OpenAI cuts GPT-5.6 Luna prices by 80 percent and Terra by 20 percent

OpenAI reduced API pricing for GPT-5.6 Luna by 80 percent to 0.20 dollars per million input tokens and 1.20 dollars per million output tokens, and for Terra by 20 percent, while leaving Sol pricing unchanged and introducing Fast mode for up to 2.5 times faster speeds. The changes, enabled by efficiency gains in model serving and agentic systems, make high-volume enterprise workloads more economical and expand practical deployment of capable models. This directly addresses rising enterprise cost scrutiny amid competition from lower-priced Chinese models.