Grok Voice 3.0 vs Rime Prism

Grok Voice 3.0 is more reliable, by 13.4 points. Grok Voice 3.0 passed 67 of 82 scenarios on all three runs, and Rime Prism passed 56. 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 of Rime Prism on reliability, success rate, agent responses, data accuracy and interruption. The two tie on calls where the agent went quiet and response time.

Grok Voice 3.0, by 2.9 points. Grok Voice 3.0 saved everything exactly right on 87.3% of the calls that save data, and Rime Prism on 84.5%. On Booking calls, 98.2% against 92.4%. On Medicare calls, 59.1% against 64.2%. A call counts only when nothing is missing, wrong, extra or saved twice.

They start replying at the same median time. Grok Voice 3.0 takes 1.34s at the median and 1.62s at p90; Rime Prism takes 1.34s and 1.57s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.

Grok Voice 3.0, by 0.07 on a 0 to 5 scale. Grok Voice 3.0 scores 4.98 and Rime Prism 4.91 for how well the agent handled being talked over.

They go quiet on the same share of calls. The agent went quiet for 10 seconds or more on 0.0% of Grok Voice 3.0 calls and 0.0% of Rime Prism calls.

There is no verified per-minute rate for Rime Prism, 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, 3,690 calls across the benchmark. A call passes only when the agent said the right things and saved the right data.