Same here, it’s been 48 hours and has not been fixed.
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@sanjeed5 @deanrie any updates on this one?
Request failed with status code 404: {“type”:“error”,“error”:{“type”:“not_found_error”,“message”:“model: claude-4.5-sonnet”},“request_id”:“req_011CV4fSK1mWnrHQupWH98vc”}
Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
BYOK, specifically the claude key isn’t working in cursor
Steps to Reproduce
- Enable anthropic api key
- Try claude 4.5 reasoning/thinking
- Error
Expected Behavior
Claude 4.5 thinking to work
Operating System
MacOS
Current Cursor Version (Menu → About Cursor → Copy)
Version: 2.0.75 (Universal)
VSCode Version: 1.99.3
Commit: 9e7a27b76730ca7fe4aecaeafc58bac1e2c82120
Date: 2025-11-12T17:34:21.472Z
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?
Sonnet 4.5 thinking
For AI issues: add Request ID with privacy disabled
Request ID: 7b30ff1b-8757-470f-9087-720ac9434cd4
{"error":"ERROR_OPENAI","details":{"title":"Unable to reach the model provider","detail":"We encountered an issue when using your API key: Provider was unable to process your request\n\nAPI Error:\n\n```\nRequest failed with status code 404: {\"type\":\"error\",\"error\":{\"type\":\"not_found_error\",\"message\":\"model: claude-4.5-sonnet\"},\"request_id\":\"req_011CV6erhBLGeczoZ5dh7smx\"}\n```","additionalInfo":{},"buttons":[],"planChoices":[]},"isExpected":true}
Does this stop you from using Cursor
Sometimes - I can sometimes use Cursor
Try going to Cursor settings → Models → Api key and play with the API URL options, it seems to be bugged.
What I did: enable Override OpenAI Base URL and delete anything in there, disable Override URL, disable OpenAI API key option, disable Anthropic API Key and enable it again. Then Sonnet 4.5 started working again for me.
Didn’t help, but thanks!
@hmeng does this work for you?
it does & I’m using that with BYOK, but it’s not evident if that’s the thinking model or not - either way we should re-route the main model haha
I encountered the same problem，There is currently no solution available
Update on my previous reply: It seems that Cursor keeps randomly turning on the “Override OpenAI Base URL” which (even with OpenAI API key setting disabled) breaks Anthropic models using Anthropic API key. Currently, when I disable this option, Claude works again but after a while the option magically turns on again and it breaks.
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I’ve just encountered the same problem 
And “anthropic/claude-sonnet-4.5” doesn’t work with OpenRouter either
@sanjeed5 can we prioritize this as people are noting above?
@Plasmoxy +1 on that, I’ve noticed those things as well - in general there needs be a better BYOK setup, consider creating a dedicated bug report on that? we can follow up on it.
Still have the same issue since the start of Nov 2025,
Latest version of a cursor at this time,
Sonnet 4.5 thinking model works only when custom Api key is disabled (when over price mode, it looks not fair),
When custom api key is enabled it returns an error (Request failed with status code 404: {“type”:“error”,“error”:{“type”:“not_found_error”,“message”:“model: claude-4.5-sonnet”},“request_id”:“req_011CVUcGx7Ah4gbi8WJM63x9”})
Like i’m using open ai.
I tried to add custom model , but it can not be added in correct way, it disappears and just ignore my tries to add this 3 models:
claude-sonnet-4-5-20250929
claude-sonnet-4-5-20250929-thinking
claude-opus-4-1-20250805
(like it’s already added, but it appears in models selector, but don’t appear in models settings tab, and thinking model doesn’t appear, so I don’t have a correct way to use custom api key and only have a way to use overprice cursor mode)
I also would like to request Cursor support to cover my spends for the November 2025 for on demand usage. Thanks.
I think I’ve figured out the issue, right now using the opus/sonnet works but every time the chat starts the Override OpenAI Base url turns ON and you have manually turn it off every time.
If you decide to the delete the url, then we get the error above.
Can we prioritize this fix? @deanrie as well
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hi @Stepan_Turchenko could you please email [email protected] about your request?
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