California median existing single-family home prices decline year-over-year in 2027.
California home prices remain elevated amid supply constraints. Resolution requires the California Association of Realtors to report a lower annual median price for 2027 than 2026.
Across 6 frontier models answering independently, the panel thinks this is unlikely: the median is 22%.
They broadly agree, 22 points between GPT at 41% and Qwen at 19%.
Nothing is settled until 10 Nov 2029, when the outcome is checked against sources and every number above gets a permanent score.
What each one said
-
GPTOpenAI
The call hinges on whether California’s chronic inventory shortage outweighs affordability strain and any 2027 recession.
- CAR’s annual median must fall below 2026, with its statewide 2027 report likely published in early 2028.
- Annual California price declines occur in downturns, but constrained listings helped prices recover quickly after the 2022–23 correction.
- A material rise in unemployment or mortgage rates staying near 7% through 2027 would move this sharply higher.
41% -
ClaudeAnthropic
Turns on whether mortgage rates stay elevated enough or inventory rises enough to break CA's persistent supply-driven price floor.
- CA median prices have declined YoY in only a few years this past decade (2008-2011, 2022), showing resilience from chronic undersupply.
- Rates staying above 6-6.5% through 2027 plus rising inventory and weak affordability could tip annual median negative, but base case is flat-to-up low single digits.
- A recession or sharp rate spike in 2027 would most change this, as would continued record-low housing starts keeping supply tight.
28% -
GeminiGoogle
California nominal home price drops require severe recessionary job losses to outweigh chronic structural housing shortages.
- CAR data shows nominal median annual price drops occur in only about 15% to 20% of years historically.
- Tight lock-in effects and persistent inventory deficits prevent forced selling unless major tech or coastal unemployment spikes.
- A sharp spike in mortgage rates above 8% paired with national recession would push probability toward 50%.
22% -
GrokxAI
A 2027 recession or rate spike would be needed to reverse CA's supply-constrained price path.
- CAR's 2027 annual median must print below 2026's; that requires a demand shock after rates have already eased by late 2026.
- Annual declines occurred in ~20% of years since 1980, almost all clustered in recessions; current pricing shows none, so this sits below base.
- A 2027 US recession would most change the call.
22% -
DeepSeekDeepSeek
It turns on whether mortgage rates stay near 6% or climb back above 7% through 2027.
- CAR's annual median has fallen year-over-year only in 2007-08 and briefly 2019, roughly 3 of the last 40 years.
- Supply stays structurally tight: California has underbuilt by ~100k units a year for a decade, which cushions prices against demand shocks.
- The Fed's path matters most; if 30-year rates hit 7.5% by mid-2027, affordability-driven volume collapse could drag the median down.
22% -
QwenAlibaba
Requires a recession or rate shock; supply constraints alone have historically prevented YoY declines in non-recession years.
- California median prices fell YoY only during the 2008-2011 crisis and briefly in 2022-2023; both required macro shocks, not just affordability strain.
- Supply constraints (CEQA, local zoning, low permitting) create a price floor—sellers withdraw rather than cut, keeping transaction medians elevated even in soft demand.
- A 2027 recession or renewed rate spike above 7.5% would be the primary trigger; absent a clear leading indicator today, base rate sits near the historical ~15-20%…
19%
6 of 6 models answered · 22 points between the highest and lowest. None was shown the market price.
Question sourced from a news sweep on 11 Nov 2026. Forecast by google/gemini-3.8-flash, anthropic/claude-sonnet-5, openai/gpt-5.6-terra, x-ai/grok-4.6, deepseek/deepseek-v4.1-flash, qwen/qwen3.8-max-0902 via OpenRouter.