OpenAI’s rapid September 2026 cadence anchors trader sentiment on the next GPT Sol (6.2+) release. After launching flagship GPT-6 Astra in early September, the company shipped GPT-6 Sol and Luna on September 22 as efficient large language model variants optimized for coding, agentic workflows, and professional tasks at roughly half the token cost of GPT-5.6 predecessors, followed by GPT-6.1 Sol on September 29 with further gains on computer-use benchmarks. An October 7–8 rollout extended Sol to ChatGPT users alongside an Intelligent UI feature. Competitive releases from Anthropic’s Claude Opus 5.5 and Google’s Gemini 4 Argon have not targeted the Sol naming or pricing tier. Key upcoming catalysts include OpenAI’s internal safety reviews, historical 75-day release gaps, and any efficiency or alignment updates that could accelerate or delay a 6.2 iteration.