OpenAI has started a limited preview of its GPT-5.6 series, introducing three distinct models named Sol, Terra, and Luna. Sol serves as the flagship option, while Terra offers performance comparable to GPT-5.5 at half the cost. Luna provides strong capabilities at the lowest price point within the new line. The company confirmed these names and specifications via a blog post, noting that Terra balances everyday work needs with significant savings. Luna targets users requiring affordability without sacrificing core functionality. This rollout follows discussions with the U.S. government regarding the models’ capabilities. Consequently, access is currently restricted to a small group of trusted partners whose participation has been shared with regulators. Broader availability is scheduled for the coming weeks once this initial phase concludes.
The strategy signals a shift toward tiered pricing structures that explicitly separate high-performance tasks from cost-sensitive applications. By naming the models Sol, Terra, and Luna, OpenAI creates clear distinctions for enterprise buyers and developers. This approach allows organisations to select specific models based on budget constraints rather than relying on a single general-purpose engine. The involvement of the U.S. government in approving the preview list adds a layer of regulatory oversight to the launch process. These details indicate a more structured approach to model distribution compared to previous releases.
- Sol is the flagship model for demanding workloads
- Terra matches GPT-5.5 performance at half the price
- Luna offers strong capability at the lowest cost
