Grok Voice
∣
Available in API
Voice APIs that
feel human.
Deploy intelligent speech-to-speech voice agents for customer support, sales, and more. Enterprise-grade text-to-speech and speech-to-text APIs.
#1 Tau Voice Leaderboard Sub-second latency 25+ languages$0.05 / min
Speech to Speech API
Build real-time voice agents with tool use, search, and multi-turn conversation.
- Full-duplex real-time conversations with sub-second latency
- Built-in reasoning for complex, multi-step requests
- Orchestrate dozens of tools in ambiguous real-world workflows
Text to Speech API
Natural speech from text with multiple voices and audio formats. Built for telephony and web. Enter text, choose a voice, and press Play.
- Expressive, natural voices across 25+ languages
- Speech tags for tone, pauses, whisper, and laughter
- PCM, MP3, Opus, FLAC, and WAV outputs
Speech to Text API
Enterprise-grade transcription for phone calls, meetings, videos, and podcasts.
- Entity recognition across medicine, law, and finance
- Inverse text normalization for numbers, currencies, and more
- Streaming and batch endpoints from one API
- Speaker diarization for multi-speaker audio
Custom voices
Clone a voice from a short recording and use it instantly across Grok Text to Speech and Speech to Speech APIs.
- Clone from two minutes of natural speech
- Two-stage verification: passphrase + speaker embedding match
- Inherits every TTS capability — speech tags, multilingual, streaming
The full voice stack
Everything you need to build production voice experiences — from realtime agents to batch transcription.
Realtime voice agents
Full-duplex conversations with sub-second latency
Text-to-speech
Natural speech from text across 25+ voices
Speech-to-text
Accurate transcription with speaker diarization
Tool calling
Call APIs and take actions mid-conversation
Custom voices
Clone or create voices for your brand
25+ languages
Multilingual with natural intonation per locale
Sub-second latency
Fast enough for real conversations at scale
Speech tags
Control whisper, laughter, pauses, and tone
Speaker diarization
Identify who said what in multi-speaker audio
Streaming & batch
Realtime WebSocket or async batch processing
Multiple audio formats
PCM, MP3, Opus, FLAC, WAV, and more
Session control
Dynamic instructions, context, and tool updates
Enterprise ready
SOC 2, HIPAA eligible, and GDPR compliant
Text normalization
Proper formatting of numbers, dates, addresses
Interruption handling
Natural turn-taking with barge-in support
Expressive voices across 25+ languages
Wellness
Support
Soft, empathetic, and soothing.
Pricing
Simple, transparent pricing
Straightforward usage-based pricing with no hidden fees, minimums, or force upgrades.
Speech to Speech
Real-time voice conversations over WebSocket
$0.05 / min·$3.00 / hr
Text to Speech
Convert text to natural speech
$15.00 / 1M characters
Speech to Text
Transcribe audio files and live streams
$0.10 / hr·$0.20 / hr(streaming)
Need higher limits or rollout help?
Talk with SpaceXAI about onboarding, custom limits, and enterprise deployment.
Enterprise
Trust, controls, and deployment support
Enterprise-ready controls, compliance, security, and scale.
SOC 2 Type II
Audited controls for security, availability, and confidentiality.
HIPAA eligible
BAA available for healthcare applications handling protected health information.
GDPR and DPA support
Data processing agreements and EU data residency options.
High availability
Multi-region infrastructure for enterprise workloads.
Custom rate limits
Concurrent session and request limits scaled to your traffic.
SSO and audit controls
SAML SSO, role-based access, and audit logging for your team.
Zero Data Retention
Enable zero data retention for your deployments.
Ready to build with voice?
Get an API key and start building in minutes, or talk to our team about enterprise deployment.
Last updated Oct 08, 2026