OpenAI maintains exclusive control over the GPT branding and Sol naming tier for its frontier large language models, driving market consensus around its internal roadmap. The company released GPT-6 Astra in early September 2026, followed by GPT-6 Sol and Luna on September 22 at lower token prices than prior GPT-5.6 variants, then GPT-6.1 Sol on September 29 during DevDay with near-Astra coding and agentic performance at roughly one-fifth the cost. This accelerated cadence, supported by ongoing safety evaluations and competitive positioning against models from Anthropic and Google, reflects OpenAI’s focus on iterative upgrades to coding, computer use, and professional workflows. Traders monitor upcoming DevDay follow-ups and any regulatory or safety-related delays for signals on 6.2+ Sol timelines.