CekuraBench
All comparisons
OpenAIAmazon

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.

Compare

Success rate by suite

Appointments59 scenariosMedicare23 scenarios
  • GPT Realtime 2.1OpenAI
    92%
    81%
  • GPT-Live 1 + Sol lowOpenAI
    97%
    49%
  • Gemini 3.8 Live ThinkingGoogle
    82%
    61%
  • Grok Think Fast 2.0xAI
    96%
    25%
  • Gemini 3.1 Flash LiveGoogle
    93%
    32%
  • Phonic v1Phonic
    97%
    14%
  • Realtime 2.1 MiniOpenAI
    84%
    4%
  • Nova 2 SonicAmazon
    80%
    6%
  • Cascade, GPT-4.1Not ranked
    97%
    83%
Each model's share of calls that passed every check, on each suite.

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%7th

GPT-Live 1 + Sol low, 25.6 points higher

Success rate

Calls that passed every check.

GPT-Live 1 + Sol low
83.7%2nd
Nova 2 Sonic
59.3%8th

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%7th

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%8th

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%8th
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
4.897th
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
2.02s4th
Nova 2 Sonic
2.18s6th

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

MedianTo p90
Medianp90
  • Phonic v1Phonic
    Phonic v1: median 1.59s, p90 1.86s
    1.59s1.86s
  • Grok Think Fast 2.0xAI
    Grok Think Fast 2.0: median 1.62s, p90 1.94s
    1.62s1.94s
  • GPT Realtime 2.1OpenAI
    GPT Realtime 2.1: median 1.94s, p90 2.46s
    1.94s2.46s
  • GPT-Live 1 + Sol lowOpenAI
    GPT-Live 1 + Sol low: median 2.02s, p90 2.42s
    2.02s2.42s
  • Realtime 2.1 MiniOpenAI
    Realtime 2.1 Mini: median 2.08s, p90 2.75s
    2.08s2.75s
  • Nova 2 SonicAmazon
    Nova 2 Sonic: median 2.18s, p90 2.76s
    2.18s2.76s
  • Gemini 3.8 Live ThinkingGoogle
    Gemini 3.8 Live Thinking: median 2.32s, p90 3.06s
    2.32s3.06s
  • Gemini 3.1 Flash LiveGoogle
    Gemini 3.1 Flash Live: median 2.88s, p90 4.00s
    2.88s4.00s
  • Cascade, GPT-4.1Not ranked
    Cascade, GPT-4.1: median 2.17s, p90 2.51s
    2.17s2.51s
2.0s3.0s4.0s
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 the short form, run after run.
  • Every failure is in the saved record; the conversation itself always reaches the outcome.
  • On the long form it routes the caller wrong or skips a step.
  • Says goodbye without hanging up, and stalls more than any other model.
  • Lowest voice score of the field.
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

  • Misses caller names and phone numbers: blank or wrong.
  • Long forms rarely pass; more scenarios fail every run than for any other model.
  • Repeats the same tool call more than any other model.
  • Best voice score of the field, and the longest replies.
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.
See the full leaderboardReference agent

Related comparisons

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) passed 62 of 82 scenarios on all three runs, and Amazon Nova 2 Sonic passed 41. GPT-Live 1 + GPT-6 Sol (low thinking) is ahead, by 25.6 points.

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) 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.

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

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 costs less, 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.

How were GPT-Live 1 + GPT-6 Sol (low thinking) and Amazon Nova 2 Sonic compared?

Both ran as the whole agent in the same open-source Pipecat pipeline, with the same prompt, tools and phone line. A simulated caller worked through all 82 scenarios on live calls, three times each, 2,214 calls across the benchmark. A call passes only when the agent said the right things and saved the right data.