If you use pstack, here are the two prompts from the stream to pair Claude Opus 5.5 with Gemini 4 Argon in your pstack-models file. Option 1 checks which models you actually have, cleans up old role keys, and asks you to confirm before it writes anything. Option 2 just does it. Copy them from here: https://gist.github.com/RayFernando1337/5093a1d28437a45d098c3d829f5cf1ec Screenshots of both are attached below.