OpenAI’s GPT-5.6 family is now rolling out in GitHub Copilot. GPT-5.6 comes in three variants, Sol, Terra, and Luna, so you can match the model to the job, whether that’s reasoning over a large codebase, everyday agentic coding, or fast, cost-efficient assistance.
GPT-5.6 Sol: The highest reasoning ceiling in the family. Best for complex reasoning over large codebases and demanding, long-running agentic work.
GPT-5.6 Terra: The balanced default. A strong all-round choice for everyday interactive and agentic coding.
GPT-5.6 Luna: A lightweight, cost-efficient variant for smaller, faster tasks and also the lowest-cost option in the family.
These models are billed at provider list pricing under Usage Based Billing. See GitHub Copilot’s pricing for models and requests for details.
