Rime Prism
68.3%
ReliabilityReliability
6th of 14
1.34s
Median replyMedian response time
1st of 14
Reliability vs. response time
Higher and further left is better
For the wider field, see our pick of the best voice AI APIs for real-time audio.
Rime Prism against every other model
Scenarios that passed on all 3 runs, pass³. Higher is better.
- 01Phonic v1Intelligence high90.2%
- 02Grok Voice 3.0Reasoning high81.7%
- 03GPT Realtime 2.1Reasoning high79.3%
- 04GPT-Live 1 + GPT-6 SolSol on low thinking75.6%
- 05Azure RealtimeNo reasoning setting70.7%
- 06PrismNo reasoning setting68.3%
- 07Grok Voice Think Fast 2.0Reasoning high67.1%
- 08Gemini 3.1 Flash Live PreviewThinking level high62.2%
- 09Deepslate OpalNo reasoning setting58.5%
- 10Higgs RealtimeNo reasoning setting56.1%
- 11Gemini 3.8 Live Extended ThinkingThinking level high52.4%
- 12Amazon Nova 2 SonicEndpointing medium50.0%
- 13GPT Realtime 2.1 MiniReasoning high50.0%
- 14Gemini 3.8 LiveNo thinking level41.5%
- refCascadeNot ranked82.9%
Where Rime Prism struggled
Rime Prism passed 88.7% of booking calls and 63.8% of Medicare calls.
- Wrong value39 · 39%
- Step skipped26 · 26%
- Field left out24 · 24%
Fields it got wrong most: route_id, lead_id, consent_id
How fast Rime Prism replies
Half of Rime Prism's replies start within 1.34s of the caller finishing, and 19 in 20 within 1.65s. That is the fastest of 14.
Half of replies
P50
9 in 10 replies
P90
19 in 20 replies
P95
Rime Prism head to head
How much audio Rime Prism was tested on
246 live calls: 82 scenarios, each run three times. The median call ran 1:33.
- Live calls
- 246
- Scenarios
- 82
- Booking calls
- 177
- Medicare calls
- 69
- Replies per call
- 10.1
- Median call
- 1:33
82 scenarios, the same for every model. See every test case
Rime Prism FAQ
How reliable is Rime Prism?
Rime Prism passed 56 of 82 scenarios on all three runs, 68.3%, 6th of 14 realtime models. Across all 246 calls, 81.7% passed every check.
Rime Prism passed 56 of 82 scenarios on all three runs, 68.3%, 6th of 14 realtime models. Across all 246 calls, 81.7% passed every check.
Rime Prism starts replying 1.34s after the caller finishes at the median, 1.57s at P90 and 1.65s at P95. That is 1st fastest of 14 at the median, measured on the call audio.
When it saved data wrong, the most common mistake was wrong value, 39% of them.
Rime Prism saved everything exactly right on 84.5% of the calls that save data, 6th of 14. On Booking calls, 92.4%. On Medicare calls, 64.2%.
There is no verified per-minute rate for Rime Prism, so it is left out of the cost ranking.
Cekura ran Rime Prism as the whole agent in the same open-source Pipecat pipeline as every other model, with the same prompt, tools and connection. A simulated caller worked through 82 scenarios on live calls, three times each: 246 calls for Rime Prism. A call passes only when the agent said the right things and saved the right data.
Test your voice agent the same way.
Cekura runs these simulated calls on your agent and scores every one.