Codex Is Down

The user runs Codex 26.611.61753 on macOS Darwin 25.3.0 arm64 with a Pro x20 subscription. A GPT 5.4 xhigh session repeatedly returned “404 Not Found” after ~50 k tokens, especially after steering a sub-agent, and aborted after five retries. A parallel GPT 5.5 xhigh session was unaffected. The user asks that sessions no longer terminate mid-run and that error handling use exponential back-off with up to 20 retries over ten minutes.