GPT-5.6 Deep Dive: OpenAI's 2026 Flagship, Sol/Terra/Luna Tiers, and the Agent Efficiency Play
GPT-5.6 is the model OpenAI trained to do more useful work per token - then priced so the middle tier costs half what the last flagship did. Sol hits 88.8% on Terminal-Bench 2.1 (91.9% in Ultra) and 53.6% on Agents' Last Exam, 13 points clear of Claude Fable 5. But it still loses SWE-bench Pro to Mythos 5. Here's the honest breakdown of what GPT-5.6 actually wins, what it doesn't, and where the three-tier pricing lands.
2026-07-21阅读时长 8 min