No response from Grok4 Model

[Khaled_MATHLOUTHI]

Describe the Bug

Hello
I’m using Grok4 model. It works fine but sometimes and especially today, it is no more working and there is no response for my prompts.

In the Usage stats, there is an error: “Errored, not charged”. The other models like GPT4, Sonnet4 are working well.

Thanks

Steps to Reproduce

Try to select Grok4 Model
Ask anything with Agent mode

Screenshots / Screen Recordings

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.6.23
VSCode Version: 1.99.3

For AI issues: which model did you use?

Sonnet4, Grok-code-fast1, Grok4

Does this stop you from using Cursor

No - Cursor works, but with this issue

[deanrie]

Hey, thanks for the report. It might’ve been temporary, I just tested and it works for me. Could you confirm the issue is resolved on your side?

[Khaled_MATHLOUTHI]

Thank you @deanrie . I restarted Cursor then my MacbookPro, but the issue is not yet resolved, I have tried switching to other grok models but got the same issue. Cursor is well working with Sonnet4. Please find attached the failed operations using the available Grok models and the passed one with Sonnet. Thanks for your help

[deanrie]

Is this happening in a new chat, or has your chat been around for a while? Could you also share the request ID? To do that, you’ll need to turn off Privacy Mode.

Getting a Request ID | Cursor Docs

[Khaled_MATHLOUTHI]

Hello @deanrie

IT is working today with no issue, I don’t know why the model was blocked for some days but now it is working for testing.

Thanks a lot for you help

[deanrie]

Are you using MCP servers? Some of them can interfere with the model’s work. It’s possible you disabled some of them and the model started working. In any case, next time try disabling them, in about 80% of cases the issue is with them.

[Khaled_MATHLOUTHI]

Yes, I have some MCP servers with more than 80 tokens used to connect to figma, jira gitlab…etc. I disabled some of them and kept only the needed ones before running my prompt. As you said, may be this is the root cause of the issue. But with the same tools MCP, claude / GPT5 are working, is it related to the Grok4 model itself?

[deanrie]

Yes, other models may work fine, while Grok may not. It would be great if you could identify the problematic server so we can fix it.

[Khaled_MATHLOUTHI]

I reproduced the issue @deanrie, when i have more than 99tools enabled from my MCP servers, the model is not responding. When I disable some of them to have limited tools, it works. I don’t know which MCP server causes the issue.

Please find attached the enabled MCP servers where the Grok4 model is blocked:

[deanrie]

Thanks for the info. We’ll look into it.