Artificial intelligence's mathematical reasoning capabilities represent one of the most contested domains in the current AI race. As the industry moves toward May 2026, the question of which company will be recognized as having the best math AI model becomes increasingly important for researchers, developers, and organizations building on cutting-edge AI technology. This market group aggregates four prediction markets exploring the likelihood that DeepSeek, OpenAI, Google, or Anthropic will achieve this distinction by the end of May 2026. These four companies represent the leading voices in AI development, each bringing distinctive research approaches and technical strategies to advancing mathematical problem-solving capabilities. By grouping these markets together, observers can see how market confidence is distributed across the major contenders in real time. The prices below reflect market sentiment: a higher price indicates stronger confidence that a particular company will be recognized with the best math AI model, while a lower price suggests more skepticism about that outcome. Price movements may signal new research announcements, published benchmarks, or competitive developments in mathematical AI capabilities. The relative positioning of these prices reveals not just which company is favored, but by how much—a competitive race shows similar prices across multiple companies, while a clear leader emerges when one company's probability estimate substantially exceeds the others. These market estimates offer a snapshot of where the broader AI research community believes mathematical problem-solving capabilities are advancing most rapidly in 2026.