# Grok Voice Think Fast 2.0

SpaceXAI, released 2026-07-29

**Verdict: conditional.** Grok Voice Think Fast 2.0 is SpaceXAI's next-generation speech-to-speech model with a parallel reasoning architecture that makes it substantially smarter than conventional voice models with no latency penalty. Its transcription accuracy destroys dedicated STT competitors in noisy environments — the deciding factor for production voice agents. But at $0.08/min, developer/API-only with no consumer-facing assistant, it's a premium specialist — not for cost-sensitive or general-purpose voice use. Last verified 2026-07-30.

## Pricing

- Input: $0.08 / min of audio (speech-to-speech)
- Output: Included in speech-to-speech rate
- Context: API-only

## Strengths

- Parallel reasoning during speech — the model thinks while it speaks, improving intelligence without latency penalty
- Transcription in noisy environments — 10x advantage over dedicated STT models when background noise is present
- Voice agent deployment at scale — 25+ languages, 21 voices, no-code Voice Agent Builder for production
- Consumer voice assistant use — model is developer/API-only, no end-user conversational product like ChatGPT Voice
- Cost-sensitive high-volume telephony — at $0.08/min with $0.01/min telephony surcharge, budget STT-only pipelines are cheaper

## Benchmarks

- Artificial Analysis speech-to-speech: 82.9% (https://x.ai/news/grok-voice-think-fast-2)
- Artificial Analysis speech-to-speech (v1.0): 75.7% (https://x.ai/news/grok-voice-think-fast-2)
- Conversational Dynamics (Full Duplex Bench): 95.1% (https://x.ai/news/grok-voice-think-fast-2)

## Sources

- [xAI Grok Voice Think Fast 2.0 announcement (official)](https://x.ai/news/grok-voice-think-fast-2)
- [Times of AI Grok Voice expansion](https://www.timesofai.com/news/grok-gets-21-new-ai-voices/)
- [xAI pricing: voice transcribe (no 2.0 id listed)](https://docs.x.ai/developers/pricing)
- [xAI Release Notes (official)](https://docs.x.ai/developers/release-notes)
- [TestingCatalog Grok Voice 2.0 launch](https://www.testingcatalog.com/spacexai-launches-grok-voice-think-fast-2-0-on-agent-builder/)
- [BASENOR Grok Voice 2.0 developer guide](https://www.basenor.com/blogs/news/grok-voice-think-fast-2-0-what-developers-need-to-know)

Canonical: https://neomanex.com/models/grok-voice-think-fast-2-0