Astra reasoning quality appears significantly degraded compared with previous sessions

What version of the Codex App are you using (From “About Codex” dialog)?

26.908.40834

What subscription do you have?

ChatGPT ProX20

What platform is your computer?

Windows 10

What issue are you seeing?

Astra's reasoning quality appears to have degraded significantly. In recent sessions, it performs noticeably worse on the same types of tasks that it previously handled correctly.

The model is more likely to misunderstand explicit instructions, produce shallow or incorrect reasoning, lose important context, and require repeated corrections. The difference is large enough that it feels like the model's effective reasoning capability has been reduced.

This is not just a single bad response. I have observed the behavior repeatedly in actual Codex tasks. I submitted the affected conversation through /feedback so the team can inspect the original thread and full context.

Feedback ID: 01a096e9-26b6-7371-8d76-35dfc8739455

Please check whether there have been changes to Astra's routing, reasoning configuration, context handling, or model behavior that could explain this regression.

What steps can reproduce the bug?

Feedback ID: 01a096e9-26b6-7371-8d76-35dfc8739455

What is the expected behavior?

Fix

Additional information

No response

Start by reviewing the submitted conversation associated with feedback ID 01a096e9-26b6-7371-8d76-35dfc8739455, using the reported Codex App version 26.908.40834 and Windows 10 environment. Compare the affected behavior with prior sessions and investigate whether routing, reasoning configuration, context handling, or model behavior changed. Done means identifying and addressing the reported reasoning-quality regression.