Amazon Nova 2 Sonic vs Cascade

Cascade is more reliable, by 14.3 points. Amazon Nova 2 Sonic handled 8 of 70 real callers well on all three runs, and Cascade 18. A caller only counts when every run of the call scored 80 or more.

On reliability, no: the cascade handles more callers well on every run. Cascade is ahead on ELO rating, hearing score, speaking score, task handling score, reliability, calls handled well and median latency, and Amazon Nova 2 Sonic on turn taking score and calls fully resolved. The two tie on calls where the agent went quiet. Both ran as the same agent, with the same prompt and tools.

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

No. Cascade starts replying 0.70s sooner at the median. Amazon Nova 2 Sonic takes 2.76s at the median and 3.40s at p90; Cascade takes 2.06s and 2.49s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.

They go quiet on the same share of calls. The agent went quiet for 10 seconds or more on 7.1% of Amazon Nova 2 Sonic calls and 7.1% of Cascade calls.

There is no verified per-minute rate for Amazon Nova 2 Sonic and Cascade, 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. Cascades run the same agent for reference and are never ranked.