Recent OpenAI and Anthropic-linked releases in early October 2026 have driven trader sentiment on further substantive progress toward the Riemann Hypothesis. An unreleased OpenAI model produced a manuscript establishing a zero-free half-plane at 7/8 for the Riemann zeta function and related L-functions under the quasi-Riemann Hypothesis, tightening bounds on zero locations and improving error terms in the prime number theorem. Concurrently, an AI-assisted proof raised the proven share of simple, critical-line zeros above 67%, with formal verification via Lean. These represent measurable advances on RH-adjacent questions without resolving the full conjecture, which remains open. Traders are monitoring peer review, formalization checks, and any follow-on results that could shift implied probabilities for near-term milestones.