GoKawiilOpenAI is introducing GPT-5.6, its next-generation model, two months after the release of GPT-5.5. However, the rollout to customers won’t be as straightforward as previous model updates to ChatGPT and Codex.
GPT-5.6 consists of three models
OpenAI’s new GPT-5.6 models include three versions, inspired by the Sun, Earth, and Moon. From today’s announcement:
Sol, our flagship model
Terra, a balanced model for everyday work
Luna, a fast and affordable model
OpenAI explains its thinking behind the new naming approach:
In this new naming system introduced with GPT‑5.6, the number identifies a model’s generation, while Sol, Terra, and Luna identify durable capability tiers that can advance on their own cadence. Together, the family gives people and developers clearer choices across intelligence, speed, and cost.
The company says it is “beginning a limited preview” of the GPT-5.6 series. The staggered release is due to corporation with the U.S. government:
We believe in broad access, and we plan to make GPT‑5.6 Sol, Terra, and Luna generally available in the coming weeks. As part of our ongoing engagement with the U.S. government, we previewed our plans and the models’ capabilities ahead of today’s launch. At their request, we are starting with a limited preview for a small group of trusted partners whose participation has been shared with the government, before releasing more broadly. During this preview, we will continue testing and coordinating closely with partners as we work toward broader availability.
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