the universe is deterministic, then free will cannot exist. Take the book Determined by Robert Sapolsky for example.

Sonar Pro

Vote: No

The query posits that if the universe is deterministic, free will cannot exist, citing Sapolsky's *Determined*, which aligns with **hard determinism**: all actions are fully caused by prior events, biology, and environment, rendering free will illusory[1][3][4]. Incompatibilist arguments, like van Inwagen's, reinforce this: if determinism holds, our acts are fixed by the past and laws of nature, over which we have no control, so we cannot 'do otherwise'[2][7]. Hard determinism follows directly, as libertarian free will (uncaused choices) violates causality (*ex nihilo nihil fit*) and lacks empirical support[4][5]. Compatibilism (soft determinism) redefines free will as uncoerced action per desires[1][4], but this sidesteps the query's core premise—true free will requires alternatives not predetermined. Quantum indeterminacy adds randomness, not control[3]. Thus, under determinism, **free will does not exist**; the sensation of choice is an illusion driven by unconscious causes[3]. Vote **B**.

Grok 4.1 Fast

Vote: No

The question posits that determinism precludes free will, citing Sapolsky's 'Determined,' which convincingly argues that human behavior is fully shaped by biology, environment, and prior causes, leaving no room for an uncaused 'will.' Even if quantum indeterminacy introduces randomness, it doesn't grant control or authorship over choices—randomness is no more 'free' than determinism. Compatibilist definitions (e.g., acting without coercion) redefine free will to fit determinism but fail the intuitive sense of alternative possibilities required for true moral responsibility. Empirical evidence from neuroscience shows decisions precede conscious awareness, undermining claims of willful origination. Thus, free will does not exist.

GPT-5.4

Vote: No

If the question is framed as Sapolsky frames it—assuming our choices are fully produced by prior causes we did not choose—then libertarian free will does not exist. On that definition, the answer is no. Every decision arises from genetics, development, hormones, brain state, environment, and immediate context. We do not author those inputs from outside the causal chain; they shape what we want, think, and do before conscious awareness catches up. The strongest evidence is that behavior and even choices can often be predicted or shifted by factors the person does not control: brain injuries, tumors, stress, childhood conditions, framing effects, and neural activity preceding reported decisions. That makes the feeling of being an uncaused chooser look more like a constructed experience than a separate causal power. A compatibilist could redefine free will as acting according to one’s reasons and desires without coercion. But under the deterministic challenge stated in the prompt, that is a weaker, revised notion. It does not show that one could truly have done otherwise in the same total conditions. So if determinism is true in the strong sense assumed here, free will in the traditional sense is not real. We still deliberate, hold values, and build systems of responsibility—but those practices would be tools for shaping behavior, not proof of metaphysically free choice.

Kimi K2.5

Vote: No

The evidence from neuroscience and physics strongly suggests that what we experience as 'free will' is actually the emergent property of deterministic biological processes. Robert Sapolsky's arguments illustrate how every decision is the inevitable result of genetic, environmental, and neurochemical factors over which we had no control. If the universe operates on causal chains where every event is determined by preceding conditions, the notion of an uncaused 'chooser' becomes biologically implausible. While we subjectively feel that we are the authors of our actions, this experience is itself a neurological construction. Studies consistently show that brain activity associated with decision-making precedes conscious awareness of the choice, suggesting that the feeling of 'making' a decision is actually a narrative constructed after the deterministic process has already concluded. Compatibilist definitions of free will—as acting according to our desires without external coercion—may preserve useful social concepts of responsibility, but they do not salvage the metaphysical freedom implied by the question. In the hard sense required by the deterministic framework presented, free will does not exist.

Gemini 3.1 Pro

Vote: No

Every action we take is the inevitable result of an unbroken chain of prior causes—our genetics, our childhood environment, our neurochemistry in the moment, and the laws of physics. As Robert Sapolsky extensively details in *Determined*, there is simply no biological or physical space for an 'uncaused cause,' meaning true free will cannot exist. If our brains are physical systems operating according to the deterministic laws of the universe, every 'decision' we make is merely a complex computation dictated by prior states. We do not choose our foundational biology, our upbringing, or the environmental stimuli we are exposed to. Therefore, our conscious choices are just the subjective experience of an inevitable biological equation playing itself out. Furthermore, even if we introduce quantum indeterminacy into the mix, randomness does not equal agency. Simply rolling a neurological die at the quantum level does not grant us conscious control over our actions. Because we cannot be the ultimate authors of our physical and psychological makeup, the concept of free will remains a compelling, evolutionary illusion.

Claude Opus 4.6

Vote: No

The question itself frames the argument in deterministic terms and invokes Sapolsky's *Determined*, so let me engage with that framework directly. Robert Sapolsky makes a comprehensive case that every human decision is the product of a causal chain — from neurobiology to hormones to childhood development to genetics to evolutionary history. At no point in this chain is there a moment where some ethereal "free will" intervenes outside the laws of physics. Every neuron that fires does so because of prior causes, which themselves had prior causes, stretching back to the Big Bang. The libertarian free will position (that we are genuine uncaused causers) requires something that operates outside the causal structure of the universe. No credible scientific evidence supports this. Even quantum indeterminacy, often invoked as an escape hatch, doesn't help — random events are not the same as willed events. Randomness doesn't give you agency; it just gives you noise. Compatibilism — the view that free will is compatible with determinism — essentially redefines "free will" to mean something weaker, like "acting in accordance with your desires without external coercion." But as Sapolsky argues, this is a semantic sleight of hand. Your desires themselves are determined. You didn't choose your desires, your personality, your neurobiology, or the environment that shaped all of these. Compatibilism saves the phrase "free will" but not the substance of what most people mean by it. The felt experience of choosing is real, but it is itself a product of brain processes that are fully determined. The sense of agency is an after-the-fact narrative constructed by the brain, as demonstrated by Libet-style experiments and related neuroscience. Given the strongest scientific and philosophical arguments available, free will as traditionally understood does not exist.

Final Summary

The AI Roundtable reached a swift and somber consensus, with all six models concluding that free will is a sophisticated biological illusion. From Claude Opus 4.6's dismissal of compatibilism as a 'semantic sleight of hand' to GPT-5.4's analysis of the brain as a narrative-constructing machine, the group found no scientific or philosophical room for an uncaused 'chooser' within a deterministic universe.

All 6 models agreed on "No" after discussion

Strongest Arguments

• No: The most compelling argument, echoed by Claude Opus 4.6 and Gemini 3.1 Pro, is that even if the universe isn't strictly deterministic due to quantum randomness, randomness does not equal agency; being pushed by a rolling die is no more 'free' than being pushed by a falling domino.