Unable to Connect to Anthropic's Claude Models

[sunildhewa]

Describe the Bug

Since 1st August, 2025 every request to Claude Sonnet fails with the banner
“We’re having trouble connecting to the model provider. This might be temporary – please try again in a moment.”
Even though no response is ever returned, each attempt is counted as a consumed Fast Request and is visible in the Usage Events list with status Errored, Not Charged—yet the Included Requests counter still decreases. This makes the Pro plan unusable when the connection hiccup persists.

Steps to Reproduce

• Open Cursor 1.3.8.
• Open a new Chat or Agent session and choose any Claude Sonnet model.
• Send any prompt.
• Observe the error banner stating “We’re having trouble connecting to the model provider. This might be temporary - please try again in a moment.
  (Request ID: 630f4e5f-67a8-46a9-b329-e950568171a7)”

Expected Behavior

The Claude models should load successfully, providing code completion or chat responses without connection errors. The IDE should either connect to Anthropic’s API seamlessly or provide a clear indication of any account or configuration issues.

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.3.8 (user setup)
VSCode Version: 1.99.3
Commit: a1fa6fc7d2c2f520293aad84aaa38d091dee6fe0
Date: 2025-07-31T21:46:17.109Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100

Does this stop you from using Cursor

Yes - Cursor is unusable

[deanrie]

Hey, thanks for the report. Are you using a VPN, proxy, or any software that controls your internet? Try running a network diagnostic in the network settings under the “Network” tab. Also, try disabling HTTP2, sometimes this can help.

[sunildhewa]

Hi, I’m not using any VPN or anything. Network dignostic report is okay. The problem is particulary with Claude models, All other models are working perfectly.

[condor]

hi @sunildhewa thank you for the screenshot. Note that we route all requests through our systems, all models use the same connection from your IDE.

This leaves following common causes:

• Do you have any API key setup?
• Are any MCPs configured?

For the Request ID you posted, was it with privacy disabled?

(If not, could you post a Request ID with privacy disabled so we can look into the details? Cursor – Getting a Request ID)

[deanrie]

Are you switching models within the same session? In any case, try disabling HTTP2 and check if the problem persists.

[yakovw]

Let a new conversation start, it always worked for me.