OpenAI on June 26 unveiled GPT-5.6, a family of three models — Sol, Terra, and Luna — covering flagship to budget tiers. In a break from past launches, the company held back access to approximately 20 trusted organizations, citing a request from the US government tied to President Trump’s June 2 executive order on AI innovation and security.
A New Government Review Framework in Practice
The release marks the first time a major AI lab has staged a frontier model rollout pending a federal review process. The June 2 executive order directed federal agencies to establish voluntary benchmarking and assessment procedures for frontier models before broad distribution. OpenAI shared the GPT-5.6 family and its release plans with the government ahead of launch; a 30-day deadline in the order — July 2 — pushed agencies to finalize interim guidance for exactly this kind of pre-release review.
Both OpenAI and Anthropic are reported to be developing repeatable frameworks with the White House and Department of Commerce for future releases, a pattern that could define how frontier models reach the public going forward.
Sol, Terra, and Luna — What Each Model Does
Sol, the flagship, targets demanding work: complex reasoning, extended coding sessions, agentic tasks, and cybersecurity applications. It introduces “max reasoning” — a mode for extended deliberation — and “ultra mode,” which deploys subagents for complex multi-step work. Terra is positioned as a mid-range option offering roughly GPT-5.5-level capability at half the cost. Luna optimizes for speed and high-volume affordability.
API pricing per million tokens: Sol at $5 input and $30 output; Terra at $2.50 input and $15 output; Luna at $1 input and $6 output.
Safety Before Launch
Before release, OpenAI spent more than 700,000 A100-equivalent GPU hours on automated safety testing and red-teaming, plus weeks of human red-teaming. The company reports that Sol does not cross the “Cyber Critical” threshold in its Preparedness Framework — the model surfaced vulnerabilities in testing but did not autonomously produce full exploit chains.
General availability is expected in the coming weeks.