Claude 4.5 Thinking model returning 404 errors in Cursor 2.0.69

shaggy2626 · November 10, 2025, 9:10pm

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

When using my own Anthropic API key, requests to sonnet 4.5 Thinking model fails with a 404 error. Other Claude models (like 3.5 Sonnet and Haiku) work fine. This just started happening about an hour ago. It was working fine an hour ago and then suddenly I started receiving the error.

Steps to Reproduce

Open Cursor Chat (Agent mode).
Set model to Claude 4.5 Thinking.
Use a valid Anthropic API key
Send any prompt.
Error immediately appears.

Expected Behavior

Claude 4.5 Thinking should respond normally using Anthropic’s endpoint.

Screenshots / Screen Recordings

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.69 (user setup)
VSCode Version: 1.99.3
Commit: 63fcac100bd5d5749f2a98aa47d65f6eca61db30
Date: 2025-11-07T18:21:29.650Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

claude-4.5-sonnet-thinking

For AI issues: add Request ID with privacy disabled

Request ID: bf28a049-64d0-4758-aeaf-9f17d1374dbb

Does this stop you from using Cursor

Yes - Cursor is unusable

ChadmCastilla · November 10, 2025, 10:03pm

getting same error

ChadmCastilla · November 10, 2025, 10:08pm

i turned off api and it is working

kvngil · November 10, 2025, 10:40pm

Having the same issue.

JV-Deepgram · November 10, 2025, 10:43pm

I’m having the same issue with Sonnet 4.5 and Sonnet 4 thinking models.

As a work around I had to switched to GPT-5 Codex, but it’s no where near as good as Sonnet. I fortunately have a OPEN AI API key to use with GPT-5 but for those who don’t they are probably stuck.

sanjeed5 · November 10, 2025, 10:47pm

Thanks for the report, I’ve raised it with the team.

skim · November 10, 2025, 11:19pm

Not sure if you have already diagnosed the issue; sharing my findings.

Claude Sonnet 4.5, Opus 4.1 are not working.

Haiku 4.5 is working.

Getting this error from request. I think it is trying to connect to OpenAI with my Anthropic API key

Request ID: 264f6031-039c-4176-9915-ee7993bf747d
{"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_011CUzw1dQTdpLbN8s3GPziP\"}\n```","additionalInfo":{},"buttons":[],"planChoices":[]},"isExpected":true}
ConnectError: [invalid_argument] Error
    at sJc.$endAiConnectTransportReportError (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4989:399337)
    at xwo._doInvokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:36007)
    at xwo._invokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:35749)

MuhammadYahya · November 11, 2025, 1:37am

Having the same issue of cursor trying to go to openai for claude 4.5 sonnet. 4.5 haiku works just fine.

{“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_011CV1F4gr1doo397Yzh5YC2\"}\n`”,“additionalInfo”:{},“buttons”:[ ],“planChoices”:[ ]},“isExpected”:true}
ConnectError: \[invalid_argument\] Error
at sJc.$endAiConnectTransportReportError (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:4989:399337)
at xwo.\_doInvokeHandler (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:492:36007)
at xwo.\_invokeHandler (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:492:35749)
at xwo.\_receiveRequest (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:492:34514)
at xwo.\_receiveOneMessage (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:492:33336)
at $Dt.value (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:492:31429)
at \_e.\_deliver (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)
at \_e.fire (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)
at dgt.fire (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:4974:12156)
at MessagePort. (vscode-file://vscode-app/nix/store/4v4jly9lx48sgyqvnf360n239zbyivg4-code-cursor-2.0-extracted/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7497:18439)```

Kevin_Jenish · November 11, 2025, 3:08am

From @skim’s observation, I was able to understand that the issue is because Cursor is reaching out to OpenAI’s API, and there is an internal system in Cursor which will route all models with the prefix claude- to Anthropic.

So as a temporary fix, go to Cursor settings > models and add a custom model, and enter “claude-sonnet-4-5”. And select this model in the editor while sending out requests; this will route to Anthropic API and you can temporarily use this until the Cursor team fixes this.

Maddie_Wang · November 11, 2025, 3:08am

HAVING THIS ERROR TOO!!!

VECHKASOV · November 11, 2025, 3:08am

the situation is similar

Kevin_Jenish · November 11, 2025, 3:16am

Check the Fix I mentioned above.. @Maddie_■■■■ @VECHKASOV

skim · November 11, 2025, 4:13am

thanks @Kevin_Jenish

claude-sonnet-4-5-thinkingcustom model works as well

obanach · November 10, 2025, 8:51pm

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

When I try to use any anthropic model while having Anthropic API Key set it returns:

We encountered an issue when using your API key: Provider was unable to process your request
API Error: Request failed with status code 404: {“type”:“error”,“error”:{“type”:“not_found_error”,“message”:“model: claude-4.5-sonnet”},“request_id”:“req_011CUzryhV1CNPZaaGSS9pji”}

However, when I disable my API key, it works normally.

I also added a custom model entry manually (claude-sonnet-4-5), and in that case it works correctly and I can see the usage in the Anthropic dashboard at https://console.anthropic.com.

Steps to Reproduce

Add your Anthropic API Key and turn it on
Make request with Sonnet 4.5

Screenshots / Screen Recordings

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.69
VSCode Version: 1.99.3
Commit: 63fcac100bd5d5749f2a98aa47d65f6eca61db30
Date: 2025-11-07T18:21:29.650Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 25.0.0

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

shaggy2626 · November 11, 2025, 4:54am

I think cursor already fixed it, I just tested again without making the custom model and it worked. Try on your end

kvngil · November 10, 2025, 9:23pm

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

This is a repeat of:

and seems related to this:

github.com/cursor/cursor

Bug: Incorrect "Unauthorized OpenAI API key" error when using a personal Gemini API key

opened 03:29AM - 19 Jul 25 UTC

jorell-hub

NOTE: We will try our best to check Github Issues, but [forum.cursor.com](https:…//forum.cursor.com/) is our main site for bug reports / user feedback. We'd recommend you post there for the fastest response. ### Description When attempting to use a Gemini model (e.g., `gemini-2.5-pro`) with a personal Google API key, the editor incorrectly throws an "Unauthorized User Openai API key" error. This indicates that the request is being mistakenly routed to an OpenAI authentication endpoint instead of the Google/Gemini endpoint. ### Steps to Reproduce 1. Navigate to `Settings` > `API Keys` in Cursor. 2. Enter a valid Google API key in the "Google API Key" field and ensure the toggle to use it is enabled. 3. Ensure the "OpenAI API Key" field is empty. 4. In a chat pane, select a Gemini model from the dropdown, such as `gemini-2.5-pro`. 5. Try to send any prompt to the model. 6. Observe the error message that appears. ### Expected Behavior The request should be successfully sent to the Gemini API using the provided Google API key, and a valid response from the model should be received. ### Actual Behavior An error message is immediately displayed: `Unauthorized User Openai API key`. The request fails and is not processed. **Example Request ID:** `5f03da8d-3d0b-421d-aab4-c2da46826fd8` ### Screenshots *(Please see the attached screenshots showing my API key configuration, the selected Gemini model, and the resulting error message.)* ### Environment - **Cursor Version:** 1.2.2 - **Operating System:** Windows - <img width="1458" height="545" alt="Image" src="https://github.com/user-attachments/assets/488a7e9e-d146-4e20-a28d-a61ce70ca51c" />

Error logs:

Request ID: 5d58fe43-454c-425c-b351-670826efe56a
{“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_011CUzuL7yCiTnkSgfwz4hFb\"}\n”,“additionalInfo”:{},“buttons”:,“planChoices”:},“isExpected”:true}
ConnectError: [invalid_argument] Error
at sJc.$endAiConnectTransportReportError (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4989:399337)
at xwo._doInvokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:36007)
at xwo._invokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:35749)
at xwo._receiveRequest (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:34514)
at xwo._receiveOneMessage (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:33336)
at $Dt.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 dgt.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:7497:18439)

Steps to Reproduce

custom anthropic key
try to make a request

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.69
VSCode Version: 1.99.3
Commit: 63fcac100bd5d5749f2a98aa47d65f6eca61db30
Date: 2025-11-07T18:21:29.650Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 24.2.0

For AI issues: which model did you use?

claude-4.5-sonnet

For AI issues: add Request ID with privacy disabled

Request ID: 5d58fe43-454c-425c-b351-670826efe56a
{“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_011CUzuL7yCiTnkSgfwz4hFb\"}\n”,“additionalInfo”:{},“buttons”:,“planChoices”:},“isExpected”:true}
ConnectError: [invalid_argument] Error
at sJc.$endAiConnectTransportReportError (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4989:399337)
at xwo._doInvokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:36007)
at xwo._invokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:35749)
at xwo._receiveRequest (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:34514)
at xwo._receiveOneMessage (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:33336)
at $Dt.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 dgt.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:7497:18439)

Does this stop you from using Cursor

Yes - Cursor is unusable

Joe_Zeng · November 10, 2025, 11:35pm

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

I use clause api key for claude models in cursor but it has 404, it was working this morning.

Request ID: 824b3a84-f510-4835-b62c-862ef487122b
{“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_011CV15S8wpbbVqzmStfJAME\"}\n”,“additionalInfo”:{},“buttons”:,“planChoices”:},“isExpected”:true}
ConnectError: [invalid_argument] Error
at sJc.$endAiConnectTransportReportError (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4989:399337)
at xwo._doInvokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:36007)
at xwo._invokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:35749)
at xwo._receiveRequest (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:34514)
at xwo._receiveOneMessage (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:492:33336)
at $Dt.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 dgt.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:7497:18439)

Steps to Reproduce

use anthropic api key

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.69
VSCode Version: 1.99.3
Commit: 63fcac100bd5d5749f2a98aa47d65f6eca61db30
Date: 2025-11-07T18:21:29.650Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 25.0.0

Does this stop you from using Cursor

Yes - Cursor is unusable

user1127 · November 11, 2025, 2:49am

same thing started from today
but custom model `claude-sonnet-4-5-20250929` works!

MuhammadYahya · November 11, 2025, 5:09pm

The issue for me has been resolved

hmeng · November 11, 2025, 8:33pm

same here, still not fixed

@austinp can we expedite this one?

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Claude 4.5 Thinking model returning 404 errors in Cursor 2.0.69

Where does the bug appear (feature/product)?

Describe the Bug

Steps to Reproduce

Expected Behavior

Screenshots / Screen Recordings

Operating System

Current Cursor Version (Menu → About Cursor → Copy)

For AI issues: which model did you use?

For AI issues: add Request ID with privacy disabled

Does this stop you from using Cursor

Where does the bug appear (feature/product)?

Describe the Bug

Steps to Reproduce

Screenshots / Screen Recordings

Operating System

Current Cursor Version (Menu → About Cursor → Copy)

Does this stop you from using Cursor

Where does the bug appear (feature/product)?

Describe the Bug

Steps to Reproduce

Operating System

Current Cursor Version (Menu → About Cursor → Copy)

For AI issues: which model did you use?

For AI issues: add Request ID with privacy disabled

Does this stop you from using Cursor

Where does the bug appear (feature/product)?

Describe the Bug

Steps to Reproduce

Operating System

Current Cursor Version (Menu → About Cursor → Copy)

Does this stop you from using Cursor

Related topics