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GPT-Live 1 + GPT-6 Sol (low thinking) vs Amazon Nova 2 Sonic

GPT-Live 1 + GPT-6 Sol (low thinking) is ahead on reliability, success rate, agent responses, data accuracy and response time, and Amazon Nova 2 Sonic on stalled calls and interruption.

Last updated Methodology by Dileep Chagam

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Success rate by suite

Higher is better
Appointments59 scenariosMedicare23 scenarios
  • GPT-Live 1 + Sol lowOpenAI
    97%
    49%
  • Nova 2 SonicAmazon
    80%
    6%
Each model's share of calls that passed every check, on each suite.
Verdict

Which to pick

Pick GPT-Live 1 + GPT-6 Sol (low thinking) for reliability across repeated calls (25.6 points higher), calls that pass every check (24.4 points higher), getting the agent's replies right (6.1 points higher), saving the caller's data correctly (29.1 points higher) and fast replies (0.16s sooner). Pick Amazon Nova 2 Sonic for fewer stalled calls (11.0 points lower) and handling interruptions (0.10 higher).

Every metric, side by side

Reliability

Scenarios that passed on all three runs.

GPT-Live 1 + Sol low
75.6%2nd
Nova 2 Sonic
50.0%9th

GPT-Live 1 + Sol low, 25.6 points higher

Success rate

Calls that passed every check.

GPT-Live 1 + Sol low
83.7%3rd
Nova 2 Sonic
59.3%11th

GPT-Live 1 + Sol low, 24.4 points higher

Agent responses

Calls where the agent's replies reached the expected outcome.

GPT-Live 1 + Sol low
100.0%1st
Nova 2 Sonic
93.9%9th

GPT-Live 1 + Sol low, 6.1 points higher

Data accuracy

Calls where everything the agent saved matched exactly.

GPT-Live 1 + Sol low
89.0%2nd
Nova 2 Sonic
59.9%11th

GPT-Live 1 + Sol low, 29.1 points higher

Stalled calls

Calls where the agent went silent for 10 seconds or more.

GPT-Live 1 + Sol low
12.2%11th
Nova 2 Sonic
1.2%2nd

Nova 2 Sonic, 11.0 points lower

Interruption

How well it handled being talked over, 0 to 5.

GPT-Live 1 + Sol low
4.8910th
Nova 2 Sonic
4.991st

Nova 2 Sonic, 0.10 higher

Response time

Median time to start replying after the caller finishes.

GPT-Live 1 + Sol low
2.02s6th
Nova 2 Sonic
2.18s9th

GPT-Live 1 + Sol low, 0.16s sooner

Cost / min

One minute of call at the vendor's published rates.

GPT-Live 1 + Sol low
$0.0552nd
Nova 2 Sonic
No verified rate

Not comparable

The small figure is the place among ranked models. The cascade is not ranked.

GPT-Live 1 + Sol low answers first

GPT-Live 1 + Sol low 2.02s, Nova 2 Sonic 2.18s at the median.

Response time, median to p90

Lower is betterMedianTo p90
Medianp90
  • GPT-Live 1 + Sol lowOpenAI
    GPT-Live 1 + Sol low: median 2.02s, p90 2.42s
    2.02s2.42s
  • Nova 2 SonicAmazon
    Nova 2 Sonic: median 2.18s, p90 2.76s
    2.18s2.76s
2.0s3.0s
Seconds from the caller finishing to the agent starting to reply, per model.

What we saw on the calls

GPT-Live 1 + GPT-6 Sol (low thinking)

  • Near perfect on bookings, run after run.
All 4 notes on GPT-Live 1 + Sol low
Model
gpt-live-1
Setting
Delegates reasoning and tools to Sol
Voice
marin
Turn taking
Service turn detection
Audio
24 kHz
Cost
Includes the delegated backend model.

Amazon Nova 2 Sonic

  • Best voice score of the field.
All 3 notes on Nova 2 Sonic
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.
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Frequently asked questions

Is GPT-Live 1 + GPT-6 Sol (low thinking) or Amazon Nova 2 Sonic more reliable?

GPT-Live 1 + GPT-6 Sol (low thinking) is more reliable, by 25.6 points. GPT-Live 1 + GPT-6 Sol (low thinking) passed 62 of 82 scenarios on all three runs, and Amazon Nova 2 Sonic passed 41. A scenario only counts when every run of it passed.

Which should I pick, GPT-Live 1 + GPT-6 Sol (low thinking) or Amazon Nova 2 Sonic?

For a phone agent, GPT-Live 1 + GPT-6 Sol (low thinking), since it gets more scenarios right on every run. GPT-Live 1 + GPT-6 Sol (low thinking) is ahead on reliability, success rate, agent responses, data accuracy and response time, and Amazon Nova 2 Sonic on stalled calls and interruption.

Which saves caller data more accurately, GPT-Live 1 + GPT-6 Sol (low thinking) or Amazon Nova 2 Sonic?

GPT-Live 1 + GPT-6 Sol (low thinking), by 29.1 points. GPT-Live 1 + GPT-6 Sol (low thinking) saved everything exactly right on 89.0% of the calls that save data, and Amazon Nova 2 Sonic on 59.9%. On Appointments, 100.0% against 82.5%. On Medicare, 60.6% against 1.5%. A call counts only when nothing is missing, wrong, extra or saved twice.

Is GPT-Live 1 + GPT-6 Sol (low thinking) faster than Amazon Nova 2 Sonic?

Yes. GPT-Live 1 + GPT-6 Sol (low thinking) starts replying 0.16s sooner at the median. GPT-Live 1 + GPT-6 Sol (low thinking) takes 2.02s at the median and 2.42s at p90; Amazon Nova 2 Sonic takes 2.18s and 2.76s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.

Which handles interruptions better, GPT-Live 1 + GPT-6 Sol (low thinking) or Amazon Nova 2 Sonic?

Amazon Nova 2 Sonic, by 0.10 on a 0 to 5 scale. GPT-Live 1 + GPT-6 Sol (low thinking) scores 4.89 and Amazon Nova 2 Sonic 4.99 for how well the agent handled being talked over.

Which goes silent on callers less often, GPT-Live 1 + GPT-6 Sol (low thinking) or Amazon Nova 2 Sonic?

Amazon Nova 2 Sonic, by 11.0 points. The agent went silent for 10 seconds or more on 12.2% of GPT-Live 1 + GPT-6 Sol (low thinking) calls and 1.2% of Amazon Nova 2 Sonic calls.

Which is cheaper, GPT-Live 1 + GPT-6 Sol (low thinking) or Amazon Nova 2 Sonic?

There is no verified per-minute rate for Amazon Nova 2 Sonic, so cost cannot be compared yet.

Where does the GPT-Live 1 + GPT-6 Sol (low thinking) vs Amazon Nova 2 Sonic 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.