OpenAI cuts GPT-5.6 Luna prices by 80% after model-led self-optimization

GPT-5.6 Luna now costs $0.20 per million input tokens and $1.20 per million output tokens, while GPT-5.6 Terra received a 20% price reduction. OpenAI achieved these savings by using GPT-5.6 Sol to autonomously rewrite production kernels and optimize inference infrastructure.