OpenAI previews GPT-5.6 Sol, Terra and Luna

techJun 26, 2026962

OpenAI has launched a limited preview of a GPT-5.6 family comprising Sol, Terra, and Luna, with Sol positioned as the most capable model for coding, scientific analysis, and cybersecurity. Sol pairs upgraded reasoning and coding performance with what OpenAI calls its most advanced safety stack, including strengthened real-time protections against high-risk cyber activity, weeks of human red teaming, and more than 700,000 A100-equivalent GPU hours of automated testing. Terra is presented as the mid-tier option and Luna as the smallest, reflecting a new naming scheme replacing labels like mini and nano. The preview is restricted to a small group of trusted partners and enterprise customers, reportedly at the request of the U.S. government. OpenAI says broader public availability is expected in the coming weeks.

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.

6045d ago

Tyler6

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

Fran Litterio5

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

heartpunk (sophie!!)3

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

Scooty1

The real reason why Sol left the Villa

Quoting this

Eris45

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

Eris8

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 […]

145d 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...

145d 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.

45d 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.

45d 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.

45d 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...

45d 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…

45d ago

lumetanews.bsky.social

@lumetanews.bsky.social

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

45d 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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