OpenAI has reduced prices for two GPT-5.6 models and introduced a faster processing option for its most capable model as the company seeks to make advanced AI workloads more economical at scale.
Starting July 30, GPT-5.6 Luna will cost 80% less while GPT-5.6 Terra will cost 20% less, according to an announcement from OpenAI. The company said the reductions reflect improvements across its models, inference infrastructure, production software, and context management systems.
Luna, the fastest and lowest cost model in the GPT-5.6 family, is now priced at $0.20 per million input tokens and $1.20 per million output tokens. Terra now costs $2 per million input tokens and $12 per million output tokens.
Pricing for GPT-5.6 Sol remains unchanged. The company also introduced Fast mode for Sol, replacing its previous Priority Processing service.
Fast mode can deliver up to 2.5× faster performance than Standard processing without changing the model’s intelligence, according to OpenAI. It costs twice the Standard processing rate, bringing Sol pricing under Fast mode to $10 per million input tokens and $60 per million output tokens.
