Summary

Using Hermes with Anthropic/Claude subscription auth initially worked after installation and setup, but after some time it stopped working consistently with:

HTTP 400: You're out of extra usage. Add more at claude.ai/settings/usage and keep going.

This persists after restarting Hermes and re-logging into Claude auth.

Important clarification

This was not broken from the beginning.

• Hermes was installed and configured successfully
• Anthropic/Claude subscription auth worked at first
• After a period of normal use, Hermes started returning the extra usage 400 consistently
• After that point, restart + re-login did not recover it

What makes this confusing

• Claude Desktop still works on the same account
• Hermes had worked before, so this does not look like a simple setup mistake
• Hermes fails on Anthropic models through https://api.anthropic.com
• Switching models inside Hermes did not help
• Restarting Hermes and re-login did not help

This makes it look like Hermes' Anthropic subscription/OAuth path may be hitting a different usage gate than Claude Desktop, or Hermes is not handling/reporting that state clearly.

Environment

• Hermes version: 0.8.0 (2026.4.8)
• Provider: anthropic
• Models tested:
  • anthropic/claude-opus-4-6
  • claude-sonnet-4-6
• Endpoint: https://api.anthropic.com
• Platform: macOS

Reproduction

1. Install and configure Hermes with Anthropic/Claude subscription auth
2. Use Hermes normally, successfully, for some period of time
3. Later, send a normal prompt
4. Hermes starts returning the error below
5. Restart Hermes and re-login
6. Try again, same result
7. Switch from Opus to Sonnet
8. Try again, same result

Actual result

⚠️ API call failed (attempt 1/3): BadRequestError [HTTP 400]
🔌 Provider: anthropic Model: claude-sonnet-4-6
🌐 Endpoint: https://api.anthropic.com
📝 Error: HTTP 400: You're out of extra usage. Add more at claude.ai/settings/usage and keep going.
📋 Details: {'type': 'error', 'error': {'type': 'invalid_request_error', 'message': "You're out of extra usage. Add more at claude.ai/settings/usage and keep going."}, 'request_id': ''}
⚠️ Non-retryable error (HTTP 400) — trying fallback...
❌ Non-retryable error (HTTP 400): HTTP 400: You're out of extra usage. Add more at claude.ai/settings/usage and keep going.
❌ Non-retryable client error (HTTP 400). Aborting.
🔌 Provider: anthropic Model: claude-sonnet-4-6
🌐 Endpoint: https://api.anthropic.com
💡 This type of error won't be fixed by retrying.

Relevant log observations

From Hermes logs, this happened repeatedly over several hours, including after restart:

• 12:08:38 extra usage 400
• 12:16:55 extra usage 400
• 12:25:39 extra usage 400
• 12:41:30 extra usage 400 after switching to Sonnet
• 15:09:25 extra usage 400

There is also a successful in-place model switch in logs, but the error persists:

Model switched in-place: anthropic/claude-opus-4-6 (anthropic) -> claude-sonnet-4-6 (anthropic)

Expected result

One of these should happen:

1. Hermes works if Claude subscription auth is still valid for this path
2. Hermes surfaces a clearer message explaining that Anthropic subscription/OAuth usage is exhausted specifically for third-party/Hermes usage
3. Hermes offers a more explicit fallback path or guidance, since this is easy to confuse with a Hermes bug

Question

Is this an expected limitation of Anthropic subscription/OAuth usage in Hermes, or is Hermes currently routing these requests in a way that hits a separate usage limit from Claude Desktop?