Elon Musk’s artificial intelligence company SpaceXSI, formerly xAI, today released Grok Voice 3.0, a new version of the speech-to-speech model behind its Voice Agent API.

SpaceXSI is pitching the model to businesses that handle customer support and sales calls with voice agents. Independent testing firm Artificial Analysis ranks it first among models of its type. Artificial Analysis, which bases its rankings on reasoning tests, task success and listener votes in blind head-to-head calls, rated Grok Voice 3.0 at 86.9 on its Speech-to-Speech Index.

On the same index, OpenAI Group PBC’s GPT-Live-1, tested with OpenAI’s GPT-6 Astra model handling the reasoning, scored 83.2, and Google LLC’s Gemini 3.8 Live landed at 82.6. Full Duplex Bench, which grades how naturally a model copes with pauses and interruptions, gave the new Grok model 97%.

The OpenAI model kept a narrow lead on Tau-Voice, a test built around support calls with heavy accents and background noise, at 74.5% against 71.6%. SpaceXSI says its model got to first audio about 40% faster on that test. A task in Artificial Analysis’ Big Bench Audio run cost about 2.5 cents to complete on Grok Voice 3.0, compared with 3 cents on GPT-Live-1 and 5.5 cents on OpenAI’s GPT-Realtime-2.1.

Outside Artificial Analysis’ testing, Grok Voice 3.0 also led for accuracy on ServiceNow Inc.’s open-source EVA-Bench, scoring 74% across more than 200 enterprise scenarios. No model did better with accuracy and customer experience scored together. Nitin Aggarwal, a senior director of product management at ServiceNow, said the model “pairs top accuracy with a natural, responsive conversation.”

In production, Tesla Inc. vehicles already account for millions of Grok Voice conversations a day. Drivers lean on it to check calendars and answer email. Bigger errands such as booking dinner go through Grok Bot, and its voice mode runs on the new model as well.

At Starlink, the SpaceX satellite internet business, Grok Voice answers about 20,000 customer calls a day in several languages. Roughly 70% are resolved without a human stepping in, SpaceXSI said, and one in four sales calls ends in a purchase before the caller hangs up.

SpaceX acquired xAI in February. The AI unit was renamed SpaceXAI in July and took on the SpaceXSI name earlier this month.

Grok Voice 3.0 is available now in the Voice Agent API at eight cents a minute, or $4.80 an hour, the same price as Grok Voice 2.0. Developers whose agents point to the grok-voice-latest model alias have already been moved to the new version without any changes on their end.

Photo: SpaceXSI