GPT-5.6 Sol, Terra, Luna: OpenAI's New AI Models Revealed

OpenAI has launched GPT-5.6 Sol, its newest flagship AI model, alongside two other models, Terra and Luna. Sol is designed for tasks requiring deeper reasoning, long-term planning, and technical expertise, performing better in areas like software development and scientific research. It features a "max" reasoning mode and an "ultra" mode for complex problem-solving. Terra is a balanced model for everyday professional work, while Luna is the fastest and most affordable for applications where speed and cost are key. This three-tier strategy offers different AI models for different user needs. However, access to GPT-5.6 is currently limited to a small group of trusted partners, working closely with the US government. Broader availability for ChatGPT users and developers is expected in the coming weeks. This restricted rollout highlights growing regulatory scrutiny over how powerful AI models are deployed.