Many people use the Max subscription OAuth token in OpenClaw. The main chat, heartbeat, etc., functionality does not call the Claude Code CLI. It uses the API authenticated via subscription OAuth tokens, which is precisely what Anthropic has banned.

There are many other options too: direct API, other model providers, etc. But Opus is particularly good for "agent with a personality" applications, so it's what thousands of OpenClaw users go with, mostly via the OAuth token, because it's much cheaper than the API.