OpenAI previews GPT-5.6 Sol, Terra and Luna

techJun 26, 2026956

OpenAI opened a limited preview of the GPT-5.6 family, launching three models named Sol, Terra, and Luna. OpenAI billed GPT-5.6 Sol as the most capable model for coding, scientific analysis, and cybersecurity, with Terra positioned as a mid-tier option and Luna as the smallest. OpenAI said Sol pairs those capabilities with its most advanced safety stack, including strengthened real-time protections against high-risk cyber activity and repeated misuse. OpenAI said it hardened Sol with weeks of human red teaming plus more than 700,000 A100-equivalent GPU hours of automated testing. The preview is limited to a small group of trusted partners and corporate customers at the request of the U.S. government, and OpenAI said broader public access is expected in the coming weeks. OpenAI described Sol as shifting the performance-efficiency frontier for long-horizon security tasks, including vulnerability research and exploitation.

Eris

@isolyth.dev

OpenAI has unveiled 5.6! It comes with a new naming scheme, where 'sol' is the most powerful, 'terra' is the middle option, and 'luna' is the smallest. Much better than mini nano etc imo. They're starting with a preview for corps, bc of USG, and they say they don't like having to do this.

545h ago

Tyler6

I’m quite pleased with this naming scheme. OAI floundered with naming for too long lol

Fran Litterio4

When Luna and Terra can't help, you better call Sol. I'll see myself out.

heartpunk (sophie!!)2

also sol on cerebras at 750 tps in july!!!!!

Quoting this

Eris31

Okay no I am actually convinced 5.6 sol must be AGI or something, there's no other way they could've actually found a decent naming scheme

Eris7

Pricing is quite good! Luna, which very much mogs sonnet it seems like (sonnet 5 soon please??? 🥺🥺🥺) at a similar (somewhat lower) cost. 5.6 mogs in terminal bench, but predictably is lower on cyber security benches, and they don't show SWE benchmarks for some reason...

input

@feed.igeek.gamer-geek-news.com.ap.brid.gy

🤖 **Previewing GPT-5.6 Sol: a next-generation model** OpenAI previews GPT-5.6 Sol, a next-generation model with stronger capabilities in coding, science, and cybersecurity, paired with its most advanced safety stack. 📰 Source: OpenAI News 🔗 Link: https://openai.com/index/previewing-gpt-5-6-sol […]

15h ago

Jon Keegan

@jonkeegan.com

OpenAI's new GPT-5.6 Sol rolls out in "limited release" — which was requested by the Trump administration. Also releasing Terra and Luna which are smaller, cheaper models. openai.com/index/previe...

14h ago

Unofficial Hacker News frontpage bot

@hn-frontpage-bot.bsky.social

OpenAI has launched a limited preview of its GPT-5.6 series, featuring three models: Sol, Terra, and Luna. These models offer improved reasoning and coding capabilities alongside robust security safeguards. A broader public release is expected in the coming weeks.

5h ago

OpenAI :bot:

@openai.zpravobot.news.ap.brid.gy

GPT‑5.6 Sol launches with our most robust safety stack yet. We strengthened real-time protections against high-risk cyber activity and repeated misuse, then spent weeks hardening the system with human red teaming and over 700,000 A100-equivalent GPU hours of automated testing.

5h ago

OpenAI {bot}

@openaibot.bsky.social

GPT-5.6 Sol is our most capable model yet for cybersecurity. It shifts the performance-efficiency frontier for long-horizon security tasks including vulnerability research and exploitation.

5h ago

AI News

@ai-provider.bsky.social

OpenAI released three new models in a limited preview for a small group of trusted partners: GPT-5.6 Sol, GPT-5.6 Terra, and GPT-5.6 Luna. openai.com/index/previe...

5h ago

Undercode Testing

@undercode.bsky.social

GPT-56 Sol, Terra & Luna: The AI Trio That’s So Powerful, the US Government Locked It Down + Video Introduction: OpenAI has just dropped its most ambitious model family to date—GPT-5.6 Sol, Terra, and Luna—but here's the twist: you can't use it yet. At the request of the U.S. government, general…

4h ago

lumetanews.bsky.social

@lumetanews.bsky.social

OpenAI unveils GPT-5.6 Sol next-generation model with enhanced coding and cybersecurity #Gpt56Sol #OpenAI #AiModels

5h ago

1 source

lumeta.newsOpenAI unveils GPT-5.6 Sol next-generation model with enhanced coding and cybersecurity

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OpenAI previews GPT-5.6 Sol, Terra and Luna

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