OpenAI Splits GPT-5.6 Into Sol, Terra, and Luna, Standardizing a Million-Token Context Window and Agent Tool Interface
The GPT-5.6 family is now generally available, with Sol, Terra, and Luna covering maximum capability, balanced cost, and high-volume, low-cost workloads, respectively. All three models share a long-context architecture and tool interface, but their inference costs, safety behavior, and real-world quality still require separate evaluation.