[BUG] VS Code extension (official) not recognizing pro plan credentials on login - 400 error

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Bug Description:
VS Code extension authentication succeeds but API calls fail with credential error

Steps to Reproduce:

1. Install Claude Code VS Code extension (anthropic.claude-code)
2. Sign in using "claude.ai subscription" option with Claude Code Pro account
3. OAuth flow completes successfully
4. Attempt to send a message in the extension
5. Receive error: "This credential is only authorized for use with Claude Code and cannot be

used for other API requests"

Error Message:
API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"This
credential is only authorized for use with Claude Code and cannot be used for other API
requests."}

Environment:

• VS Code Extension Version: [check your version]
• VS Code Version: [your version]
• OS: macOS 14.6.0
• Claude Code CLI Version: 2.0.42 (working fine)

Notes:

• This worked perfectly for 2 months until November 16, 2025
• CLI authentication works fine with same Pro account
• Only VS Code extension is affected

What Should Happen?

I should be able to authenticate as I have done for the last three months when I log in via the official Claude Code extension in VS Code. It just won't log in and it gives me that error.

Error Messages/Logs

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"This credential is only authorized for use with Claude Code and cannot be used for other API requests."},"request_id":"req_011CVCM7uDirhDmU17TRaX3z"}

Steps to Reproduce

Steps to Reproduce

1. Have an active Claude Code Pro subscription
2. Install the Claude Code VS Code extension from the

marketplace (anthropic.claude-code)

1. Open VS Code and click the Claude Code (Spark) icon in

the sidebar

1. Click "Sign in"
2. Select "Sign into claude.ai subscription" from the login

options

1. Complete the OAuth flow in the browser (authorize

access)

1. Verify the browser shows success message ("build

something great together")

1. Return to VS Code - the extension should show as

authenticated

1. Open the Claude Code chat panel in VS Code
2. Type any simple prompt (e.g., "Hello, can you help

me?")

1. Press Enter to send

Expected Result: Claude should respond to the message

Actual Result: API Error occurs:
API Error: 400 {"type":"error","error":{"type":"invalid_req
uest_error","message":"This credential is only authorized
for use with Claude Code and cannot be used for other API
requests."},"request_id":"req_011CVCM7uDirhDmU17TRaX3z"}

## Additional Context

• This issue started on November 16, 2025
• The same Pro account works perfectly fine in Claude Code

CLI (version 2.0.42)

• The extension was working correctly for 2 months prior to

this date

• OAuth authentication flow completes successfully - the

error only occurs when making API calls

• No code files are needed to reproduce - this is purely an

authentication/API issue

## Environment

• VS Code Extension: Claude Code (anthropic.claude-code)

v[YOUR VERSION - check in Extensions]

• VS Code Version: [YOUR VERSION - Help > About]
• OS: macOS (Darwin 24.6.0)
• Claude Code CLI: 2.0.42 (working correctly)

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.42

Claude Code Version

2.0.42 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

This just started happening today. Everything has been fine for the last two months or three months that I've been using this.