OpenAI's GPT models have been among the leading AI systems, but competition in the language model space has intensified dramatically. The market uses "Style Control On" as a specific evaluation criterion, suggesting it measures AI model performance under particular control conditions—likely assessing consistency, instruction adherence, or tone management across prompts. With odds at just 4%, traders indicate minimal probability that OpenAI will rank as the second-best model under this specific framework by April 30, 2026. This low assessment reflects the strength of competing models from Anthropic, Google, and other leading AI laboratories that have demonstrated comparable or superior capabilities in recent evaluations. The resolution depends on how the Style Control On benchmark ranks available models at month-end, creating a clear, measurable outcome. Market odds have remained relatively flat near 4% throughout the period, suggesting strong consensus among traders. Only thirteen days remain until expiration, making this a market that primarily reflects current beliefs about AI model hierarchies rather than expectations of significant ranking shifts.