OpenAI continues to drive the GPT-6 family forward with rapid iterations on its Sol models, the tier positioned for complex coding, agentic workflows, and professional tasks at lower cost than the flagship Astra. After launching GPT-6 Astra in early September 2026, the company released GPT-6 Sol and Luna on September 22 with 50% lower API pricing than GPT-5.6 equivalents, followed by GPT-6.1 Sol on September 29 offering near-Astra performance at roughly one-fifth the price. These updates emphasize improved factuality, efficiency via better caching, and competitive benchmarks against rivals like Anthropic’s Claude models. Traders are watching for further Sol-line advancements or DevDay announcements, as OpenAI’s internal cadence and safety-focused releases remain the dominant factor shaping expectations for any 6.2+ version.