Can open-source harnesses use Claude Pro/Max login instead of Claude Code?
A developer heard a rumor that Anthropic will soon allow Pro/Max login to be used in harnesses (tools that call s outside Anthropic's own apps) like Pi Agent or OpenCode, but found no official confirmation of this. Right now, using a Pro/Max login in these harnesses is technically possible, but when Anthropic detects it, it switches the billing from the 's included usage to extra usage charges instead. The person prefers working with an tool stack rather than Anthropic's own and asked the community if anyone has clearer information on where this stands.
Key points
- Using Pro/Max login in harnesses like Pi Agent or OpenCode is technically possible today
- Anthropic detects this usage and switches billing to extra usage instead of -included usage
- There's a rumor Anthropic will officially allow this, but no confirmed announcement exists
- The poster prefers an tool stack over Anthropic's own