[BUG] Anthropic disabled OAuth tokens for third-party apps

[Pichardescu]

Preflight Checklist

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

What's Wrong?

OAuth tokens (sk-ant-oat*) no longer work for API access — paying subscribers locked out

As of ~Feb 20 2026, OAuth workspace tokens generated via claude setup-token (prefix sk-ant-oat01-*) are rejected by the API:

• Via x-api-key: "invalid x-api-key"
• Via Authorization: Bearer: "OAuth authentication is currently not supported."

This means Max/Pro subscribers paying $200/month cannot use their tokens for third-party integrations. Only console API keys (sk-ant-api03-*) with separate pay-per-use billing work.

No prior notice was given. This is a breaking change that affects anyone building on top of Claude outside the official apps.

No 1M context window for $200/month, no use of the API Key for developing third party apps. This is the last month I pay for your subscription, there are already much better options out there.

What Should Happen?

Use our payed limits for any aplicación of the model

Error Messages/Logs

- Via `x-api-key`: `"invalid x-api-key"`
- Via `Authorization: Bearer`: `"OAuth authentication is currently not supported."`

Steps to Reproduce

Use the API with the OAuth token

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.51

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

No response

[github-actions]

Found 3 possible duplicate issues:

1. [BUG] Anthropic disabled OAuth tokens for third-party apps #28089
2. [BUG] Remote Web session cannot be created using CLAUDE_CODE_OAUTH_TOKEN #27848
3. [Question] OAuth/setup-token policy for scheduled CI/CD automation (GitHub Actions, GitLab CI) #27125

This issue will be automatically closed as a duplicate in 3 days.

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🤖 Generated with Claude Code

[github-actions]

This issue has been automatically closed as a duplicate of #28089.

If this is incorrect, please re-open this issue or create a new one.

🤖 Generated with Claude Code

[github-actions]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.