xAI's emphasis on reinforcement learning scaled with massive compute continues to drive Grok's reasoning gains, positioning it competitively among frontier models on advanced math benchmarks like FrontierMath. Developed by Epoch AI, the benchmark features hundreds of original, unpublished problems spanning number theory, algebraic geometry, and other research-level topics that typically require hours or days for human mathematicians. As of early 2026, leading systems such as GPT-5 variants and specialized agents reach roughly 40-48% on tiers 1-4, while Grok-4 and its variants demonstrate strong results on related reasoning tasks but have not yet matched the top FrontierMath scores. With June 30 approaching, any internal model iteration, post-training optimization, or capability demonstration from xAI could shift trader sentiment, though the benchmark's contamination-resistant design and high difficulty limit rapid jumps without targeted advancements.