# OpenAI previews GPT-5.6 Sol, Terra and Luna, but locks the launch

> OpenAI previewed GPT-5.6 (Sol, Terra, Luna) on 26 June 2026 to ~20 government-approved partners only.

*The brief: OpenAI's new flagship trio is real, priced and gated to about 20 government-approved partners.*

By The FeaturedDaily Desk · FeaturedDaily
Canonical: https://featureddaily.com/news/gpt-5-6-preview-brief

> **Key:** OpenAI's most capable model family is here, but you probably can't use it yet: the GPT-5.6 preview is gated to roughly 20 government-approved partners.

## What happened

On 26 June 2026 OpenAI previewed **GPT-5.6** as three durable tiers. **Sol** is the top flagship for the hardest reasoning, coding, agentic and security work. **Terra** is the balanced everyday model, pitched at roughly GPT-5.5-level performance for about half the cost. **Luna** is the budget tier. Under the new naming, the number marks the generation and the names mark capability tiers that advance on their own cadence. An **"ultra" mode** splits work across multiple sub-agents, and Sol is due on Cerebras at up to 750 tokens/sec in July.

## The catch

At the **US government's request**, OpenAI started with a limited preview to about **20 trusted partners approved by the government**, reached via the **OpenAI API and Codex** — not in ChatGPT. It follows a **Trump executive order of 2 June 2026** directing agencies to benchmark new models and designate "covered frontier models" before wide release. OpenAI says it treats Sol, Terra and Luna as High capability in cybersecurity and biological/chemical under its Preparedness Framework, and that none reach High in AI self-improvement. It also says the gate **should not become the long-term default**, and expects to expand access in the coming weeks. This is the same federal machinery that paused Anthropic's Fable 5 and Mythos 5 in June — the access gate is now a pattern across labs, not a single-lab measure.

## The money

Pricing per 1M tokens, input/output:

| Tier | Role | Price in/out |
| --- | --- | --- |
| Sol | Top flagship | $5 / $30 |
| Terra | Balanced everyday | $2.50 / $15 |
| Luna | Budget | $1 / $6 |

> OpenAI says it "does not believe this kind of government access process should become the long-term default," arguing it keeps the best tools from users, developers, enterprises and cyber defenders who need them.
> — [OpenAI](https://openai.com/index/previewing-gpt-5-6-sol/), 2026-06-26

> The GPT-5.6 family is accessible only to a limited set of preview partners for now, at the US government's request, before wider availability.
> — [VentureBeat](https://venturebeat.com/technology/openai-unveils-gpt-5-6-sol-terra-and-luna-models-but-only-accessible-to-limited-preview-partners-for-now-per-us-gov), 2026-06-26

## Key takeaways

- OpenAI previewed GPT-5.6 on 26 June 2026 in three tiers: Sol (top), Terra (balanced), Luna (budget).
- At the US government's request, access was limited to about 20 approved partners via API and Codex, not ChatGPT.
- Pricing per 1M tokens runs from Sol at $5/$30 down to Luna at $1/$6.
- OpenAI says the government access process should not become the long-term default.

## FAQ

### What is GPT-5.6 Sol, Terra and Luna?
GPT-5.6 is OpenAI's model family previewed on 26 June 2026 in three tiers: Sol (top flagship for the hardest tasks), Terra (balanced everyday model at roughly GPT-5.5 performance for about half the cost) and Luna (budget tier).

### Why can't I use GPT-5.6 yet?
At the US government's request, OpenAI launched the preview only to about 20 government-approved partners via the API and Codex, not in ChatGPT. It expects to expand access in the coming weeks.

### How much does GPT-5.6 cost?
Per 1M tokens (input/output): Sol is $5/$30, Terra is $2.50/$15 and Luna is $1/$6.

### Why did the government gate the launch?
It follows a Trump executive order of 2 June 2026 directing agencies to benchmark new models and designate "covered frontier models" with advanced cyber capabilities before wide release.

## Sources

- [Previewing GPT-5.6 Sol: a next-generation model](https://openai.com/index/previewing-gpt-5-6-sol/) — OpenAI, 2026-06-26
- [OpenAI unveils GPT-5.6 Sol, Terra and Luna models — but only accessible to limited preview partners for now, per US Gov](https://venturebeat.com/technology/openai-unveils-gpt-5-6-sol-terra-and-luna-models-but-only-accessible-to-limited-preview-partners-for-now-per-us-gov) — VentureBeat, 2026-06-26
- [OpenAI releases powerful new GPT-5.6 model under restrictions](https://www.axios.com/2026/06/26/openai-gpt-sol-terra-luna-trump) — Axios, 2026-06-26