GPT-5.6 Luna

GPT-5.6 Luna is OpenAI's smallest, fastest, and most cost-efficient model in the GPT-5.6 family, designed for high-volume, cost-sensitive workloads such as classification, extraction, chat, and lightweight agent workflows. It offers a 1,050,000-token context window and 128,000 max output tokens, positioned as the throughput-optimized tier below Terra (balanced) and Sol (flagship). Source: supabase.