OpenCode appears to be pretty interesting and could be worth investigating further. Even though Anthropic blocked Claude subscriptions on it, afterwards GitHub Copilot announced official support for it, so you can still access Opus via Copilot credits. At first glance I was able to copy my ~/.claude/commands to ~/.opencode/commands and they appeared to just work (with Opus via Copilot). The larger benefit of opencode would be testing other models that Claude Code does not support, notably local models.