Grok Voice 3.0 puts xAI on top of the speech index at $0.08 a minute

On 14 October 2026, xAI launched Grok Voice 3.0, a speech-to-speech model that takes first place on Artificial Analysis’s Speech-to-Speech Index (86.9) at an unchanged $0.08 per minute. Call centers still weighing a voice agent now have a quantified benchmark to cross against their own scenarios.