What happened
OpenAI's Codex coding tool failed across web, API, CLI, and its VS Code extension starting before 8 a.m. JST on September 26; OpenAI confirmed the failure at 7:58 a.m.
Why it matters
A single outage erased every way developers could reach the tool for roughly an hour, and OpenAI called the cause an 'internal problem' without explaining it.
What to watch
The full impact hinges on whether Codex repeats the failure; OpenAI revealed no root cause, so watch for any further status updates from the company.
WHO IT HITSSoftware developers and engineering teams that rely on Codex for AI-assisted coding lost access to the tool through all its interfaces for about an hour, a reminder of the operational risk in depending on a single vendor's cloud service.
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The incident unfolded quickly on the morning of September 26 Japan time. OpenAI confirmed the Codex failure at 7:58 a.m., and at 8:19 a.m. it advised users that they could access the tool by logging in with an API key. Full service returned at 8:54 a.m.
The disruption touched every way Codex can be used — the web version, API, CLI, and VS Code extension — which means developers had no workaround through another Codex interface during the hour. OpenAI attributed the outage to an 'internal problem' but gave no further detail, leaving the underlying cause undisclosed.
Whether the outage remains a one-off hinges on OpenAI's undisclosed diagnosis, so the company's follow-up status updates are the main thing to watch. For development teams that build Codex into daily coding work, the episode highlights how a single-service dependence can stall work when the service fails.
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