Elon Musk, head of xAI, retweeted the product account stating that the grok bot can now talk. The robot opened early testing to the public on August 11, positioned as an AI teammate that can log into user tools and complete tasks, previously focused on text interaction. The voice layer connects to grok voice, with the current generation being the think fast 2.0 released on July 29, compressing listening, thinking, and speaking into the same model. The official latency is about 0.70 seconds, utilizing a bidirectional websocket for simultaneous audio input and output, with the interface supporting over 25 languages, accents, and interruptions, along with voice cloning. Testing initially launched on desktop and iOS, with Android following in early September, targeting supergrok heavy and some high-tier cursor subscriptions. The product builds robots based on roles including research, writing, consulting, inbox management, and sales, continuing to operate after the computer is shut down. Grok voice is available in Tesla vehicles, while Starlink customer service and sales handle over 15,000 calls daily. For developers, grok voice is available on fal.ai, charging approximately $0.00083 per second of audio, with continuous one-hour conversations costing about $3. The flagship voice has expanded from an initial 5 to an additional 21. The bot's ability to speak combines a capable teammate and a voice that can make calls into the same product.