OpenAI has released GPT-6 Sol and GPT-6 Luna, new models delivering near-GPT-6 Astra performance in professional tasks, coding, and computer use at significantly reduced costs. API input and output prices for both models are 50% lower than GPT-5.6 promotional pricing, achieved through improved caching and inference infrastructure without compromising performance. The new models are now available via the OpenAI API under "gpt-6-sol" and "gpt-6-luna." Rollout is expanding to ChatGPT Work and Codex users, while GPT-6 Luna is also accessible to desktop Free and Go tier users.