Have you used before a pro or max account?

For now yes, but not forever (that's what I meant before). It's not a new model, but Opencode is about to launch opencode Black, and the plans seem to be similar to Claude: https://github.com/anomalyco/opencode/commit/e146083b73e0d8f2a33570e24672176d0811d663#diff-6bd523e0dbe998b346d98399f2e7af3c0ca5...