Some users may encounter issues with GPT-5.4-C model in Codex

Status: Monitoring

We have applied the mitigation and are monitoring the recovery.

Affected components
● Codex Web (Degraded performance)
● CLI (Degraded performance)
● App (Degraded performance)
● VS Code extension (Degraded performance)
● Codex API (Degraded performance)

via OpenAI status