Deepslate Opal vs Amazon Nova 2 Sonic

Deepslate Opal is more reliable, by 1.4 points. Deepslate Opal handled 9 of 70 real callers well on all three runs, and Amazon Nova 2 Sonic 8. A caller only counts when every run of the call scored 80 or more.

For a voice agent, Deepslate Opal, since it handles more real callers well on every run. Deepslate Opal is ahead on ELO rating, hearing score, speaking score, reliability, calls handled well and median latency, and Amazon Nova 2 Sonic on turn taking score, calls fully resolved and calls where the agent went quiet. The two tie on task handling score.

Amazon Nova 2 Sonic, by 1.4 points higher. Deepslate Opal fully resolved 12.4% of calls and Amazon Nova 2 Sonic 13.8%. A call counts only when every step the caller needed was done.

Yes. Deepslate Opal starts replying 0.30s sooner at the median. Deepslate Opal takes 2.46s at the median and 3.16s at p90; Amazon Nova 2 Sonic takes 2.76s and 3.40s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.

Amazon Nova 2 Sonic, by 9.0 points. The agent went quiet for 10 seconds or more on 16.2% of Deepslate Opal calls and 7.1% 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 with the same prompt, tools and phone connection. Both took the same 70 recorded real human callers on live calls, three times each. Each call is graded on 25 skills across Hearing, Turn Taking, Task Handling and Speaking, and passes at a score of 80 out of 100.