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OpenAI previews GPT-5.6 in three tiers — Sol, Terra, Luna — with a government-requested limited rollout, new safety measures, and strong benchmark results.
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OpenAI is previewing GPT-5.6 in three tiers — Sol (flagship), Terra (balanced, 2x cheaper than GPT-5.5), and Luna (lowest-cost) — starting with a limited rollout to trusted partners via Codex and the API, at the request of the U.S. government. Broader ChatGPT/Codex/API access follows in the coming weeks. The launch pairs OpenAI’s most robust safety stack to date (strengthened cyber/misuse protections, real-time classifiers, 700,000+ GPU hours of red-teaming) with strong benchmark results: Sol tops Terminal-Bench 2.1 and GeneBench v1, all three models show gains on ExploitGym, and Sol stays under the Cyber Critical threshold.