OpenAI Previews GPT-5.6 With Sol, Terra, and Luna: Tiered Models, New Reasoning Modes, Limited Access
OpenAI has begun a limited preview of GPT-5.6, its next-generation model series. The lineup splits into three named tiers: Sol, Terra, and Luna. Sol is the flagship. Terra targets everyday production work. Luna is the fast, low-cost option. OpenAI is starting with a small group of trusted partners through the API and Codex. According to OpenAI post, they shared the models and plans with the U.S. government first. Broader access in ChatGPT, Codex, and the API is planned in the coming weeks.
OpenAI has begun a limited preview of its next-generation model series, which is organized as a three-tier family split into named tiers targeting different use cases: a flagship tier for complex work, a mid-tier matching previous performance at lower cost, and a fast, low-cost option. The new release introduces two reasoning modes, one that allows deeper single-chain reasoning and another that coordinates multiple subagents to split complex work, plus a heavier safety layer. The models are priced per million tokens with the mid-tier roughly half the cost of the previous generation, and broader access through various platforms is planned in the coming weeks.
Explainer: What Is GPT-5.6? OpenAI's Newest Model Family, Explained
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