xAI has released Grok Voice Think Fast 1.0, its new flagship voice model for developers building real-time voice agents across customer support, sales, bookings, and enterprise workflows. The model is now available through the xAI API and can be tested in the company’s voice playground. xAI positions it as its most capable voice agent so far, built for complex, ambiguous, multi-step tasks where a system needs to collect information, call tools, confirm details, and continue the conversation with low latency.
Introducing Grok Voice Think Fast 1.0
— xAI (@xai) April 23, 2026
A state-of-the-art voice model built for complex, multi-step workflows with snappy responses and high accuracy.
It takes the top spot on the Tau Voice Bench and handles real-world messiness like noise, accents, and interruptions better than…
The new model is aimed at businesses that want to replace or augment phone-based workflows with AI agents capable of handling noisy calls, accents, interruptions, and turn-taking. xAI says Grok Voice Think Fast 1.0 supports more than 25 languages and is designed for use cases such as:
- Customer support
- Phone sales
- Appointment booking
- Restaurant reservations
- Order handling
- Returns
- Billing disputes
- Telecom troubleshooting
- Airline itinerary changes
A key part of the release is real-time reasoning. xAI says the model can reason in the background while keeping response latency unchanged, allowing it to handle harder requests without making the conversation feel slower. The company also highlights structured data capture as a core capability, including collecting and confirming names, addresses, emails, phone numbers, account numbers, and corrections spoken during a call.
The model is already powering Starlink’s phone sales and customer support experience at +1 (888) GO STARLINK. According to xAI, the Starlink deployment uses 28 tools across hundreds of sales and support workflows, reaches a 20% sales conversion rate from inquiries, and resolves 70% of customer support inquiries autonomously without a human in the loop. The agent can also perform hardware troubleshooting, issue hardware replacements, and grant service credits.
xAI frames the release as a move from simple voice chat toward operational voice agents that can complete real business workflows. The company says Grok Voice Think Fast 1.0 ranks first on the τ-voice Bench leaderboard, a benchmark for full-duplex voice agents tested under realistic conditions such as background noise, accents, interruptions, and turn-taking.
For xAI, this expands Grok beyond consumer chat and into enterprise automation through API-based voice infrastructure. The company is tying the model to practical deployments rather than just demos, with Starlink serving as the main proof point for high-volume customer support and sales. The launch also puts xAI more directly into the market for real-time AI agents that can speak, reason, use tools, and act inside business systems during live calls.
