OpenAI launches GPT-6 Sol and Luna with lower-cost frontier models for coding and agents

OpenAI expanded its GPT-6 lineup on September 22 with GPT-6 Sol and GPT-6 Luna, positioning the new models as cheaper, faster options for coding, computer-use agents and high-volume workflows. The company said the models bring techniques used for GPT-6 Astra into lower-priced tiers while keeping Astra as its strongest model for the most demanding work.