AI incident
Zillow Offers iBuying model drift
Zillow · 2021
Organisation
Zillow
Year
2021
Failure mode
Concept drift
Severity
critical
Domain
Credit & financial scoring
Agentic
Yes — an AI system acting, not just advising
Source
Zillow Q3 2021 disclosures
What happened
An automated home-buying model mispriced at scale as the market shifted, forcing a ~$500M write-down and shutdown.
What would have prevented it
Post-market drift monitoring + human gatekeeping on price thresholds
Requirements this maps to
Editorial cross-reference from our prevention note — it is not a finding that any law was breached.