OpenAI Applies Mitigation as Elevated Error Rates Hit API Models

On September 17, 2026, OpenAI reported elevated error rates across API models, affecting 12 platform components including Chat Completions, Responses, Sora and Login. An hour after the first notice, the company said it had applied a fix and was monitoring recovery.

• Outage affected 12 API components, including Chat Completions, Images and Sora
• First update posted at 16:20 ET, second at 17:20 ET
• ChatGPT, Codex and FedRAMP were not among affected services
• API availability from June to September 2026 was 99.93%