Amazon Web Services (AWS) has clarified that a service interruption in December 2025 happened due to human error, rather than any fault in its AI tools.
A recent report from the Financial Times said December’s cloud outage stemmed from errors involving AWS’ own AI tools, citing sources familiar with the incident. Specifically, AWS’ agentic Kiro AI coding tool decided to autonomously “delete and re-create the environment,” which spurred the AWS outage in late 2025, according to the report.
The company pushed back against these reports denying its internal AI coding agent, Kiro, autonomously caused the outage.
Amazon described the event as an “extremely limited” incident that did not impact broader services such as compute, storage, databases, AI technologies, or other core infrastructure. The disruption lasted approximately 13 hours, and affected a single customer-facing feature – AWS Cost Explorer.
“The service interruption was an extremely limited event last year when a single service (AWS Cost Explorer—which helps customers visualize, understand, and manage AWS costs and usage over time) in one of our two Regions in Mainland China was affected,” Amazon said.
Amazon said its Kiro AI tool “requests authorization before taking action” by default, so AI did not bypass human engineers.
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