OpenAI announced today the release of its new GPT-5.6 series models, including the flagship Sol, the balanced everyday office model Terra, and the speed- and cost-focused Luna, all available for testing by select partners in a 'limited preview' format. Among them, Terra's overall performance is close to that of GPT-5.5, with its price reduced by approximately half; Luna offers 'robust capabilities' at the lowest price, targeting cost-sensitive enterprises and developers who still require mid-to-high-level large model capabilities.
