OpenAI launches GPT-6 Sol + Luna: Astra intelligence moves down the cost curve

OpenAI has launched GPT-6 Sol and GPT-6 Luna, making Astra's advancements in coding, factuality, computer use, and agentic work available in faster, cheaper models. These models are live in ChatGPT Work, Codex, and the API as gpt-6-sol and gpt-6-luna. Sol is priced at $2/M input + $10/M output, and Luna at $0.10/M + $0.50/M, both approximately 50% below GPT-5.6 promotional pricing. A key feature is improved prompt caching, offering 90% cheaper cached reads and higher hit rates.