OpenAI has previewed its new GPT-5.6 model family, which includes Sol Ultra, Sol, Terra, and Luna. The GPT-5.6 Sol Ultra model achieved a score of 91.9% on the TerminalBench 2.1 benchmark, surpassing Anthropic's Claude Mythos 5, which scored 88.0%. The Terra model offers performance comparable to GPT-5.5 at a reduced cost, while Luna is positioned as the most economical option. The new series also introduces enhanced reasoning capabilities with max reasoning and ultra modes. General availability is expected in the coming weeks, with an initial limited rollout to trusted partners. AI
IMPACT Sets new SOTA on coding benchmarks; pressures Anthropic to respond.
RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
AI-generated summary · Google Gemini · from 1 sources. How we write summaries →
