The three sisters, finally set free. "Show the government first" โ then, the world.
Meet Chappy (OpenAI)'s new generation, GPT-5.6 โ a trio of sisters: Sol-chan, Terra-chan, and Luna-chan. Held back by a U.S. government review, the newest models were finally released to all users on July 9, 2026. Here's a gentle recap of everything that happened this week.
First, the manga version of the big release
Before diving in, get the whole picture in a single page. From the sisters' debut, through the government review, all the way to their worldwide release โ it's all here.
So what's actually new about GPT-5.6?
The biggest change is how the models are named. Until now you picked by number alone; from GPT-5.6 on, the number marks the "generation" and Sol / Terra / Luna mark the "capability tier".
๐ข Pick by number
- Choose by a single number like "GPT-5.5 / 5.2"
- The only yardstick: "newer number = stronger"
- New model means all the names get replaced
๐ญ Pick by generation + role
- Choose by generation (5.6) + role (Sol/Terra/Luna)
- Pick the mix of smarts, speed, and price for the job
- The Sol/Terra/Luna role names stay fixed forever
How the three sisters split the work
Sol-chan, Terra-chan, and Luna-chan are sisters lined up from most to least powerful. You choose "which sister to ask" based on the job.
Sol-chan (Sol)
The flagship. The smartest of the three โ the top-tier brain. Hand her the hard problems.
Terra-chan (Terra)
The everyday all-rounder. For most daily work, she's all you need.
Luna-chan (Luna)
Fast and affordable. She breezes through light tasks and bulk jobs in no time.
Why were they held back?
GPT-5.6 had actually existed for a little while already. It just wasn't something everyone could use.
The review focused on cyberattack capabilities
As of late June, at the U.S. government's request, access was a limited preview for only about 20 "trusted companies". The review zeroed in on cyberattack-related capabilities โ especially those of the eldest sister, Sol-chan. In short, the government was making sure it was safe to let such a powerful girl loose on the whole world at once.
The road to release day
From limited preview to worldwide launch โ the past two weeks in order.
June 26: Limited preview
Early access for only about 20 government-approved companies. Closed to the public.
June 27: School Newspaper report
We reported that the sisters were in a "government-gets-a-look-first" limited release โ the same "shadow of the government" that hung over Kuroko after her unsealing.
July 8: The announcement
OpenAI announced: "Public launch tomorrow, July 9 โ and the preview goes worldwide too."
July 9: Public launch
Sol-chan, Terra-chan, and Luna-chan open up to all users. Right on schedule.
Kuroko took a very different path
That same week, Kuroko (Anthropic) was also stuck in the "held back" club. But the way she came back was the exact opposite.
๐ป Straight back to everyone
- On July 1, she strapped on new safety gear herself and reopened
- Fable 5 resumed + Sonnet 5 made the new default
- The "gear up on your own and push through" approach
๐ค In step with the government
- "Wait for the government review, then launch" (July 9)
- On July 2, reports said OpenAI offered the government a 5% equity stake
- The "move in step with the government" approach
A week in which the two houses' relationships with the government split sharply apart.
The hold is lifted, and the three sisters are out in the world at last.
A top-class model reaching the public only after passing a government review โ not a competitor's โ quietly shows that AI is no longer the business of a single company. The next question: how will Sol-chan, Terra-chan, and Luna-chan pull ahead of their rivals in real-world use? The School Newspaper will keep following the story.