Serval incident
Elevated errors across ChatGPT, Codex, and the API including the Agents API
Resolved after 5 hours 21 minutes, affecting Third Party: OpenAI (Third Party: OpenAI → APIs → Chat Completions) and Third Party: OpenAI (Third Party: OpenAI → APIs → Responses), on September 29, 2026.
The issue causing elevated errors across ChatGPT, Codex, and the API has been resolved, and all affected services have recovered. Thank you for your patience while we worked to restore service. The detailed Root Cause Analysis (RCA) will be published in the next 5 business days.
Affected components
Update timeline
- investigating Sep 29, 2026, 05:52 PM UTC
We’re investigating elevated errors affecting ChatGPT, Codex, and the API. Some users may experience failed requests, difficulty logging in or signing up, and tasks that do not complete. We’ll share updates as we learn more.
- investigating Sep 29, 2026, 06:24 PM UTC
We’re investigating elevated errors affecting ChatGPT, Codex, and the API including the Agents API. Some users may experience failed requests, difficulty logging in or signing up, and tasks that do not complete. We’ll share updates as we learn more.
- investigating Sep 29, 2026, 07:08 PM UTC
We’re still investigating elevated errors affecting ChatGPT, Codex, and the API including the Agents API. Some users may experience failed requests, difficulty logging in or signing up, and tasks that do not complete. We’ll share updates as we learn more.
- monitoring Sep 29, 2026, 07:39 PM UTC
We have applied the mitigation and are monitoring the recovery.
- monitoring Sep 29, 2026, 09:09 PM UTC
We have applied the mitigation and are monitoring the recovery.
- monitoring Sep 29, 2026, 10:03 PM UTC
We have applied the mitigation and are monitoring the recovery.
- monitoring Sep 29, 2026, 10:47 PM UTC
We have applied the mitigation and are monitoring the recovery.
- resolved Sep 29, 2026, 11:14 PM UTC
The issue causing elevated errors across ChatGPT, Codex, and the API has been resolved, and all affected services have recovered. Thank you for your patience while we worked to restore service. The detailed Root Cause Analysis (RCA) will be published in the next 5 business days.
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