OpenAI’s rapid expansion of its GPT-6 family has shaped trader sentiment around the next Luna (6.1+) release. The company launched GPT-6 Sol and Luna on September 22, 2026, delivering 50% lower API pricing than GPT-5.6 predecessors, improved alignment, and stronger performance on coding and agentic tasks while rolling them out to ChatGPT Work, Codex, and the API. A follow-on GPT-6.1 Sol arrived September 29, and October 7–8 brought GPT-6 Luna to broader ChatGPT users alongside the new Intelligent UI feature. These moves, coming weeks after GPT-6 Astra, highlight OpenAI’s aggressive cadence and cost-efficiency gains relative to competitors like Anthropic’s Claude models. Key near-term catalysts include further ChatGPT rollouts, benchmark updates, and any signals on subsequent versions or partnerships that could shift market-implied odds.