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The conventional response to this seems to be "Lower reasoning effort".

I have already tried this.

Like you, I am seeing a 5x slowdown compared to GPT-4O. I have lowered reasoning effort all the way, set verbosity to lowest. Still not getting good results.

https://bsky.app/profile/rickcarlino.bsky.social/post/3lvycs...

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OK - so we are not crazy.

The official response seems to be: set reasoning to the lowest and service_tier to priority, and it should work as fast as GPT-4o. But that is not the case.

They are probably still tuning it. Or maybe GPT-5 is not meant to be replacement for GPT-4o / GPT-4.1. Or this is going to be a new normal (slowest).

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