Actions in Custom GPT 5.5 not working

GPT builders
1

I have 2 actions defined in my Custom GPT. These actions work fine with GPT 5.3.
I have instructions to execute the 2 actions (market data via an API) before building the response.

These actions worked fine in 5.3. 5.4 and 5.5 (all versions) do not call the defined action.

ChatGPT itself reports this:

There's an interesting discrepancy: in this chat I can see tool definitions corresponding to TradingEconomics and the EIA, but the execution environment isn't allowing me to invoke them. That points to a separation between tool definitions being presentandtool execution being available in this environment. It's consistent with a runtime limitation rather than a problem in your GPT's configuration.

Any pointers to get this sorted?

2

Not sure if related, but I had somehow the same issue.

Can’t place working links here, but check;

community.openai .com/t/custom-gpt-cant-access-external-data-since-5-6-sol/1386268

(remove the space before .com)

3

Can confirm.

Since 5.6 sol retrieved external data can’t be used via the web interface.

Set GPT to thinking, or start a plain chat and embed the custom GPT by mention it seems to work for now.

4

From a tooling perspective, why provide tools that are not supportable or break under in new environments? How many enterprise customers use CustomGPT’s? Is that a viable, supportable route?

I see quite a few threads having similar issues. Is there a list of apps/tools that are no longer supported?