GPT-Live-1 (Astra, medium) leads Tau Voice at 67.9%, followed by GPT-Live-1 (Sol, low) at 59.3% and Grok Voice Think Fast 2.0 High at 56.5%, driving its overall Index lead. Both GPT-Live-1 configurations are currently based on one trial. On Big Bench Audio, they achieve 90.1% and 89.0%, respectively, behind Grok at 97.2%. On our Full Duplex Bench subset, they score 94.9% and 97.3%, respectively; this benchmark is reported separately from the Index.