ChatGPT 的 Codex 功能出现服务故障12。用户在长时间运行的 AI Agent 会话中遭遇 404 错误，错误信息显示为"unexpected status 404 Not Found: Unknown error, url: https://chatgpt.com/backend-api/codex/responses"[1](#source-1)。该问题发生在用户进行 sub-agent 编排操作后不久，此时会话已运行至约 50000 tokens 处1。
受影响的用户订阅为 Pro x20 等级，使用的模型版本为 GPT 5.4 xhigh 和 GPT 5.5 xhigh1。用户尝试了 5 次重试但均告失败1。针对此次故障，用户建议改进错误重试机制，采用指数退避策略，在 10 分钟内进行约 20 次重试，以提高长时间运行任务的稳定性1。
Users of ChatGPT's Codex feature are encountering service disruptions due to 404 errors that interrupt their AI Agent workflows 12. The error message displayed to users indicates "unexpected status 404 Not Found: Unknown error" when attempting to access the Codex backend API 1. One affected user running a Pro x20 subscription with GPT 5.4 xhigh and GPT 5.5 xhigh models reported the failure occurred during a long-running session after sub-agent orchestration operations, at approximately 50,000 tokens processed 1. The user attempted to recover from the error through five consecutive retries, all of which failed 1.
In response to the outage, the affected user has recommended that the platform implement more robust error handling mechanisms, including an exponential backoff retry strategy that would allow for approximately 20 retry attempts within a ten-minute window 1.
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