Who can access GPT-5.6 Sol during the preview?

Initially, only a small group of trusted partners, whose participation has been shared with the U.S. government, can access the model.

What are the models in the GPT-5.6 series?

The GPT-5.6 series includes Sol (flagship), Terra (balanced for everyday work), and Luna (fast and affordable). Terra is 2x cheaper than GPT-5.5 with competitive performance.

Large Language ModelsAI Business & IndustryOpenAI BlogJun 26, 2026Jun 27, 2026, 04:00 JST

OpenAI previews GPT-5.6 Sol with limited release

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3 Key Points

What happened
OpenAI has begun a limited preview of GPT-5.6 Sol, its flagship model, along with Terra and Luna. The preview is initially available to a small group of trusted partners, with broader availability planned in the coming weeks.
Why it matters
GPT-5.6 Sol is described as OpenAI's strongest model yet, with improvements in coding, biology, and cybersecurity. It is also paired with a more robust safety stack, including strengthened protections for higher-risk activity and sensitive cyber requests. The company says this government-coordinated release is a short-term step to enable broader availability soon.
What to watch
The broader rollout of GPT-5.6 Sol, Terra, and Luna hinges on the success of the limited preview and ongoing coordination with partners. Watch for the expanded suite of evaluation results when the model becomes broadly available.

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Context & Analysis

The preview of GPT-5.6 Sol marks OpenAI's latest step in releasing more capable models while navigating government engagement. The company explicitly states that the limited preview is a short-term measure, requested by the U.S. government, to ensure safety before broader availability. This reflects a balance between broad access and security concerns, especially given the model's enhanced cyber capabilities.

OpenAI emphasizes that Sol is its strongest model yet, with performance improvements in coding, biology, and cybersecurity. The company highlights a new safety stack and automated red-teaming as key safeguards. However, the long-term process for future releases is still being shaped, with an executive order framework under development.

The outcome hinges on the success of the limited preview and the coordination with partners. If the preview goes well, broader availability could follow soon, but the company warns that such government access should not become the default. The coming weeks will be critical to see if OpenAI can balance safety with its goal of broad access.

FAQ

Who can access GPT-5.6 Sol during the preview?: Initially, only a small group of trusted partners, whose participation has been shared with the U.S. government, can access the model.
What are the models in the GPT-5.6 series?: The GPT-5.6 series includes Sol (flagship), Terra (balanced for everyday work), and Luna (fast and affordable). Terra is 2x cheaper than GPT-5.5 with competitive performance.

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