NEW YORK, June 28 — $0. That is the price increase for OpenAI’s flagship GPT-5.6 model, Sol. It costs the same as its predecessor, GPT-5.5.
The bottom line: more capable AI at no extra cost, at least for the top tier. OpenAI unveiled the GPT-5.6 series today, introducing three distinct capability tiers: Sol, the flagship; Terra, the mid-tier; and Luna, the hyper-fast model.
The company described Sol as smart, efficient, and a significant step forward. Terra delivers performance comparable to GPT-5.5 but at half the price. Luna’s pricing was not detailed in the release.
But here is the catch. Rather than a wide public rollout, OpenAI is launching the series in a tightly restricted “limited preview.” That decision came at the request of the US government, following high-profile national security scrutiny.
The Trump administration previously used export controls to render rival models offline, later allowing them with conditions. OpenAI is now working alongside Washington ahead of an upcoming White House cyber Executive Order. CEO Sam Altman delivered the news directly.
“Good news first: Sol is a smart, efficient, and a significant step forward. It is the same price as GPT-5.5. Also launching in the GPT-5.6 family is Terra, with 5.5-level performance at half the price.” Then the bad news: “at the request of the US government, it is launching today in limited preview instead of the open access launch we were planning on.
We are working with the government to get to general availability as fast as we can.” Altman framed the restricted rollout as consistent with company strategy. “I think it is quite reasonable to roll out models—especially as they reach significant new levels of capability—in this way.
It fits with our long-held strategy of iterative deployment. But this isn’t quite the process that we think is optimal.” He added that OpenAI will work with the government to attempt to get to a transparent, reliable process for early access. Investors will note the competitive pressure behind this launch.
OpenAI is moving closer to countering intense competitive pressure and stringent regulatory scrutiny. The company warned that heavy government intervention should not become the industry’s permanent default.
That tension — between rapid deployment and national security controls — defines the current moment for frontier AI. The figure that matters for now: Sol, the most capable model, costs the same as GPT-5.5. Terra undercuts that by half.
Luna, the hyper-fast option, rounds out the family. But access is the real variable. Limited preview means the technology exists but is not widely available.
OpenAI is betting that working with the Trump administration will speed that up. What to watch next: how quickly OpenAI moves from limited preview to general availability, and whether the White House cyber Executive Order creates a repeatable framework for early access.
Altman said the company will attempt to get to a transparent, reliable process. That process is not here yet. For now, the GPT-5.6 series exists, it is priced competitively, and it is locked behind government-mandated gates.
