Where does the bug appear (feature/product)?
Cloud Agent (GitHub, Slack, Web, Linear)
Describe the Bug
When saving/updating an Automation configured to use the Claude Opus 5 (High thinking) model, the update request fails with a 400 Bad Request. The backend model registry does not recognize the model id claude-opus-5, even though “Claude Opus 5 High” is selectable in the Automations model picker in the UI.
Steps to Reproduce
- Open Automations and create/edit an automation with a webhook trigger.
- Set the model to Claude Opus 5 High
- Add agent instructions/prompt and at least one action (Open Pull Request, Send to Slack).
- Click Test.
- Observe the request to
POST /api/automations/update-automationfails with a 400 error.
Expected Behavior
The automation should save successfully with the Claude Opus 5 High model selected, and the automation should be trigger-able via its webhook afterward.
Screenshots / Screen Recordings
Operating System
MacOS
Version Information
Cursor Web
For AI issues: which model did you use?
Claude Opus 5
Additional Information
Actual Behavior
Save fails immediately with a 400 Bad Request and the following error banner in the UI:
Model ‘claude-opus-5’ does not match a known variant. Call GET /v1/models to list valid id+params combinations.
Response body:
{
"error": {
"message": "Model 'claude-opus-5' does not match a known variant. Call GET /v1/models to list valid id+params combinations.",
"details": [
{
"error": "ERROR_BAD_REQUEST",
"details": {
"title": "Bad Request",
"detail": "Model 'claude-opus-5' does not match a known variant. Call GET /v1/models to list valid id+params combinations.",
"isRetryable": false,
"additionalInfo": {},
"buttons": [],
"planChoices": []
},
"isExpected": true
}
]
}
}
Does this stop you from using Cursor
No - Cursor works, but with this issue