Just checked https://opencode.ai/.
It looks like they need to update their FAQ:
Q: Do I need extra AI subscriptions to use OpenCode? A: Not necessarily, OpenCode comes with a set of free models that you can use without creating an account. Aside from these, you can use any of the popular coding models by creating a Zen account. While we encourage users to use Zen, OpenCode also works with all popular providers such as OpenAI, Anthropic, xAI etc. You can even connect your local models.
It still works with Claude Opus, just need to get a key from platform.claude.ai
That's not inaccurate. You can still use all of those providers: you just need to pay API costs, instead of reusing your subscription.