OpenAI unveils GPT‑5.6: higher IQ per token, up to 75% cheaper performance
OpenAI today released the GPT‑5.6 family—Sol, Terra, and Luna—claiming state‑of‑the‑art performance on coding, knowledge work, cybersecurity, and science at dramatically lower token cost. In the Agents’ Last Exam benchmark Sol hits 53.6, outpacing Claude Fable 5 by over 13 points while cutting estimated spend to a quarter. The rollout also adds the ‘ultra’ setting for multi‑agent parallelism and the strongest safety layers yet.