Amazon Nova 2 Sonic
- Best voice score of the field.
- Model
- amazon.nova-2-sonic-v1:0
- Setting
- Endpointing medium
- Voice
- matthew
- Turn taking
- Shared local turn detection
- Audio
- 16 kHz
- Cost
- The vendor's rates for this model are not yet verified.
All comparisons
AmazonOpenAI
Amazon Nova 2 Sonic vs GPT Realtime 2.1 Mini
GPT Realtime 2.1 Mini is ahead on success rate, data accuracy and response time, and Amazon Nova 2 Sonic on agent responses and stalled calls. The two tie on reliability and interruption.
Last updated Methodology by Dileep Chagam
Success rate by suite
Higher is betterAppointments59 scenariosMedicare23 scenarios
- Realtime 2.1 MiniOpenAI84%4%
- Nova 2 SonicAmazon80%6%
Verdict
Which to pick
Pick Amazon Nova 2 Sonic for getting the agent's replies right (0.4 points higher) and fewer stalled calls (1.2 points lower). Pick GPT Realtime 2.1 Mini for calls that pass every check (2.0 points higher), saving the caller's data correctly (4.6 points higher) and fast replies (0.10s sooner). They are level on reliability across repeated calls and handling interruptions.
Every metric, side by side
Reliability
Scenarios that passed on all three runs.
- Nova 2 Sonic
- 50.0%9th
- Realtime 2.1 Mini
- 50.0%9th
Level
Success rate
Calls that passed every check.
- Nova 2 Sonic
- 59.3%11th
- Realtime 2.1 Mini
- 61.4%10th
Realtime 2.1 Mini, 2.0 points higher
Agent responses
Calls where the agent's replies reached the expected outcome.
- Nova 2 Sonic
- 93.9%9th
- Realtime 2.1 Mini
- 93.5%10th
Nova 2 Sonic, 0.4 points higher
Data accuracy
Calls where everything the agent saved matched exactly.
- Nova 2 Sonic
- 59.9%11th
- Realtime 2.1 Mini
- 64.5%10th
Realtime 2.1 Mini, 4.6 points higher
Stalled calls
Calls where the agent went silent for 10 seconds or more.
- Nova 2 Sonic
- 1.2%2nd
- Realtime 2.1 Mini
- 2.5%4th
Nova 2 Sonic, 1.2 points lower
Interruption
How well it handled being talked over, 0 to 5.
- Nova 2 Sonic
- 4.991st
- Realtime 2.1 Mini
- 4.992nd
Level
Response time
Median time to start replying after the caller finishes.
- Nova 2 Sonic
- 2.18s9th
- Realtime 2.1 Mini
- 2.08s8th
Realtime 2.1 Mini, 0.10s sooner
Cost / min
One minute of call at the vendor's published rates.
- Nova 2 Sonic
- No verified rate
- Realtime 2.1 Mini
- $0.0201st
Not comparable
The small figure is the place among ranked models. The cascade is not ranked.
Realtime 2.1 Mini answers first
Realtime 2.1 Mini 2.08s, Nova 2 Sonic 2.18s at the median.
Response time, median to p90
Lower is betterMedianTo p90
Medianp90
- Realtime 2.1 MiniOpenAIRealtime 2.1 Mini: median 2.08s, p90 2.75s2.08s2.75s
- Nova 2 SonicAmazonNova 2 Sonic: median 2.18s, p90 2.76s2.18s2.76s
2.0s3.0s
What we saw on the calls
GPT Realtime 2.1 Mini
- Gets most bookings right, at a fraction of the cost.
- Model
- gpt-realtime-2.1-mini
- Setting
- Reasoning high
- Voice
- marin
- Turn taking
- Service turn detection
- Audio
- 24 kHz
- Cost
- Averaged over the calls with a usage record.
Related comparisons
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- Nova 2 Sonic vs Phonic v1
- Nova 2 Sonic vs Azure Realtime
- Nova 2 Sonic vs GPT-Live 1 + Sol low
- Nova 2 Sonic vs GPT Realtime 2.1
- Realtime 2.1 Mini vs Gemini 3.8 Live Thinking
- Realtime 2.1 Mini vs Deepslate Opal
- Realtime 2.1 Mini vs Gemini 3.8 Live
- Realtime 2.1 Mini vs Gemini 3.1 Flash Live
- Realtime 2.1 Mini vs Grok Think Fast 2.0
- Realtime 2.1 Mini vs Phonic v1
- Realtime 2.1 Mini vs Azure Realtime
- Realtime 2.1 Mini vs GPT-Live 1 + Sol low
- Realtime 2.1 Mini vs GPT Realtime 2.1
Frequently asked questions
Is Amazon Nova 2 Sonic or GPT Realtime 2.1 Mini more reliable?
They are level on reliability. Amazon Nova 2 Sonic passed 41 of 82 scenarios on all three runs, and GPT Realtime 2.1 Mini passed 41. A scenario only counts when every run of it passed.
Which should I pick, Amazon Nova 2 Sonic or GPT Realtime 2.1 Mini?
Reliability does not separate them, so pick on the metric your calls need most. GPT Realtime 2.1 Mini is ahead on success rate, data accuracy and response time, and Amazon Nova 2 Sonic on agent responses and stalled calls. The two tie on reliability and interruption.
Which saves caller data more accurately, Amazon Nova 2 Sonic or GPT Realtime 2.1 Mini?
GPT Realtime 2.1 Mini, by 4.6 points. Amazon Nova 2 Sonic saved everything exactly right on 59.9% of the calls that save data, and GPT Realtime 2.1 Mini on 64.5%. On Appointments, 82.5% against 88.8%. On Medicare, 1.5% against 0.0%. A call counts only when nothing is missing, wrong, extra or saved twice.
Is Amazon Nova 2 Sonic faster than GPT Realtime 2.1 Mini?
No. GPT Realtime 2.1 Mini starts replying 0.10s sooner at the median. Amazon Nova 2 Sonic takes 2.18s at the median and 2.76s at p90; GPT Realtime 2.1 Mini takes 2.08s and 2.75s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.
Which handles interruptions better, Amazon Nova 2 Sonic or GPT Realtime 2.1 Mini?
They score the same. Amazon Nova 2 Sonic scores 4.99 and GPT Realtime 2.1 Mini 4.99 for how well the agent handled being talked over.
Which goes silent on callers less often, Amazon Nova 2 Sonic or GPT Realtime 2.1 Mini?
Amazon Nova 2 Sonic, by 1.2 points. The agent went silent for 10 seconds or more on 1.2% of Amazon Nova 2 Sonic calls and 2.5% of GPT Realtime 2.1 Mini calls.
Which is cheaper, Amazon Nova 2 Sonic or GPT Realtime 2.1 Mini?
There is no verified per-minute rate for Amazon Nova 2 Sonic, so cost cannot be compared yet.
Where does the Amazon Nova 2 Sonic vs GPT Realtime 2.1 Mini data come from?
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, 2,952 calls across the benchmark. A call passes only when the agent said the right things and saved the right data.