Simply garbage, the model's intelligence has severely degraded.

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

26.527.60818

What subscription do you have?

pro

What platform is your computer?

win11

What issue are you seeing?

The model has suffered a severe decline in intelligence. Currently, the GPT-5.5 xhigh model has experienced a very serious drop in intelligence, and its actual capability is extremely poor, to the point of being unbearable. Its real performance is definitely inferior to DeepSeek V4, and its performance is very bad.

What steps can reproduce the bug?

The model has suffered a severe decline in intelligence. Currently, the GPT-5.5 xhigh model has experienced a very serious drop in intelligence, and its actual capability is extremely poor, to the point of being unbearable. Its real performance is definitely inferior to DeepSeek V4, and its performance is very bad.

What is the expected behavior?

_No response_

Additional information

_No response_