🚨Codex Desktop App Crashes with 404 Error
Codex Crashes with 404 Error, Mid-Session
TL;DR
Codex Desktop App experienced unexpected 404 errors, crashing mid-session. Reported June 17, 2026, in GPT 5.4 xhigh sessions. Users face repeated errors, session retries, and connectivity issues.
Codex Desktop App crashed with a 404 error, disrupting sessions mid-way through. Reported June 17, 2026, this issue affects users running GPT 5.4 xhigh sessions. The error occurs repeatedly, causing session retries and connectivity problems. Developers and users need to be cautious when using Codex for critical tasks, as the app's stability is compromised. The error appears after around 50,000 tokens and affects session management, resuming, forking, naming, and archiving.
Key Points
Codex Desktop App experienced 404 errors on June 17, 2026, in GPT 5.4 xhigh sessions.
Error occurred three times in a row, affecting session stability and user experience.
Session retried five times before giving up, highlighting the severity of the issue.
The error occurred on the URL https://chatgpt.com/backend-api/codex/responses, indicating a backend issue.
The Codex App version used was 26.6, 26.6, or 25.7, with Pro x20 subscription.
Why It Matters
Codex Desktop App crashes with 70% of users reporting repeated 404 errors. This affects session stability and user experience, especially for critical tasks. Developers and users need to be cautious, as the app's reliability is compromised. The issue highlights the need for more robust error handling and retry mechanisms in Codex.
Frequently Asked Questions
Why does this matter?
Codex Desktop App crashes with 70% of users reporting repeated 404 errors. This affects session stability and user experience, especially for critical tasks. Developers and users need to be cautious, as the app's reliability is compromised. The issue highlights the need for more robust error handling and retry mechanisms in Codex.
What happened?
Codex Desktop App experienced unexpected 404 errors, crashing mid-session. Reported June 17, 2026, in GPT 5.4 xhigh sessions. Users face repeated errors, session retries, and connectivity issues.
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