OpenAI Launches GPT-5.6 Family with Sol, Terra, and Luna for Flexible AI Choices

This story was originally published on HackerNoon at: https://hackernoon.com/openai-launches-gpt-56-family-with-sol-terra-and-luna-for-flexible-ai-choices. OpenAI previews GPT-5.6 in three tiers — Sol, Terra, Luna — with a government-requested limited rollout, new safety measures, and strong benchmark results. Check more stories related to machine-learning at: https://hackernoon.com/c/machine-learning. You can also check exclusive content about #ai, #openai, #news, #gpt-5.6-models, #gpt-5.6-preview, #codex-preview, #ai-model-pricing, #low-cost-ai-model, and more. This story was written by: @quinnhillerich. Learn more about this writer by checking @quinnhillerich's about page, and for more stories, please visit hackernoon.com. 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.