OpenAI has expanded its GPT-6 family with two new models: GPT-6 Sol, a powerful workhorse for complex tasks, and GPT-6 Luna, a faster, cheaper variant built for scale and automation. Both are built on the GPT-6 Astra foundation but optimized for inference efficiency and lower cost. API pricing for Sol starts at $2 per million input tokens and $10 per million output tokens — 50% cheaper than GPT-5.6’s promo rates — and the models show notably better quality-to-cost ratios on AutomationBench. The lineup now covers the full range: Astra for maximum capability, Sol for serious daily work, and Luna for speed, scale, and low cost.

OpenAI introduces GPT-6 Sol and Luna

Related: OpenAI Launches GPT-6 Astra with Strong Benchmark Results, OpenAI Publishes Detailed API Guide for GPT-6 Astra