India, July 27 -- OpenAI's rollout of the GPT-5.6 family introduces a major shift not just in performance, but in how the company categorizes its models. Moving away from the confusing naming conventions of the past, OpenAI has introduced a dual-naming framework: "5.6" represents the current technical generation, while Sol, Terra, and Luna act as durable capability tiers that will persist in future generations.

While Sol delivers the highest level of reasoning and accuracy, Terra and Luna are engineered to complete everyday workflows faster and at a lower cost. Choosing the right tier is critical for developers managing API costs and organizations scaling AI operations.

Here is a complete breakdown of GPT-5.6 Sol, Terra, and Luna, what ...