OpenAI Previews Its Next-Gen GPT-5.6: Sol, Terra, and Luna
OpenAI has announced its next-generation GPT-5.6 series in a limited preview: flagship Sol, the balanced Terra for everyday work, and the fast, affordable Luna. In the new naming, the number marks the generation while the names mark durable capability tiers — intelligence, speed, and cost.
In brief
- Three tiers: Sol is the flagship; Terra matches GPT-5.5 performance at 2x cheaper; Luna is strong at the lowest cost. Pricing (per 1M tokens): Sol $5/$30, Terra $2.50/$15, Luna $1/$6.
- New modes: a "max reasoning" effort for deeper thinking, and an ultra mode that goes beyond a single agent by using subagents to speed up complex work.
- Capability: a new state of the art on Terminal-Bench 2.1 for coding; on GeneBench it beats GPT-5.5 in biology using fewer tokens; it's OpenAI's most capable model yet for cybersecurity.
- Phased launch: because of the jump in cyber capability, it starts with trusted partners only; OpenAI previewed its plans to the U.S. government and is starting narrow at their request — with broad access on ChatGPT/Codex/API to follow soon.
Our take
The real story is as much how it's shipping as the model itself. Citing the leap in cyber capability, OpenAI previewed GPT-5.6 to the U.S. government and is opening it through a narrow preview first — while explicitly saying this kind of government-access process shouldn't become the long-term norm. A frontier model is no longer just a product; as capability grows, so do its access controls, safety layers, and coordination with the state. The Sol/Terra/Luna split, meanwhile, is simple but meaningful: a clear choice between intelligence, speed, and cost.
Kaynak: OpenAI