I'd like to use Opus with OpenCode right now to combine the best TUI agent app with the best LLM. But my understanding is Anthropic will nuke me from orbit if I try that.
You can use Opus with OpenCode anytime you want, just not with the Claude plan. You can use it via API with any provider, including Anthropic's API. You can use it with Github Copilot's plan. The only thing you can't do without getting banned is use OpenCode with one of Claude's plans.
If you want to use Opus with a different coding harness along with a coding plan, you can use Github CoPilot. It even has built in authentication with OpenCode.
I'm looking at their plans (https://github.com/features/copilot/plans) it seems like the limits might be pretty low, even with the Pro+ plan which is 2x the cost of Claude Pro. It seems like Claude Pro might be 10-20x the Opus tokens for only twice the price.
Copilot has a totally different billing model. It's request based rather than token based. Counter-intuitively, in our case at least, it is way cheaper than token based pricing. One request can sometimes consume 2-4 million tokens but is billed as a single request (or it's multiplier if using a premium model like opus).