Amazon Nova 2 Sonic vs GPT Realtime 2.1

GPT Realtime 2.1 is more reliable, by 29.3 points. Amazon Nova 2 Sonic passed 41 of 82 scenarios on all three runs, and GPT Realtime 2.1 passed 65. A scenario only counts when every run of it passed.

For a voice agent, GPT Realtime 2.1, since it gets more scenarios right on every run. GPT Realtime 2.1 is ahead on reliability, success rate, agent responses, data accuracy and response time, and Amazon Nova 2 Sonic on calls where the agent went quiet and interruption.

GPT Realtime 2.1, by 32.1 points. Amazon Nova 2 Sonic saved everything exactly right on 59.9% of the calls that save data, and GPT Realtime 2.1 on 92.0%. On Booking calls, 82.5% against 95.9%. On Medicare calls, 1.5% against 81.8%. A call counts only when nothing is missing, wrong, extra or saved twice.

No. GPT Realtime 2.1 starts replying 0.25s sooner at the median. Amazon Nova 2 Sonic takes 2.18s at the median and 2.76s at p90; GPT Realtime 2.1 takes 1.94s and 2.46s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.

Amazon Nova 2 Sonic, by 0.01 on a 0 to 5 scale. Amazon Nova 2 Sonic scores 4.99 and GPT Realtime 2.1 4.98 for how well the agent handled being talked over.

Amazon Nova 2 Sonic, by 2.0 points. The agent went quiet for 10 seconds or more on 1.2% of Amazon Nova 2 Sonic calls and 3.3% of GPT Realtime 2.1 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, 3,690 calls across the benchmark. A call passes only when the agent said the right things and saved the right data.