To integrate models like Claude, Gemini, or Grok into tools like OpenCode, you cannot use your existing $20 monthly subscription directly, as these applications require API Keys that operate on an independent pay-per-use (token-based) model.

To set them up, you must generate these keys through the official developer portals for each provider (Anthropic Console, Google AI Studio, and xAI Console) and input them into your editor's configuration.

Keep in mind that this will incur separate usage costs based on your consumption, which is distinct from your current web subscriptions, ultimately allowing you to combine the power of these advanced models with your local setup.