The US Case-Shiller National Home Price Index posts positive year-over-year growth through 2027.

Question

Six frontier AI models put this at 67% by 10 Nov 2029. Full reasoning from every model.

WillHappen.ai · Accepted Answer

67% — the median of 6 frontier models, resolving by 2029-11-10.

Answer

Gemini (Google): 42% — Unbroken positive YoY home price growth through 2027 requires dodging any national pricing dip across 14 consecutive monthly reports. S&P CoreLogic data must record positive 12-month change in every release through the December 2027 report published in early 2028. Historically, sustained high mortgage rates and creeping inventory yield occasional flat or negative national YoY prints. A sharper Fed easing cycle lowering 30-year fixed rates below 5.5% by mid-2027 would push this probability above 65%.

Answer

Claude (Anthropic): 74% — Hinges on whether mortgage rates ease enough to prevent a broad multi-year price decline through 2027. Case-Shiller YoY has been positive almost continuously since 2012, with only brief 2022-23 deceleration without going negative nationally. Current national prices are roughly flat to slightly up YoY with low inventory providing a floor, so a sustained negative streak through all of 2027 requires a real… Recession or renewed rate spikes above 8% could flip YoY negative for stretches, which is the main risk to this holding true throughout the period.

Answer

GPT (OpenAI): 63% — Sustained gains hinge on mortgage rates easing without a recession-driven rise in forced selling. National Case-Shiller has usually risen over multi-year spans, but downturns followed the 2006 boom and severe economic shocks. Monthly prints through December 2027 must stay above their year-earlier levels; tight resale inventory is the main support. A sharp recession or mortgage rates staying near 7% long enough to suppress demand would materially lower the odds.

Answer

Grok (xAI): 71% — Whether a 2027 recession or rate spike reverses national prices enough for any YoY print to go negative. Fed must keep policy from triggering a housing demand collapse before mid-2027; Case-Shiller Dec-27 data arrives Feb-28. National YoY negatives occurred in only ~15% of months since 1987, clustered in 2007-12 and a brief 2023 dip. A confirmed 2027 recession with rising unemployment would most shift the odds downward.

Answer

DeepSeek (DeepSeek): 72% — Whether the Fed avoids a recession deep enough to push national home prices into a sustained 12-month decline by 2027. The index's 12-month change was still positive in mid-2026, and the last negative YoY print was May 2023, so the base rate for a 12-month stretch of gains is high. Mortgage rates near 6-7% and elevated inventory are the main drags, but the Fed's easing path into 2027 supports prices; a sharp recession or rate spike above 8% would… The resolution window covers reports through 2027, so only a sustained decline starting in 2027 would break the streak; that requires a housing-specific shock, not just…

Answer

Qwen (Alibaba): 57% — Low inventory provides a floor, but any recession or demand shock in 2027 breaks the streak for at least one month. The national index went negative YoY for ~6 months in 2022-23 without a recession, showing how thin the margin is. Structural undersupply (~3-4M unit deficit) and the lock-in effect keep a price floor, but a 2027 recession with rising unemployment would overwhelm it. Base rate for 12 consecutive months of positive YoY growth is high (~80% in non-recession years), but recession probability over the next 14 months is roughly 25-30%…

The US Case-Shiller National Home Price Index posts positive year-over-year growth through 2027.

US national median home prices fall year-over-year by the end of 2027.

The US median existing home sales price drops by at least 15% from its peak before 2028.

California median existing single-family home prices decline year-over-year in 2027.

US home prices continue to rise quarter-over-quarter through the first half of 2027.