How GPT-5.6 fuses frontier intelligence with frontier efficiency

GPT-5.6 is a new family of AI models designed to balance intelligence with efficiency, offering different versions at various price points (Sol, Terra, and Luna). The company optimized performance across multiple layers of their system, including inference (the process of running models to generate output), load balancing (distributing requests across servers), caching (reusing previously computed work), and their agentic harness (the framework that manages how models work together).