Not able to use Claude-4.5-sonnet

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Request ID: 92791064-a183-4c78-b3f8-03df07b0a14b
{“error”:“ERROR_OPENAI”,“details”:{“title”:“Unable to reach the model provider”,“detail”:“We’re having trouble connecting to the model provider. This might be temporary - please try again in a moment.”,“additionalInfo”:{},“buttons”:,“planChoices”:},“isExpected”:false}
ConnectError: [unavailable] Error
at QJc.$endAiConnectTransportReportError (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4989:399336)
at Ywo._doInvokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:36007)
at Ywo._invokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:35749)
at Ywo._receiveRequest (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:34514)
at Ywo._receiveOneMessage (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:33336)
at GDt.value (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:31429)
at _e._deliver (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)
at _e.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)
at ggt.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4974:12156)
at MessagePort. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7498:18439)

Steps to Reproduce

I am just giving some prompt and using claude-4.5-sonnet

when i hit this it was working fine and suddenly it started throwing this error since yeasterday

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.77 (Universal)
VSCode Version: 1.99.3
Commit: ba90f2f88e4911312761abab9492c42442117cf0
Date: 2025-11-13T23:10:43.113Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 25.1.0

For AI issues: which model did you use?

claude-4.5-son

For AI issues: add Request ID with privacy disabled

Request ID: 92791064-a183-4c78-b3f8-03df07b0a14b

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

Hey, thanks for the report. The error you’re seeing is usually related to a network connectivity issue. Please try the following:

  1. Run network diagnostics:
  • Open Cursor Settings → Network → click “Run Diagnostics”
  • Share the results here
  1. Create a new chat and check if the issue happens there as well

This helped fix the same error for another user.

It would also be helpful to know:

  • Are you using a VPN or a corporate network?
  • Do other models (for example, GPT-5) work for you?

Let me know what you find!

3

Hi,

It has nothing to do with the network.

If I change other models then it is working fine, when I switch it to Claude-4.5 sonnet then only it is throwing this error.

Today Again I checked again the same issue is coming

4

I am having the same issue. I can get Gemini 3 working, but its stuttering. Clause 4.5 wont work at all - cant connect to the model. The last few days have been terrible in Cursor

5

Yes, I guess it is happening since the composer came in to the field.

6

I’m having the same issue since an update.

7

Today I am getting the error for claude-4.5-opus-high

There is not network issue and works if I select different models but with this model, this issue is very frequesnt

Request ID: 9d0b99de-40c9-4075-b732-6684031e82e2
ConnectError: [unknown] Network disconnected
at kZc.$streamAiConnect (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:6330:405811)
at async vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:565:75277
at async wps.toolWrappedStream (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2973:27159)
at async vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4063:10092
at async JL.handleStreamComposer (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2786:993)
at async oro.streamResponse (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7151:12141)
at async Fso. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7082:8433)
at async Oso. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7084:2281)
at async Eso. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7078:1113)
at async Tso. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7078:34444)
at async Rso. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7078:48849)
at async rFe. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2973:45096)
at async Nso. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7082:7461)
at async hse.processCodeBlocks (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:2899:3418)
at async Rj.submitChatMaybeAbortCurrent (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4063:13781)

8

Hey @Swaroopa_Babaleshwar, thanks for the detailed reports with request IDs.

This issue has been affecting several users over the past week. A similar report was resolved on Nov 25 after a server fix.

Could you please confirm:

  • Are you still experiencing this issue?
  • If yes, could you share network diagnostics results: Cursor Settings → Network → Run Diagnostics

Also worth trying:

  • Disable HTTP/2: CMD+, → search “HTTP/2” → enable “Disable HTTP/2” → restart Cursor
  • Create a new chat to see if the issue persists

Let me know if the problem continues after these steps!

9

I am using claude-4.5-opus-high

with this 2 days back I was facing some issues, but now it is working totally fine.

But this new model is not working with MAX mode