You pay for snacks in the cinema and they lose money if you buy elsewhere. Where does Anthropic lose money when I use OpenCode?

This has been explained many times in this thread. Your subscription to Claude models for use in Claude Code is subsidized. That is, it is only meant to be used with that harness.

When you use that API key with OpenCode, you're circumventing that.

That doesn't make sense.

The PS5 is subsidized because the make money with the games.

Printers are subsidized because the make money with the ink.

The API use is subsidized because they make money with Claude Code? I would understand if Claude Code could only be used with Anthropics API but not the other way around. 1 million tokens is 1 million tokens unless Claude Code is burning tokens and others are more efficient in token use.

They want you to become dependent on Claude Code, so that later they can milk you.

I'd say that they want Claude Code to become the standard, so that they can milk corporations on enterprise plans. We individual subscribers are nothing, but we'll go to work and be vocal about specifically having Claude.

The AI companies can spare their whining about contempt of business model. They're selling a service.