How do you think Claude Code and OpenCode communicate with Anthropic? Through the API. Maybe it's accessed slightly differently for subscription users. Anthropic is saying you can't use the API via a subscription anywhere you want. Only Claude Code can use it that way.
OpenCode doesnt use the official API. It illegally bypasses it and pretends to be the Claude CLI app, which allows people who dont pay for API access to use it anyhow. That violates Anthropics TOS and robs them of income they rightfully should have had.
If you dont like a service or cant afford it dont use it. If you do and you can, be a paying customer.
You just repeated what I said in a different way. It is accessed differently, but it's still going to go through the same APIs at Anthropic. Maybe they have some differences or use different endpoints, but Anthropic didn't duplicate their entire business for CC vs official API users.