OpenAI Slashes GPT-5.6 Luna Prices by 80%

OpenAI is cutting prices on two models in its GPT-5.6 frontier series, reducing Luna by 80% and Terra by 20%, while adding a premium Fast mode for its flagship Sol model. Luna will now cost $0.20 per million input tokens and $1.20 per million output tokens. The cuts come days after Anthropic held Claude Opus 5 pricing steady and Google launched two cost-focused Gemini models. OpenAI aims to undercut Google on price per intelligence and attract Anthropic users with faster performance.