OpenAI’s September 22 launch of GPT-6 Sol and Luna, extending the GPT-6 family introduced with Astra earlier that month, anchors current trader sentiment around the next Sol release at 6.1 or higher. The models deliver Astra-level gains in coding, agentic workflows, factuality, and alignment at roughly half the API price of their GPT-5.6 predecessors, with improved caching and inference efficiency enabling broader scaling. This rapid cadence—following GPT-5.6 Sol in June/July and Astra in early September—reflects OpenAI’s focus on tiered capability and cost, directly competing with Anthropic’s Claude Opus 5.5 release the same week. Key upcoming catalysts include potential developer conferences, earnings updates, or rival model launches that could shift timelines or reveal internal progress on subsequent Sol iterations. Market-implied odds favor continued OpenAI leadership given its demonstrated release velocity and infrastructure advantages.