[BUG] In the middle of running I get `⎿ API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently not supported."}}`

[justjustinma]

In the middle of running I get:

⎿ API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently not supported."}}

I tried the solution below already:

/logout and log back in.

Originally posted by @adagradschool in #3624

I logged out and login again, then tried to resume the conversation, but I still encountered the same error.

[github-actions]

Found 3 possible duplicate issues:

1. Authentication Failure: OAuth Not Supported for Claude CLI #2542
2. API Error: 401 #4138
3. OAuth Token Refresh Failure During Active Session #2633

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

• If your issue is a duplicate, please close it and 👍 the existing issue instead
• To prevent auto-closure, add a comment or 👎 this comment

🤖 Generated with Claude Code

[stopar]

I have the same issue but unlike you I am trying to use Claude Code for the first time via my Claude Pro subscription and meet with this issue. Not the best first impression! 😔

[Gerrit740]

I am experiencing the same issue, API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently not supported."}}

[stopar]

Found 3 possible duplicate issues:

1. Authentication Failure: OAuth Not Supported for Claude CLI #2542

This first suggestion worked for me. Basically rm -rf ~/.claude and rm ~/.claude.json, then reopen my terminal and followed again claude instruction for Pro Subscription and after that it worked!

[noelmateng]

Tried all these steps but doesn't work.
Just got the subscription. I just want it to work

[FrostbiteBear]

Same issue
API Error: 401
{"type":"error","error":{"type":"authentication_error","message":"OAuth
authentication is currently not supported."}}

[FrostbiteBear]

I seem to have found a fix, for Ubuntu and macOS

1. /login

Complete those steps to get the API Error: 401

2. /exit (quit)
3. claude
4. Type any prompt and the 401 error goes away

[mohammad0720]

API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently
not supported."}}

[FrostbiteBear]

@mohammad0720 please try the above fix

[Gerrit740]

Restart your PC Regards Gerrit Van Wyk

…

On Sat, 16 Aug 2025, 10:23 am mohammad0720, ***@***.***> wrote: *mohammad0720* left a comment (anthropics/claude-code#5893) <#5893 (comment)> API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently not supported."}} — Reply to this email directly, view it on GitHub <#5893 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BT3F6BQAZ5QC6XHLKOMYZDL3N3S67AVCNFSM6AAAAACEA4Z46KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTCOJTGQ4TIMZUHE> . You are receiving this because you commented.Message ID: ***@***.***>

[noelmateng]

Downgrading to 1.0.73 worked for me.

[ninthspace]

Re-installing with npm install -g @anthropic-ai/claude-code worked for me.