xAI Grok Voice Agent API — $0.05/Min, Claims 5x Faster Than Competitors, OpenAI Realtime API Compatible
xAI·medium signal
xAI's Grok Voice Agent API is now available on Product Hunt with STT and TTS APIs reaching general availability. Built on the same stack powering Grok Voice for mobile apps and Tesla vehicles, it claims sub-1-second time-to-first-audio (nearly 5x faster than the closest competitor) at $0.05/min with 100 concurrent sessions per team. Crucially, it's compatible with the OpenAI Realtime API specification and available via LiveKit plugin — making it a drop-in alternative for builders already using OpenAI's voice infrastructure.