xAI Releases Grok Voice Think Fast 2.0
New voice model ranks high on speech benchmarks with faster response but increased audio input costs.
SpaceXAI announced Grok Voice Think Fast 2.0 as its next-generation speech-to-speech model offering gains in intelligence, transcription accuracy, and conversational ability. The High reasoning variant placed second on the Artificial Analysis Speech to Speech Index and first on Tau Voice for agentic performance. It records the lowest latency among top entries with 0.70 seconds time to first audio. Pricing for input audio rose to 4.80 dollars per hour from 3.00 dollars in the prior version, positioning it above several competitors yet below others. Official sources confirm the release and benchmark results from independent evaluations.
Announcing Grok Voice Think Fast 2.0, our next-generation voice model with improved intelligence, transcription accuracy, and conversational capabilities.
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Artificial Analysis@ArtificialAnlysSpaceXAI 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…
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AA Artificial Analysis@ArtificialAnlysGrok Voice Think Fast 2.0 High delivers its intelligence gains with a comparably lower latency trade-off - average Time to First Audio on the Big Bench Audio benchmark is 0.70 seconds, making it the only model in the top 5 of our Speech to Speech Index under 1 second. This is…
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AA Artificial Analysis@ArtificialAnlysGrok Voice Think Fast 2.0 High costs $4.80 per hour of input audio, up from $3.00 for Grok Voice Think Fast 1.0. This places it above 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).
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AA Artificial Analysis@ArtificialAnlysGrok Voice Think Fast 2.0 High costs $4.80 per hour of input audio, up from $3.00 for Grok Voice Think Fast 1.0. This places it above 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).
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AA Artificial Analysis@ArtificialAnlysCompare Grok Voice Think Fast 2.0 to other native Speech to Speech models: https://artificialanalysis.ai/models/speech-to-speech
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