Anthropic employees clarified in HN comment threads that the API credits are in addition to the existing behavior and not a replacement. Other harnesses can still call the Claude Code CLI and use the subscription quota that way.
"the Claude Agent SDK and claude -p still draw from your subscription limits"
https://support.claude.com/en/articles/15036540-use-the-clau...
"the Claude Agent SDK and claude -p still draw from your subscription limits"
https://support.claude.com/en/articles/15036540-use-the-clau...