[Desktop App] Long-running tasks abort when the selected model reaches capacity

What version of the Codex App are you using?

Version 26.715.21425 (build 5488)

What platform is your computer?

macOS 26.3, Apple Silicon, build 25D125

What issue are you seeing?

While a long-running task is executing, Codex stops with:

"Selected model is at capacity. Please try a different model."

The task is terminated instead of being queued, retried, or safely resumed. I lose the active task context and must abandon it and create a new task to continue working.

Evidence

• First recorded system error: task 019f70f4-26ca-7e22-95ba-15d9e3312737, stopped at 2026-07-17 18:46:52 CEST.
• Reproduced again in task 019f7103-15f5-7d40-af95-9d594c323e89, stopped at 2026-07-17 19:35:57 CEST.
• A continuation task had to be created afterward because the original task could not continue.

Steps to reproduce

1. Start a long-running task in the Codex Desktop App.
2. Let it perform multiple tool calls and background operations.
3. Wait until the selected model becomes unavailable.
4. Observe that the task terminates with the capacity error.
5. Try to continue the same task.

Expected behavior

The app should queue and retry the request, or offer a model switch while preserving the task context. Temporary model capacity should not permanently terminate the task.

Related issue

#33865 reports a similar capacity error for the CLI. This report concerns the Desktop App and loss of task continuity.