Larry Jing

SpaceXAI has released Grok Voice Think Fast 2.0 today, with the High reasoning variant debuting at #2 on the Artificial Analysis Speech to Speech Index at 82.9%, and #1 on Tau Voice for Agentic Performance at 56.5% - among the fastest models at 0.70s Time to First Audio Grok Voice Think Fast 2.0 is SpaceXAI's successor to Grok Voice Think Fast 1.0 (75.7% on the Speech to Speech Index). It is the only model in the Index's top five with an average Time to First Audio under 1 second, achieving 0.70 seconds vs. 1.14 seconds for the next fastest, GPT-Realtime-2 High. Key takeaways: ➤ Speech to Speech Index: Grok Voice Think Fast 2.0 High debuts at #2 at 82.9%, only behind Qwen Audio 3.0 Realtime Plus (84.1%) and ahead of GPT-Realtime-2.1 High (79.1%) and GPT-Realtime-2 High (77.2%). This is up 7.3 percentage points from Grok Voice Think Fast 1.0 (75.7%) ➤ Speech to Speech Index by Benchmark: On Tau Voice, Grok Voice Think Fast 2.0 High is the new leader at 56.5%, just ahead of Qwen Audio 3.0 Realtime Plus at 54.6% and its predecessor Grok Voice Think Fast 1.0 at 52.1%. On Big Bench Audio, it achieves 97.2%, behind leader Qwen Audio 3.0 Realtime Plus at 99.2%. On our Full Duplex Bench subset, it scores 95.1%, up from 77.8% for Grok Voice Think Fast 1.0, the largest driver of its index gain, behind Qwen Audio 3.0 Realtime Plus at 98.4% ➤ Speed: The model’s average Time to First Audio on Big Bench Audio is 0.70 seconds, faster than GPT-Realtime-2 High (1.14s), GPT-Realtime-2.1 High (1.21s), and Grok Voice Think Fast 1.0 (1.25s), and well ahead of Qwen Audio 3.0 Realtime Plus (4.02s) ➤ Price: Grok Voice Think Fast 2.0 is priced at $4.80 per hour of input audio, up from $3.00 for Grok Voice Think Fast 1.0 and more expensive than Qwen Audio 3.0 Realtime Plus ($4.42) and GPT-Realtime-2 High ($4.14), but ~2.2x cheaper than GPT-Realtime-2.1 High ($10.75) Congratulations @SpaceXAI @elonmusk! See below for more detail ⬇️

Announcing Grok Voice Think Fast 2.0, our next-generation voice model with improved intelligence, transcription accuracy, and conversational capabilities. x.ai/news/grok-voic…

Deployment of 20 @Starlink V3 satellites complete. Today's test will provide critical data as we prepare to expand our Starlink constellation

Today, we're adding 21 new flagship voices to Grok via API. x.ai/news/new-flags…

Introducing Voice Agent Builder: a no-code platform to create human-like voice agents with Grok Voice. Available today at $0.05 / min. x.ai/voice

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