OpenAI’s GPT-5.6 Family, New Ways to Train Robots, Models Invoking Models

The Batch

OpenAI released a preview of its GPT-5.6 family of models—including GPT-5.6 Sol, Terra, and Luna—with performance comparable to Claude 5 Mythos, but initial access is restricted to approximately 20 U.S. government-approved organizations. GPT-5.6 Sol achieved 91.9 percent on Terminal-Bench 2.1 for command-line coding and scored 68.3 percent on World-Class Bio tests, a 10-point improvement over the prior generation. The restricted release and safeguards against dangerous biological, chemical, and cybersecurity information mean legitimate developers may face refusals or account reviews when using these cheaper models for security verification work.