GPT-5.1 broke my custom GPT actions

GPT builders
1

Today is rolling GPT-5.1 and my custom GPT, that uses an external MCP to do some actions is refusing to do the thing. I’ve tried updating it, but even in the actions panel of the custom GPT when I click the “Test” button beside an action I get a error response. The GPT says it doesn’t have any actions set.

8 Likes
Custom GPT OAuth stuck on “Talking to <domain>” ,looking for official guidance
Custom GPT keeps sending empty requests that fail
2

Update on this:
The same Custom GPT works fine from a ChatGPT Plus suscription. Using a free or ChatGPT Go suscription it doesn’t call the actions. So, its related with the new router from GPT-5.1 in the low-tier suscriptions.

4 Likes
3

Made me fumble around all morning

2 Likes
4

Same issue happened to us as a free user.

@OpenAI_Support PLEASE pay attention to this :folded_hands:

1 Like
5

My GPTs got the same issue, affect many users. @OpenAI_Support please take a look at this.

3 Likes
6

I have ran into this issue and have been banging my head trying to troubleshoot it.

Since 5.1 came, I can’t get my GPT to use my MCP tool - it keeps telling me there is no tool / action available to it besides search, even when it is visible in the UI. Same thing happens when using the “Test” in the Custom GPT config UI - it shows the “Call the {URL} API with the {oprationID} operation” info box, but then tells me that it can’t use a non-existant tool or call web APIs directly.

I tried re-adding the action and creating a new GPT from scratch but neither yielded different result.

I also tried public GPTs and some of them with custom actions have a similar issue - they tell me they have tools avaialbe, but when trying to call them tell me that tool is disabled / unavilable.

(I am using the Go subscription for reference, so I can’t change the model to legacy ones)

3 Likes
Custom MCP tools doesnt work with gpt-5.1 model
7

Hi everyone,

this is a wide problem, custom GPTs from big companies that rely in function calls don’t work anymore with the free/Go plans :backhand_index_pointing_down::backhand_index_pointing_down::backhand_index_pointing_down:

2 Likes
8

This issue seems to occur with GPT 5.1, but in GPTs for free users there is no mechanism to choose a different model, so they are forced to use 5.1.

2 Likes
9

All my custom GPTs can’t be accessed from free account, I am getting lots of user complaints.

The same issue was encountered after rollout of gpt 5 in Aug where customers actions stopped working.

@OpenAI_Support - Guys please help us fix this or advise if your policy has changed and custom GPTs with actions would not be available from free account?

10

Hi everyone, thanks for surfacing! We're taking a look now.

4 Likes
11

Hi everyone, we just deployed a potential fix. Is anyone still able to repro the issue?

1 Like
12

Hello OpenAI Support,

I’m still experiencing an issue with a custom GPT that is supposed to use an external action. The action works perfectly in ChatGPT Plus/Pro as before, but when I use the same GPT in other environments (such as Go & free ChatGPT account), the action does not appear and cannot be executed.

Details:

  • The GPT expects to call an action named getRollcall using an Access Token (e.g., 4b52a25219cc).

  • In ChatGPT Plus, the action is recognized and runs normally.

  • In the environment of free users (95% of the users), the action does not load at all - there is no available endpoint, and the GPT reports that the action system is not connected.

  • This prevents the GPT from functioning as designed because the core workflow depends on calling that action.

Could you please check why the action is not available outside of the Plus/Pro environment and how to ensure the custom GPT consistently loads its actions across all supported contexts?

Thank you!

1 Like
13

{“error”: “No applicable tool for getRollcall. This is a placeholder; actual action call not supported in this environment.”}

14

Hi Team, it’s still not working . It’s asking user to allow the GPT to connect with custom action/ api, but not giving the option it was giving earlier to connect ‘allow access’ .

1 Like
15

Hi,

still not working.

:frowning:

1 Like
16

Still not working at all.

2 Likes
17

Confirmed Still is not working

1 Like
18

I tested it, but the issue is still not resolved. I want it to be fixed as soon as possible.

2 Likes
19

@OpenAI_Support - Any update please? It’s been 48 hours since the issue was first encountered.

2 Likes
20

As a fan of OpenAI & ChatGPT, I think this is the most serious problem of ChatGPT since 11/2022.

2 Likes