Which model should I use for different parts of a small MMO?

A developer is building a small MMO using ChatGPT/Codex and is seeking advice on model selection. They want to know when to use Astra and when Sol Medium/High is sufficient for features like inventory, quests, NPCs, chat, shops, progression, combat systems, admin tools, and multiplayer/backend work. The developer is considering using Sol for most features and Astra for the hardest systems, debugging, and final polish.

This post uniquely details a developer's specific dilemma in choosing between Astra and Sol Medium/High for different components of an MMO, unlike general discussions on AI model capabilities.