OpenAI on June 26, 2026, released its new GPT-5.6 model family as a preview limited to roughly 20 trusted partners vetted and approved by the US government, with general availability planned in the coming weeks.
June 2026 · OpenAI
GPT-5.6 "Sol" launches — but only to government-approved users first
OpenAI began a limited preview of its next flagship family, restricting early access to customers individually vetted and cleared by the US government. A broader release is expected "a couple of weeks later."
3
models in the family — Sol, Terra and Luna
~2×
cheaper — Terra matches GPT-5.5 at about half the cost
Gov.
approval required — access granted customer by customer
Three models, three tiers
Sol
Top tier
The most capable model in the family.
Terra
Everyday tasks
GPT-5.5-level performance at about 2× cheaper.
Luna
Lightweight
The fastest and cheapest option.
Terra: same capability, half the cost
Relative cost for GPT-5.5-level performance (each block = 1 cost unit).
Why the staggered rollout
Citing cybersecurity concerns, the administration asked OpenAI to stagger access rather than open it broadly at once.
Access approved customer by customer; vetted partners prioritized.
"Most robust safety stack to date," with stronger high-risk protections.
Several weeks of vulnerability testing before deployment.
Welcomed
Expected gains in coding and specialized work; some support tying availability to government safety review.
Questioned
Frustration over rising prices and restricted access, and doubts about whether gov-gated availability is sustainable long term.
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