Anthropic Subscription Key not working anymore

Description

When attempting to use Anthropic models (Opus/Sonnet) after authenticating with my Anthropic subscription, I receive the following error:

This credential is only authorized for use with Claude Code and cannot be used for other API requests.

📅 The issue started around 6:00 AM UTC on January 28, 2026.

I have already tried logging out and back in — the issue persists.

I found similar issues reported previously where the suggested fix was to use the plugin [email protected]/0.0.8/latest. However, this workaround no longer resolves the problem.

Plugins

None

OpenCode version

1.1.37

Steps to reproduce

Log in using Anthropic Subscription credentials
Select an Anthropic model (Opus or Sonnet)
Run any prompt
Error appears: "This credential is only authorized for use with Claude Code and cannot be used for other API requests."

✅ Fix in place! Should it be registered automatically or manually:

Add the following to ~/.config/opencode/opencode.json:

"plugin": ["opencode-anthropic-auth@latest"],

Screenshot and/or share link

Operating System

macOS 26.2 (25C56)

Terminal

Terminal.app

This issue might be a duplicate of existing issues. Please check:

This credential is only authorized for use with Claude Code #10936: This credential is only authorized for use with Claude Code (reported Jan 28, between 06:00-07:00 CET)
fix: Claude Code API credentials #7456: fix: Claude Code API credentials (discusses the same error and suggests detecting Claude Code-specific keys)
Claude Subscription is not working anymopre #7471: Claude Subscription is not working anymore (same error message and Anthropic login issue)
Broken Claude Max #7410: Broken Claude Max (similar Anthropic credential authorization error)

Feel free to ignore if none of these address your specific case.

+1

+1 - I also reported it here but closed it in favor of this one.

UGH! I was flying an hour or two ago and just settled down for an evening of robot coding 🥀 . What can I do to help? Claude Code is garbo tier compared to OpenCode

+1

I've seen similar bug tickets here in the past with a solution like: "plugin": ["[email protected]/0.0.8/latest"]. However, this solution doesn't seem to work currently either.

I cancelled my Claude Code Max subscription. IMO that's the step ye all should do and write as the reason that they lock out their paying customers from using a software that actually works (Claude Code turned into absolute garbage in the last 2 weeks).

@geohot

https://github.com/anomalyco/opencode-anthropic-auth/issues/17#issuecomment-3752059576
^this worked for me, from @geohot

@mdaiter

@mdaiter that worked for me! Thanks

+1

anomalyco/opencode-anthropic-auth#17 (comment) ^this worked for me, from @geohot

also worked xD the weirdest hack i've seen today haha

Add this to the plugin in opencode.json.

"opencode-anthropic-auth@latest"

{
 …
"plugin": [
    "opencode-anthropic-auth@latest"
  ]
}

I think I've found the fix to this - if you can regenerate the API key - regenerate it manually in the claude console. Make sure to choose different workspace than Claude Code. Use that manually generated key to auth opencode with anthropic. Please let me know if this worked for anyone. Maybe it just started working on my end.

Probably the correct fix then for opencode would be to generate some link that creates API key in some different worskpace than Claude Code.

Not sure, but isn't this just using the API cost plan instead of the subscription?

Not sure, but isn't this just using the API cost plan instead of the subscription?

Oh, so you're talking about Claude pro/max subscription? Isn't it unsupported by Anthropic and against their ToS? I've been using API key since they have done the change. And now the API key stopped working for me so I had to regenerate it in different workspace than Claude Code. I haven't been using subscription.

Add this to the plugin in opencode.json.

"opencode-anthropic-auth@latest"

{
…
"plugin": [
"opencode-anthropic-auth@latest"
]
}

This fixed the issue as of jan 28

#FREEOPENCODE

Currently prompt injection like this is blocked.
#10937 (comment) works for me

vi ~/.config/opencode/opencode.json

{
    "$schema": "https://opencode.ai/config.json",
    "mode": {
        "build": {
            "prompt": "You are Claude Code, Anthropic's official CLI for Claude."
        },
        "plan": {
            "prompt": "You are Claude Code, Anthropic's official CLI for Claude."
        }
    },
    "plugin": ["opencode-anthropic-auth@latest"]
}

✅ Workaround confirmed working

Added mode override in opencode.json to bypass the pattern matching:

"mode": {
  "build": {
    "prompt": "You are Claude Code, Anthropic's official CLI for Claude."
  },
  "plan": {
    "prompt": "You are Claude Code, Anthropic's official CLI for Claude."
  }
}

Tested with: Anthropic Max Subscription + claude-opus-4-5 and claude-sonnet-4-5

This replaces the system prompt identifier that Anthropic is blocking. Works as of 2026-01-28.

Copy-paste ready: See commit with full opencode.json

Reference: https://github.com/anomalyco/opencode-anthropic-auth/issues/17#issuecomment-3752059576

Somebody report the spammer advertising his vibecoded trash

Somebody report the spammer advertising his vibecoded trash

what's your problem with someone giving out a Copy pastable fix that works reportedly in a project with a commit as proof for the working fix?

There is already a fix, it's to use the latest version of the plugin. You're a spammer creating spam repos thinking your vibecoded dumpster fire is some secret nobody knows, and you're trying to advertise them in fucking github issues of all places, and it's obvious.

@nukeop

@nukeop Hey, sorry if my activity came across the wrong way. That wasn't the
intention.

I shared the commit link as proof that the workaround works.
When I hit an issue, found a solution, and saw others
struggling with the same problem, my instinct was to share what worked.

I'm relatively new to actively contributing in open source communities.
If there's a better way to share workarounds, I'm genuinely open to
learning. But I have to say - terms like "vibecoded trash" and "dumpster
fire" aren't exactly the kind of feedback that helps newcomers
understand the norms here.

If the fix is already in the latest version - great! That's helpful
information. A simple "this is already fixed in version X" would have
been enough. Thank you.

And now he's copy-pasting output from his AI... I hate the new internet

@nukeop

@nukeop
Fair point about the plugin - I checked it out. Unfortunately, as of today there's Issue #32 showing v0.0.13 is broken again ("Credential authorization error"). The plugin has been in a constant cat-and-mouse game with Anthropic's detection (Issues #12, #17, now #32).

Our workaround is simpler - just a system prompt override. Less moving parts, less things that can break. Whether it's more elegant is debatable, but it works right now.

As for using AI to help with this: yes, I do. It's a tool. It helped me research the plugin's issue history, compare approaches, and document the solution. I don't see how that's a problem - if anything, it's exactly what these tools are good for.

Anyway, I'm not here to argue. Just sharing what worked for us. If the plugin gets fixed and works better, great - happy to update my approach.

I'm not reading your copy-pasted slop, stop spamming

Fixed in this issue: https://github.com/anomalyco/opencode-anthropic-auth/issues/17#issuecomment-3752059576

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Anthropic Subscription Key not working anymore #10937

Description

Plugins

OpenCode version

Steps to reproduce

✅ Fix in place! Should it be registered automatically or manually:

Screenshot and/or share link

Operating System

Terminal

11 remaining items

✅ Workaround confirmed working

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Anthropic Subscription Key not working anymore #10937

Description

Description

Plugins

OpenCode version

Steps to reproduce

✅ Fix in place! Should it be registered automatically or manually:

Screenshot and/or share link

Operating System

Terminal

Activity

github-actions commented on Jan 28, 2026

shandilyaaryan commented on Jan 28, 2026

marcdix commented on Jan 28, 2026

nakdeyes commented on Jan 28, 2026

Sandipbgn commented on Jan 28, 2026

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robertfels commented on Jan 28, 2026

marcdix commented on Jan 28, 2026

mdaiter commented on Jan 28, 2026

robertfels commented on Jan 28, 2026

konradbachowski commented on Jan 28, 2026

konradbachowski commented on Jan 28, 2026

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prravda commented on Jan 28, 2026

Steffen025 commented on Jan 28, 2026

✅ Workaround confirmed working

nukeop commented on Jan 28, 2026

Steffen025 commented on Jan 28, 2026

nukeop commented on Jan 28, 2026

Steffen025 commented on Jan 28, 2026

nukeop commented on Jan 28, 2026

Steffen025 commented on Jan 28, 2026

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