GPT-6 Luna (Azure)

GPT-6 Luna is an OpenAI-developed model in the GPT-6 series that is being served directly through Microsoft Azure, reaching general availability in Microsoft Foundry on September 22, 2026 alongside the newly added GPT-6 Sol and the already available GPT-6 Astra. The OhMyGPT model page describes it as OpenAI's efficient GPT-6 variant, succeeding GPT-5.6 Luna and built for high-volume workloads such as extraction, summarization, and request routing, with Microsoft positioning the broader lineup as more capable of completing full tasks with production agents in Foundry.

Within that lineup, Luna is framed as the efficiency-oriented member, complementing Astra's advanced reasoning and software engineering strengths and Sol's general-purpose profile, so it is best suited to preparatory and high-throughput data tasks that feed into agent pipelines. The OhMyGPT listing tags it as supporting tool invocation and reasoning, and it ships through Azure with no built-in filtering applied on that gateway, while the official Azure announcement ties it to the Foundry production-agents agenda rather than frontier reasoning benchmarks.