Executive Summary
OpenAI confirmed a denial-of-service attack caused periodic ChatGPT and API outages; no model compromise occurred.
What Happened
OpenAI reported that it experienced a denial-of-service attack that caused periodic outages and elevated error rates for ChatGPT and its API.[1] While the incident did not involve model compromise, it demonstrated growing targeting of major AI platforms in the threat landscape and highlighted availability risk for businesses that build SaaS and agent capabilities on top of commercial LLM APIs.[1]
Affected Products
- OpenAI ChatGPT
- OpenAI API
Vulnerability / Attack Technique
DoS against an AI platform
Technical Mechanism
Service flooding.
AI Security Category
LLM10:2025 Unbounded Consumption
Relevant Frameworks
RealGround Analysis
Apps built on one LLM API inherit its availability risk. RealGround analysis: plan fallbacks.
Recommended Controls
- Design fallbacks for LLM API outages
Related RealGround Service
AI Security Readiness Assessment · or start with the free AI Agent Security Scanner.
Sources
OpenAI Status / Incident Report: https://status.openai.com/incidents/9r2f7p1xqj3l
Summary and analysis written by RealGround from the source above; last updated 2026-10-18.