GPT-5.6 Sol vs Terra vs Luna: Full Comparison (July 2026)

GPT-5.6 GA July 9, 2026. Pricing approximately $4/$24 (Sol), $2/$12 (Terra), $0.80/$4.80 (Luna) per million input/output tokens. ChatGPT Work and Codex offer broadest model access; standard ChatGPT chat exposes Sol on eligible paid plans. 1.05M context across family. ChatGPT Work represents OpenAI’s shift from conversational AI to delegated project execution.