GPT-6 Luna Release Date: Sept 22, 2026 — Rollout by Channel

model-release GPT-6 Luna Release Date: Out Sept 22, 2026 — OpenAI's Most Efficient Model, Rollout by Channel Jessie COO September 20, 2026 Updated on September 23, 2026 7 min read GPT-6 Luna was released on September 22, 2026. OpenAI calls it "our most efficient model for focused, high-volume tasks"