Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
sonnet 4 reasoning max mode error. for weeks!
Steps to Reproduce
{
“error”: “ERROR_OPENAI”,
“details”: {
“title”: “Unable to reach the model provider”,
“detail”: “The system failed to establish a stable connection with the model provider. This is not a client-side connectivity issue; the request is being initiated correctly, but the provider is not responding as expected.”,
“additionalInfo”: {},
“buttons”: ,
“planChoices”:
},
“isExpected”: false
}
Request ID: 9cfc32c8-b796-474c-99f9-0e2744fbf049
This issue is not related to local connectivity, client request formatting, or network instability. All client-side layers (network, TLS, API key, and request payload) are functioning normally. The request is successfully dispatched; however, the model provider consistently fails to respond.
This strongly indicates a provider-side service accessibility issue, likely related to endpoint availability, routing, or capacity allocation for Sonet 4 (Reasoning/Max mode).
I would appreciate your assistance in investigating the following:
Whether there are known service disruptions or rate-limiting conditions affecting Sonet 4 with Reasoning or Max Mode.
If the request is being systematically rejected upstream (proxy, gateway, or model distribution layer).
Whether this issue is tied to specific account-level or geographic provisioning constraints.
Looking forward to your technical insights and resolution.
Expected Behavior
{
“error”: “ERROR_OPENAI”,
“details”: {
“title”: “Unable to reach the model provider”,
“detail”: “The system failed to establish a stable connection with the model provider. This is not a client-side connectivity issue; the request is being initiated correctly, but the provider is not responding as expected.”,
“additionalInfo”: {},
“buttons”: ,
“planChoices”:
},
“isExpected”: false
}
Request ID: 9cfc32c8-b796-474c-99f9-0e2744fbf049
This issue is not related to local connectivity, client request formatting, or network instability. All client-side layers (network, TLS, API key, and request payload) are functioning normally. The request is successfully dispatched; however, the model provider consistently fails to respond.
This strongly indicates a provider-side service accessibility issue, likely related to endpoint availability, routing, or capacity allocation for Sonet 4 (Reasoning/Max mode).
I would appreciate your assistance in investigating the following:
Whether there are known service disruptions or rate-limiting conditions affecting Sonet 4 with Reasoning or Max Mode.
If the request is being systematically rejected upstream (proxy, gateway, or model distribution layer).
Whether this issue is tied to specific account-level or geographic provisioning constraints.
Looking forward to your technical insights and resolution.
Operating System
Windows 10/11
Current Cursor Version (Menu → About Cursor → Copy)
Cursor 2.1idle windows 11
For AI issues: which model did you use?
Sonnet 4
For AI issues: add Request ID with privacy disabled
9cfc32c8-b796-474c-99f9-0e2744fbf049
Does this stop you from using Cursor
Yes - Cursor is unusable