[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[bot]]

Found 3 possible duplicate issues:

1. https://github.com/anthropics/claude-code/issues/2542
2. https://github.com/anthropics/claude-code/issues/4138
3. https://github.com/anthropics/claude-code/issues/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) https://github.com/anthropics/claude-code/issues/5893#issuecomment-3193494349

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 https://github.com/anthropics/claude-code/issues/5893#issuecomment-3193494349, 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.

[Heavy02011]

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

worked for me thx!

[roblevintennis]

Worked for me on 2018 mac mini

[wukimidaire]

downgrading worked for me: npm install -g @anthropic-ai/[email protected]

[sijonelis]

Exit also worked on windows

[jloguercio]

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

LOL, works for me, thanks 😅!

[trungkien2003ntk]

So overall, after logged in successfully using /login, just exit claude code using /exit, then use claude to have it back on again and you're ready to go!

[yeongchani]

최신버전 깔았는데 왜 이럼 이거? 내 110달러 시발련들아

[iddogino]

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

LOL, works for me, thanks 😅!

Yep seems to work for me too

[justjustinma]

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

Thank you so much for the workaround!

However, I am on the lower Max Plan and it was not like this before.

---

● Claude Opus limit reached, now using Sonnet 4
  ⎿  API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently not supported."}}

Expected behavior After the Opus limit message, the conversation should continue automatically on Sonnet 4 without interruption (this is how it behaved previously).

Actual behavior Conversation halts with the 401 authentication error shown above.

---

Using the workaround means that I have to do /exit, claude, and /resume in the middle of every conversation where the model switches, which was something I didn't have to do before. This is mildly infuriating to have tasks interrupted all the time like this.

Request Keeping this issue open. The workaround restores functionality but does not address the root cause.

[marcoschipango]

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

worked for me thx! (win11)

[ysflghou]

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

That worked for me under Windows as well, thank you!

[ShcherbakovMikhailAH]

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

Thank you, only this works well.

[leo-zz-shuu]

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

worked for me, thx

[CatalanCabbage]

/exit worked for me

I was all pumped up after getting the subscription just to get slapped with this error smh

[swoopsus]

That worked a few times. But then stopped working. I get this error now on multiple pro accounts, multiple devices, all fully paid pro accounts.

[noelmateng]

/exit worked for me

I was all pumped up after getting the subscription just to get slapped with this error smh

Exactly my thought. I downgraded to 1.0.73 and its working well. Didn't face this issue since yesterday. Already used over 12 hours

[swoopsus]

Wow, thankyou! That actually worked. SO there is a ... bug ahem

[swoopsus]

CONFIRMED: This is a bug introduced in 1.0.82 and remains in 1.0.83. 1.0.81 is fine and does not have the bug.