GPT-6 Luna (Global)

GPT-6 Luna joins the GPT-6 family as an efficiency-oriented sibling released alongside GPT-6 Sol, sitting below GPT-6 Astra in the lineup. According to Microsoft Foundry coverage of the launch, Luna is designed to bring efficient intelligence to high-volume data and preparatory work, complementing Astra's advanced reasoning, software engineering, and computer-use strengths and Sol's general-purpose capabilities. Aggregator reporting on the same day described the model as positioned for production agents, with API pricing reported at roughly half of GPT-5.6 promotional rates, reflecting a focus on cost-effective throughput for tasks that do not require Astra's full reasoning depth.

As a member of the GPT-6 series, Luna carries the same production-agent framing that Microsoft Foundry applied to its GPT-6 lineup, emphasizing task completion with reduced noise compared with earlier generations. The fit is for preparatory pipelines, batch summarization, classification, and other high-volume language workloads where efficiency outweighs the need for Astra-level reasoning, while still benefiting from the broader GPT-6 quality improvements that the series is built on.