OpenAI launches GPT-6 Sol and Luna

OpenAI announced GPT-6 Sol and GPT-6 Luna on September 22, 2026. Sol is priced at $2 input / $10 output; Luna at $0.10 / $0.50. Both are available in ChatGPT Work and Codex for Plus, Pro, Business and Enterprise, with Free and Go limited to Luna on desktop. OpenAI says both use GPT-6 Astra training methods.