Custom GPT Actions Stopped Working

Hey @Philippe_Plourde, yeah, that’s definitely frustrating, especially if it was working before. If 4o is triggering the action but 5.x says it used it without actually calling it, this could be something like a cached session or how that variant is handling external actions.

A few quick things I’d try:

• Test in an incognito or private window to rule out caching or extension issues
• Create a brand new GPT, set up the same Action, and see if it behaves the same
• Try adding a different simple Action and check whether that one fires correctly
• Temporarily disable other tools like Web or Code Interpreter and test again

If you can share a bit more detail around when this started and whether it’s consistent across runs, we can dig into it further. You may also want to compare your setup against the GPT Actions getting started guide to make sure everything aligns with the current implementation.