Fixing "invalid token" in OpenCode: A Working Claude (Anthropic) OAuth Solution

rokeyxuhleremny1 — Fri, 20 Mar 2026 17:48:02 +0000

If you're using OpenCode with Anthropic’s Claude and suddenly started seeing errors like:

invalid token
authentication failed
unauthorized request

You're not alone.

But here's the good news — there is a working solution, and you can get everything running again in just a couple of minutes.

🚀 The Solution (Works Right Now)

I built a small open-source plugin that restores Claude access inside OpenCode using OAuth:

👉 https://github.com/rokeyxuhleremny1/invalid-token-opencode

What it does

Lets you log in with your Claude Pro / Max account
Restores access to all Anthropic models
Fixes broken token flows
Requires no Claude Code installation
Handles authentication automatically

⚡ Quick Setup

Install the plugin:

npm install -g opencode-anthropic-oauth

Add it to your config:

{
  "plugin": ["opencode-anthropic-oauth"]
}

Then run:

/connect

or:

oc auth login

Select:

Anthropic → Claude Pro/Max

Complete the browser login → paste the code → done.

✅ Claude is working again.

🧠 How It Works

Instead of relying on broken token handling, this plugin:

Uses OAuth (PKCE flow)
Authenticates via browser (secure login)
Exchanges auth code for access + refresh tokens
Automatically refreshes tokens
Injects correct API headers into OpenCode

👉 Result: stable, working integration with Anthropic again.

🔑 Alternative Option

If you want something more “official”:

Use Anthropic API keys
Pay-as-you-go
No dependency on subscription tokens

But for many users, OAuth is the fastest way to get back up and running.

⚠️ Important Disclaimer

This solution uses Anthropic’s public OAuth client.

According to their Terms of Service (Feb 2026):

Subscription tokens are intended for official clients only

This is a community workaround and may stop working if things change.

💥 What Actually Happened (Why Everything Broke)

Recently, Anthropic changed how authentication works.

This caused:

OpenCode integrations to fail
Tokens from Claude Pro/Max to stop working
Massive “invalid token” errors across the community

In short:

👉 You could no longer use your subscription tokens outside official tools.

This broke workflows for a lot of developers using:

OpenCode
Cursor
custom clients

🧾 Final Thoughts

AI tooling is moving fast — and sometimes platforms lock things down.

When that happens, the community adapts.

This plugin is one of those adaptations — simple, practical, and working right now.

If this helped you, feel free to ⭐ the repo: