OpenAI slashes GPT-5.6 Luna price by 80%, Terra by 20%

Published Jul 30, 10:00 AM UTC

OpenAI announced significant price reductions for its GPT-5.6 model family, effective immediately. GPT-5.6 Luna, the fastest and most affordable model, is now 80% cheaper, while GPT-5.6 Terra, the balanced everyday model, is 20% cheaper. The new pricing also affects usage counting for Codex and ChatGPT Work subscriptions. OpenAI introduced Fast mode in the API, replacing Priority Processing, offering up to 2.5x faster speeds for GPT-5.6 Sol at double the standard price. The company highlighted efficiency gains from improvements in model architecture, inference systems, and agentic harnesses. Testimonials from partners including Replit, Notion, Ramp, Blitzy, Cognition, and Dust praised Luna and Terra for cost savings, speed improvements, and enabling new agentic workflows. OpenAI framed the price cuts as part of its mission to make advanced intelligence more abundant and affordable.