Data snapshot: 11 July 2026
Primary source: Artificial Analysis GPT‑5.6 launch analysis and its live LLM leaderboard
Scope: all 15 combinations of Sol, Terra, and Luna at low, medium, high, xhigh, and max reasoning effort.
Short answer: Default to Luna for volume work and Sol when quality matters. Treat Terra as a dominated middle tier, not a default. Raise reasoning effort before moving to a larger model when the next effort remains on the better price/intelligence frontier. Use Sol
maxonly where the last few quality points can change the outcome.