OpenAI launches GPT-6 Sol and Luna with lower-cost coding and agentic models

OpenAI unveiled GPT-6 Sol and GPT-6 Luna, extending its GPT-6 lineup with models aimed at coding, computer-use and agentic work at lower prices than prior Sol and Luna tiers. The company says the two models bring methods from GPT-6 Astra into faster, cheaper systems, with GPT-6 Luna costing 93% less per task than Claude Opus 5 in one DeepSWE coding comparison while scoring 66.6% at max effort.