Grok Voice 3.0vsAmazon Nova 2 Sonic

Grok Voice 3.0 is more reliable, by 31.7 points. Grok Voice 3.0 passed 67 of 82 scenarios on all three runs, and Amazon Nova 2 Sonic passed 41. A scenario only counts when every run of it passed.

For a voice agent, Grok Voice 3.0, since it gets more scenarios right on every run. Grok Voice 3.0 is ahead on reliability, success rate, agent responses, data accuracy, calls where the agent went quiet and response time, and Amazon Nova 2 Sonic on interruption.

Grok Voice 3.0, by 27.4 points. Grok Voice 3.0 saved everything exactly right on 87.3% of the calls that save data, and Amazon Nova 2 Sonic on 59.9%. On Booking calls, 98.2% against 82.5%. On Medicare calls, 59.1% against 1.5%. A call counts only when nothing is missing, wrong, extra or saved twice.

Yes. Grok Voice 3.0 starts replying 0.84s sooner at the median. Grok Voice 3.0 takes 1.34s at the median and 1.62s at p90; Amazon Nova 2 Sonic takes 2.18s and 2.76s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.

Amazon Nova 2 Sonic, by 0.02 on a 0 to 5 scale. Grok Voice 3.0 scores 4.98 and Amazon Nova 2 Sonic 4.99 for how well the agent handled being talked over.

Grok Voice 3.0, by 1.2 points. The agent went quiet for 10 seconds or more on 0.0% of Grok Voice 3.0 calls and 1.2% of Amazon Nova 2 Sonic calls.

There is no verified per-minute rate for Amazon Nova 2 Sonic, so cost cannot be compared yet.

Cekura ran both as the whole agent in the same open-source Pipecat pipeline, with the same prompt, tools and connection. A simulated caller worked through all 82 scenarios on live calls, three times each, 3,198 calls across the benchmark. A call passes only when the agent said the right things and saved the right data.