Yes, although OpenCode works great with official Claude API keys that are on normal API pricing.

What Anthropic blocked is using OpenCode with the Claude "individual plans" (like the $20/month Pro or $100/month Max plan), which Anthropic intends to be used only with the Claude Code client.

OpenCode had implemented some basic client spoofing so that this was working, but Anthropic updated to a more sophisticated client fingerprinting scheme which blocked OpenCode from using this individual plans.