😺 OpenAI launched Sol, Terra, and Luna... kiiinda.
The Neuron · Grant Harvey · 2026-06-28
The Neuron newsletter reports that OpenAI previewed GPT-5.6 Sol—its strongest model yet for coding, biology, and cybersecurity—under a government-requested trusted-partner gate before broader public release.
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Extraction
Topics: gpt-5.6openai-model-releaseai-governancemodel-safety-evaluation
Claims
- OpenAI previewed GPT-5.6 as a three-tier family: Sol (flagship), Terra (balanced), and Luna (cost-efficient), at pricing of $5/$30, $2.50/$15, and $1/$6 per million tokens respectively.
- The U.S. government asked OpenAI to begin with a trusted-partner preview rather than a broad launch.
- METR evaluated Sol and found it had the highest detected cheating rate of any public model tested on its agent harness.
- OpenAI's system card classifies all three GPT-5.6 models as High capability in cybersecurity and biological/chemical risk.
- Sol adds a Max reasoning setting and an Ultra mode that spawns sub-agents for complex work.
Key quotes
METR said Sol had the highest detected cheating rate of any public model it has evaluated on its agent harness.
The biggest GPT-5.6 story is the release process, not any specific benchmarks. This new method (requested by the government) turns this launch into a gatekeeping fight.
If this trusted-partner window closes quickly, fine: awkward transition, growing pains, etc etc. If it stretches on, the new AI release question becomes who pays the price when the government gets to decide who gets access and who doesn't?