Claude 4.5 sonnet doesn't work now for 2 days

[Unija_Sibit]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Normal one and thinking - Claude 4.5 sonnet - whenever I try to use it - it says it has an error - Provider is not accessible - BUT claude 4 sonnet - works ok …

I tried again right now - it seems that works now - but it failed the first tiem . the OK button started .. but failed .. didn’t return any error .. on second turn it worked ok ..

Steps to Reproduce

Choose Claude 4.5 thinking or and normal one and try to prompt

Expected Behavior

It should work normally as Claude sonnet 4.0

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.7.46 (system setup)
VSCode Version: 1.99.3
Commit: b9e5948c1ad20443a5cecba6b84a3c9b99d62580
Date: 2025-10-14T01:21:46.830Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100

For AI issues: which model did you use?

sonnet 4.5 thinking or normal one

Additional Information

the prompt works sometimes - when i press Ok - just starts then fails.. nothing happens .. then other times . it makes error .. other time it works ..

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

[yaireo]

I use it tons every day and it works for me.. are you using your own API key?

If a model chat fails then you need to attach the ID of that interaction so the devs could investigate the reason.

[deanrie]

Hey, thanks for the report. To help diagnose the issue, please clarify:

• The exact error message when trying to use Claude models
• Whether you’re using Cursor’s built-in Claude API or your own API key
• Whether other models (e.g., GPT-5) work
• Whether you use a VPN, proxy, or any software that controls your internet connection

Also try:

• Connecting to a different network (e.g., a mobile hotspot)
• Ensuring your firewall isn’t blocking the connection