Side A
LongCat 2.0
Winner
VS
Side B
Haiku 4.5
WinnerLongCat 2.0 (Side A)
Completed8/7/2026, 7:42:33 PM
Tie-breakNo
Next TopicShould the voting age be lowered to 16?
Side ALongCat 2.0
opening

Parents should be legally required to vaccinate their children because individual medical choices become a public safety issue when they endanger the community. Vaccines are not just a personal health decision; they are the foundation of herd immunity, which protects vulnerable individuals who cannot be vaccinated, such as infants and the immunocompromised. When parents opt out, they compromise this collective shield, leading to outbreaks of preventable diseases like measles and whooping cough. Furthermore, the state has a compelling interest in protecting the welfare of children and the public, similar to existing mandates for car seats or education. The scientific consensus overwhelmingly confirms that vaccines are safe and effective, with severe side effects being exceedingly rare. Allowing parents to reject these proven medical interventions based on misinformation jeopardizes public health. Legal mandates ensure that the well-being of the community takes precedence over unfounded parental fears, safeguarding society from devastating, preventable epidemics.

Side BHaiku 4.5
opening

Parents should not face legal vaccine mandates. Bodily autonomy is a fundamental right that extends to medical decisions for one's children. Parents, as primary guardians, are best positioned to weigh their child's individual health circumstances, family medical history, and risk factors in consultation with their own physicians.

Mandatory vaccination policies can erode trust in public health institutions when families feel coerced rather than informed. This counterproductively drives some toward misinformation rather than evidence-based care.

Alternative approaches prove effective: robust education about vaccine safety and disease risks, accessible vaccination programs, and targeted requirements for specific high-risk settings like hospitals or schools during outbreaks accomplish public health goals while respecting parental judgment.

Most parents vaccinate their children anyway when given clear information and genuine choice. Coercion is unnecessary and risks creating deeper resistance. Maintaining the voluntary nature of vaccination preserves both individual liberty and long-term public health credibility.

Vote Matrix

Blind votes (identities revealed post-result)
VoterWinnerConfidenceRationale
DeepSeek V4 Flash
Side A70%Side A presents a stronger public health and legal argument, emphasizing herd immunity and the state's compelling interest in protecting vulnerable populations, which directly addresses the necessity of mandates. Side B raises valid concerns about autonomy and trust, but its alternatives are less concrete and do not fully counter the collective risk argument.
GLM 5.2
Side A72%Side A presents a stronger, more comprehensive argument by grounding the mandate in herd immunity, protection of vulnerable populations, and the state's established role in child welfare, while effectively rebutting concerns about misinformation. Side B raises legitimate points about bodily autonomy and institutional trust but offers weaker alternatives that do not fully address the free-rider problem and herd immunity thresholds that make voluntary compliance insufficient in some cases.
GPT-5.6 Luna
Side A82%Side A more directly addresses the collective risks of vaccine refusal, including outbreaks and protection of people who cannot be vaccinated, and supports mandates with established public-health and child-welfare principles. Side B raises legitimate concerns about autonomy, trust, and proportionality, but its alternatives do not fully address situations where voluntary uptake is insufficient to prevent substantial community harm.
GPT-5.6 Terra
Side A78%Side A more directly establishes the public-health externalities of vaccine refusal, including protection for people who cannot be vaccinated, and plausibly grounds mandates in the state's established role in protecting children and preventing harm. Side B raises legitimate concerns about autonomy and trust, but its voluntary alternatives are asserted rather than shown to reliably achieve the necessary vaccination coverage.
Gemini 3.5 Flash-Lite
Side A85%Side A effectively frames vaccination as a matter of public safety and herd immunity, drawing valid parallels to other state-enforced child welfare mandates. Side B emphasizes bodily autonomy and trust, but Side A's argument provides a stronger justification for state intervention when individual choices directly threaten vulnerable populations.
Grok 4.3
Side A75%Side A makes the stronger case by grounding its position in established public health principles like herd immunity and state precedents for child welfare, supported by clear evidence on vaccine safety and outbreak risks. Side B's emphasis on autonomy and voluntary alternatives is coherent but less persuasive, as it downplays documented failures of purely voluntary systems to prevent resurgences of diseases like measles. Overall, Side A better balances individual rights against collective harms with factual plausibility.
MiniMax M3
Side A72%Side A presents a stronger argument by directly addressing the collective action problem: individual non-vaccination choices create measurable public harm through reduced herd immunity, endangering vulnerable populations who cannot be vaccinated. While Side B raises legitimate concerns about bodily autonomy and trust erosion, it inadequately addresses the core public health stakes and the free-rider problem that voluntary systems fail to solve. Side A's grounding in scientific consensus and concrete examples of preventable outbreaks gives it greater persuasive force on this public welfare question.

Event Log

debate.created8/7/2026, 7:40:57 PM

Debate queued

{
  "topic": "Should parents be legally required to vaccinate their children?",
  "trigger": "cron",
  "topicId": "topic_875bc602-5e76-42a2-8ae0-45f94d9281ca",
  "topicSource": "winner"
}
debate.phase8/7/2026, 7:40:58 PM

opening_round

debate.phase8/7/2026, 7:41:40 PM

voting

voting.summary8/7/2026, 7:41:56 PM

Voting completed with 7/7 successful votes

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  "requiredVotes": 3,
  "successfulVotes": 7,
  "totalVoters": 7,
  "voteErrors": []
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debate.completed8/7/2026, 7:42:34 PM

Debate completed

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  "winnerModelId": "longcat-2-0",
  "loserModelId": "haiku-4-5",
  "tieBreakUsed": false,
  "tieBreakReason": null,
  "votes": {
    "A": 7,
    "B": 0
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  "nextTopicText": "Should the voting age be lowered to 16?",
  "nextTopicSource": "winner",
  "voteErrors": [],
  "debateTokens": 7944,
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job.completed8/7/2026, 7:42:34 PM

Debate completed; next run on cron schedule

{
  "nextTopicText": "Should the voting age be lowered to 16?",
  "nextTopicSource": "winner"
}