Error on Anthropic models

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

When using Opus 4.6 model or Sonnet 4.6 i’m shown an error message of “We’re having trouble connecting to model provider”

Steps to Reproduce

Use Ask mode or Agent mode with any of the cited models

Operating System

Linux

Version Information

Version: 2.5.20 (user setup)
VSCode Version: 1.105.1
Commit: 511523af765daeb1fa69500ab0df5b6524424610
Date: 2026-02-19T20:41:31.942Z
Build Type: Stable
Release Track: Default
Electron: 39.4.0
Chromium: 142.0.7444.265
Node.js: 22.22.0
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

Opus 4.6 and Sonnet 4.6

For AI issues: add Request ID with privacy disabled

Request ID: 892a59af-0ccb-4a46-aba1-8cce797efd7c
{“error”:“ERROR_PROVIDER_ERROR”,“details”:{“title”:“Provider Error”,“detail”:“We’re having trouble connecting to the model provider. This might be temporary - please try again in a moment.”,“isRetryable”:false,“additionalInfo”:{},“buttons”:,“planChoices”:},“isExpected”:true}
Provider Error We’re having trouble connecting to the model provider. This might be temporary - please try again in a moment.
aXt: Provider Error We’re having trouble connecting to the model provider. This might be temporary - please try again in a moment.
at upA (vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32115:39729)
at cpA (vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32115:38717)
at fpA (vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32116:5088)
at uol.run (vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32116:9098)
at async art.runAgentLoop (vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:44360:7632)
at async wOl.streamFromAgentBackend (vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:44408:8884)
at async wOl.getAgentStreamResponse (vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:44408:9837)
at async ALe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:32182:15752)
at async Object.Js [as onSubmit] (vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:43415:4781)
at async vscode-file://vscode-app/c:/Users/Iwar/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:43389:58030

Additional Information

All other models work fine. Tried with gemini 3.1 pro and gpt 5.3 codex and kimi k2.5 and all of them work normally.

EDIT: The bug only happens to these Anthropic models in cursor. In Claude Code they are working perfectly

Does this stop you from using Cursor

No - Cursor works, but with this issue

3

Hey, this is a known issue we’ve been seeing this week specifically with Anthropic models. Please try the following:

  1. MCP servers: Go to Cursor Settings > Tools & MCP. If you have any MCP servers connected, temporarily disable all of them and reload the window. This has fixed it for most users with this error.

  2. Check API keys: Go to Cursor Settings > Models. Make sure Override OpenAI Base URL is turned off, and that there are no third party API keys set for Anthropic.

  3. Disable HTTP/2: Go to Cursor Settings > Network and turn on Disable HTTP/2.

  4. New chat: Try starting a new chat. Sometimes a lot of context, like images or long chats, can trigger this on Anthropic’s side.

If none of the above helps, run Cursor Settings > Network > Run Diagnostics and share the results here. Also let us know if you’re using a VPN or any corporate proxy.

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