gpt-5.4 has recovered and is operating normally.

We are seeing failed requests for gpt-5.4 and are investigating. (HTTP 503: {"error":{"code":"modelnotfound","message":"分组 auto 下模型 gpt-5.4 无可用渠道（distributor） (request id: 20260720100050105709348268d9d62gmFKFWw)","type":"newapierror"}})