Grok Voice Think Fast 2.0 targets customer service, sales and phone use cases, with new benchmark scores showing stronger speech performance and a 0.70-second first response time.
xAI has expanded its Grok lineup with Grok 4.5 and Grok Voice Think Fast 2.0, a real-time voice model aimed at enterprise uses including customer service, sales and phone-based workflows. New information shows Artificial Analysis ranked Think Fast 2.0 second on a speech composite index with a score of 82.9%, while the model led the τ-Voice customer-service benchmark at 56.5%. Its first response time was listed at 0.70 seconds. The pricing picture has also become clearer. Earlier information said Grok Voice Think Fast 2.0 was priced at $0.08 per minute of audio, while separate details had indicated xAI’s Voice API started at $0.05 per minute for agent usage. The latest update says API pricing rose from $0.05 to $0.08 per minute. xAI has also said Grok-Voice-Latest will be upgraded on Aug. 5 from Grok-Voice-Think-Fast-1.0 to Grok-Voice-Think-Fast-2.0. Announced on July 29, less than three months after Think Fast 1.0 debuted in April 2026, the new model is designed to listen, reason and speak simultaneously with sub-second latency, support more than 25 languages, and work in noisy environments and across varied accents. The product is aimed at enterprise voice automation rather than crypto or blockchain applications, though major AI launches can still influence sentiment around AI-linked tokens.