OpenAI confirms denial-of-service attack that disrupted ChatGPT and API availability

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]

According to OpenAI’s incident reporting and third-party coverage, a distributed denial-of-service (DDoS) attack against OpenAI caused periodic outages and elevated error rates for ChatGPT and its API, disrupting availability for both end users and developers who integrate these services into their products.[1][2][6][8] The incident did not involve model or data compromise, but it demonstrated that major AI platforms are operational targets whose uptime can be materially affected by external attackers.[1][2] From a CyberSE.AI perspective, this fits a SaaS AI risk pattern: organizations that build agents, SaaS workflows, or critical business processes on commercial LLM APIs inherit those availability and resilience risks and must treat AI providers as key third-party dependencies in business continuity planning. Practical implications include stress-testing failover strategies, defining SLAs and RTO/RPO expectations with AI vendors, and incorporating AI-service outage scenarios into broader SaaS and supply-chain risk management.