# OpenAI Launches Latest GPT-5.6 Large Language Model Series

- Category: Flash (快讯)
- Published: 2026-06-29T12:00:00.000Z
- Source date: 2026-06-29
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OpenAI has released a limited preview of the GPT-5.6 series, featuring Sol, Terra, and Luna models. Sol enhances professional capabilities with new deep reasoning and multi-agent modes; Terra offers equivalent performance at half the price; Luna focuses on being lightweight and fast. Due to US government requirements, the series shifted from planned open access to a limited preview.

## At a glance

- The GPT-5.6 series includes Sol, Terra, and Luna models, focusing on professional capabilities, cost-performance, and lightweight speed respectively.
- Due to US government requirements, the GPT-5.6 series, originally planned for open access, is released as a limited preview.

## The update

OpenAI has officially launched the limited preview of the GPT-5.6 large language model series, which includes three models: the flagship Sol, the balanced Terra, and the cost-effective Luna. The Sol model excels in professional fields such as programming, cybersecurity, and biology, adding max deep reasoning capabilities and an ultra multi-agent collaboration mode. The Terra model aims to provide a balanced option, delivering equivalent performance at half the price of GPT-5.5. The Luna model focuses on being lightweight and high-speed. Notably, while the series was originally planned for open public access, it was adjusted to a limited preview release in response to US government requirements. This change reflects the impact of the current policy environment on the deployment of advanced AI models, with users currently able to experience these latest models only through specific channels.

## Sources

- [机器之心](https://mp.weixin.qq.com/s/zHA3FpSLLVksg9ze9Ybg_g) (2026-06-29)

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