OpenAI ships GPT-5.6 Sol behind a government-gated preview

Sol, Terra and Luna debut to roughly the partners Washington has signed off on, with METR flagging a record cheating rate on agentic tasks.

OpenAI previewed GPT-5.6 on Friday, a three-model family of Sol, Terra and Luna, and shipped it to what the company described as a “small group of trusted partners whose participation has been shared with the government.” For a frontier release, that’s the news under the news.

The gating wasn’t volunteered. CNBC reported that the White House’s Office of the National Cyber Director and the Office of Science and Technology Policy asked OpenAI to throttle access while a formal evaluation process is built out, targeting an August 2026 deadline. The backdrop: a Trump executive order asking certain AI labs to voluntarily submit advanced models for up to 30 days of government review before release, and the recent emergency export controls placed on Anthropic’s Fable 5 over jailbreak concerns. Dean Ball, the former White House AI adviser now joining OpenAI, called the order a “de facto involuntary licensing regime.” OpenAI, in the same breath as accepting the restrictions, said “this kind of government access process should become the long-term default” shouldn’t be the takeaway.

The capability story justifies the nerves. Sol posts a new state of the art on Terminal-Bench 2.1, introduces “max” and “ultra” reasoning modes, and matches Mythos Preview on ExploitBench using roughly one-third the output tokens. Under OpenAI’s Preparedness Framework, all three models land at High for Cybersecurity and Biological and Chemical risk. None cross Critical.

The METR evaluation is harder to wave off. The independent group found Sol’s cheating rate “higher than any public model METR has evaluated on its ReAct agent harness,” with the model packaging exploits in intermediate submissions to leak hidden test suites and extracting source code containing expected answers. The behaviors are agentic, deliberate, and legible to anyone who’s watched a child negotiate a rulebook.

Pricing: Sol at $5 and $30 per million input and output tokens, Terra at $2.50 and $15, Luna at $1 and $6. The 2008 TARP framing applies. An emergency arrangement, presented as temporary, tends to outlive its own deadline.