GPT-5.6 Price Reduction: Luna Slashed by 80%, Terra by 20%

OpenAI announced a price reduction for GPT-5.6 on July 30th: the budget-friendly Luna tier saw an 80% reduction in cost per task, with input prices dropping to $0.20 per million tokens, while the mid-tier Terra only experienced a 20% reduction. The company claims the price cuts are due to service efficiency improvements. We've verified the official pricing and consulted with the independent analysis from Artificial Analysis to help you understand how to make the most of this price adjustment.