I started with Codex, then switched to OpenCode, then switched to Codex.

OpenCode just has more bugs, it's incredibly derivative so it doesn't really do anything else than Codex.

The advantage of OpenCode is that it can use any underlying model, but that's a disadvantage because it breaks the native integration. If you use Opus + Claude Code, or Gpt-Codex + Codex App, you are using it the way it was designed to be used.

If you don't actually use different models, or plan to switch, or somehow value vendor neutrality strategically, you are paying a large cost without much reward.

This is in general a rule, vendor neutrality is often seen as a generic positive, but it is actually a tradeoff. If you just build on top of AWS for example, you make use of it's features and build much faster and simpler than if you use Terraform.