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Why fewer children are born

Twelve of the strongest AI systems in the world were given the same brief, independently, and asked why births are falling almost everywhere — and who, if anyone, is responsible. This is the series: one part per answer, then the argument, then the verdict.

15 parts

WHAT THIS SERIES IS

Global fertility has fallen from roughly five children per woman in 1960 to roughly 2.2 today. Most of humanity now lives in a country below the replacement rate.

We asked twelve frontier AI systems, from twelve different laboratories, the same three questions: why is this happening, who is responsible, and when did it happen. They answered without seeing each other. Then we showed each of them what the others had said and made them argue, across five rounds.

This series publishes all of it. One part per answer, in the order the panel sits. Then the debate. Then the closing verdict, written by the model the others voted strongest.

  1. Intro We asked twelve AIs why fewer children are born Twelve of the strongest AI systems in the world were given the same brief, independently, and asked why births are falling almost everywhere — and who, if anyone, is responsible. This is the…
  2. Part 1 OpenAI: smaller families became desirable and achievable OpenAI puts the largest single share on changed economics of raising children (24 %). Part 1: what the model answered on its own, before it saw what the others wrote.
  3. Part 2 Google DeepMind: global fertility fell because women gained… Google DeepMind puts the largest single share on female Education and Empowerment (35 %). Part 2: what the model answered on its own, before it saw what the others wrote.
  4. Part 3 xAI: development made children costly xAI puts the largest single share on women's education and time cost (24 %). Part 3: what the model answered on its own, before it saw what the others wrote.
  5. Part 4 Anthropic: parents, not plotters, cut births Anthropic puts the largest single share on women's education and paid work (20 %). Part 4: what the model answered on its own, before it saw what the others wrote.
  6. Part 5 Meta: global fertility decline driven by urbanization, education… Meta puts the largest single share on urbanization (30 %). Part 5: what the model answered on its own, before it saw what the others wrote.
  7. Part 6 DeepSeek: fertility fell because child survival, female… DeepSeek puts the largest single share on child mortality decline (25 %). Part 6: what the model answered on its own, before it saw what the others wrote.
  8. Part 7 Mistral AI: falling fertility stems from women's freedom, urban… Mistral AI puts the largest single share on women's education (25 %). Part 7: what the model answered on its own, before it saw what the others wrote.
  9. Part 8 Alibaba Qwen: female education and urbanization drive fertility… Alibaba Qwen puts the largest single share on female Secondary Education (30 %). Part 8: what the model answered on its own, before it saw what the others wrote.
  10. Part 9 Moonshot AI: fertility fell because modernity made children… Moonshot AI puts the largest single share on economic development and urbanization (30 %). Part 9: what the model answered on its own, before it saw what the others wrote.
  11. Part 10 Z.ai (Zhipu): fertility collapsed because women got options… Z.ai (Zhipu) puts the largest single share on economic shift to costly children (28 %). Part 10: what the model answered on its own, before it saw what the others wrote.
  12. Part 11 Amazon: global fertility declines driven by urbanization and… Amazon puts the largest single share on urbanization pressures (25 %). Part 11: what the model answered on its own, before it saw what the others wrote.
  13. Part 12 Perplexity: fewer children reflect development, women’s choices… Perplexity puts the largest single share on female education and autonomy (20 %). Part 12: what the model answered on its own, before it saw what the others wrote.
  14. Part 13 We put the twelve answers on one table and let them fight Five rounds, twelve models, 56 concessions and one number every model had to commit to: how much of the fall would have happened anyway.
  15. Finale The verdict: who is to blame for fewer children Fertility fell because development rewrote the cost of children; only a few states coerced births.

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