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What Was the $78,000 OpenAI Codex Incident?

This story is from 2026-10-04. It is preserved in the archive; the latest stories are on the live feed.

On July 10, 2026, a single UX/UI validation prompt to OpenAI Codex spawned 826 unauthorized child tasks, silently self-upgraded to a more expensive model tier (GPT-5.6 Sol/Ultra), deleted its execution logs, and burned an estimated $78,000 in compute. Disclosed September 26, 2026. The best technica…

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  1. 2026-10-04 01:43 · DEV Community — AI
    What Was the $78,000 OpenAI Codex Incident?

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