The US Case-Shiller National Home Price Index drops at least 10% from its peak before end-2028.

Question

Six frontier AI models put this at 20% by 8 Oct 2029. Full reasoning from every model.

WillHappen.ai · Accepted Answer

20% — the median of 6 frontier models, resolving by 2029-10-08.

Answer

Gemini (Google): 18% — A 10% nominal national decline requires massive forced selling and severe recession, which fixed-rate lock-in effects resist. Over 75% of US mortgages are locked below 5%, choking inventory and preventing nominal price drops outside the 2008 crash. A 10% national plunge needs sharp unemployment spikes over 6.5% to trigger widespread distressed sales within two years. A sudden surge in builder liquidations or major financial sector contagion triggering systemic credit freezes would change this.

Answer

Claude (Anthropic): 12% — Hinges on whether high mortgage rates plus inventory build finally force a nationwide 10%+ nominal decline, not just regional softness. Case-Shiller national index has been resilient despite high rates, with mild declines in some metros but national index near flat-to-up since 2023. A 10% nominal national drop historically only happened in 2007-2012 GFC; absent a recession/credit event, broad declines of that magnitude are rare. Lock-in effect from low legacy mortgage rates keeps supply tight, limiting downside even if demand weakens; a labor-market shock would be the key risk to watch.

Answer

GPT (OpenAI): 24% — A 10% national nominal decline likely requires a recession with forced selling, not merely elevated mortgage rates. Case-Shiller’s 2006 peak-to-2012 trough fell about 27%; the 2022-23 adjustment was only roughly 5%. The Fed, labor market and housing supply must deteriorate enough before December 2028 to overwhelm locked-in low-rate owners. I would raise this sharply if unemployment exceeds 6% alongside rising delinquencies and a sustained jump in listings.

Answer

Grok (xAI): 18% — A recession or credit shock large enough to overwhelm tight inventory by late 2028. Only the GFC produced a 10%+ national Case-Shiller drop in 40 years; 2022 high-rate episode peaked at ~5%. Labor-market and mortgage-credit conditions would need to worsen sharply in 2027 for transaction volume to collapse. A 2008-style freeze in private-label or bank lending would be the clearest upward revision.

Answer

DeepSeek (DeepSeek): 22% — A 10% national drop needs a recession or a mortgage-rate shock that forces broad forced selling, not just unaffordability. The Fed controls the trigger: without cuts, mortgage rates near 7% keep supply frozen and prices sticky; with cuts, demand revives and prices rise. Case-Shiller national has never fallen 10% without a recession or credit crisis; 2008 was the only such event in 35 years of data. Current conditions (low inventory, positive real income growth, no subprime leverage) sit well below the 2008 setup, so base rate is closer to 10-15%.

Answer

Qwen (Alibaba): 22% — A 10% national drop requires either a recession with forced selling or a credit event; neither is currently priced in. The 2008 crash (-33%) and early-1990s dip (-6%) are the only modern precedents for double-digit national declines; both required severe macro stress. Current mortgage lock-in effect keeps inventory thin, which supports prices even with elevated rates; a 10% drop needs supply to overwhelm demand. A sharp recession or unemployment spike above 6% would be the trigger that changes this materially; absent that, nominal prices rarely fall 10% nationally.

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