OpenAI Launches GPT-6 Sol and Luna with 50% Price Reduction

On September 22, 2026, OpenAI introduced the GPT-6 Sol and Luna models, reducing prices by 50% compared to their predecessors, GPT-5.6 Sol and Luna. The input price for GPT-6 Sol is set at $2 per million tokens, while output costs are $10 per million tokens. For GPT-6 Luna, input costs are $0.10 and output costs are $0.50 per million tokens.

GPT-6 Sol is designed for complex tasks such as feature development, code review, debugging, and data analysis, while GPT-6 Luna focuses on efficiently handling large volumes of well-defined tasks. Despite the cost reduction, performance metrics indicate that GPT-6 Sol achieved a score of 68.8% on the DeepSWE v1.1 benchmark at maximum effort, slightly lower than the 72.7% score of GPT-5.6 Sol at a cost of $6.46 per task. In comparison, Claude Opus 5 scored 69.9% at