CekuraBench
All comparisons
GooglePhonic

Gemini 3.8 Live vs Phonic v1

Phonic v1 is ahead on reliability, success rate, agent responses, data accuracy, stalled calls and response time, and Gemini 3.8 Live on interruption.

Compare

Success rate by suite

Appointments59 scenariosMedicare23 scenarios
  • GPT Realtime 2.1OpenAI
    92%
    81%
  • GPT-Live 1 + Sol lowOpenAI
    97%
    49%
  • Phonic v1Phonic
    97%
    26%
  • Gemini 3.8 Live ThinkingGoogle
    79%
    70%
  • Grok Think Fast 2.0xAI
    96%
    25%
  • Gemini 3.1 Flash LiveGoogle
    93%
    32%
  • Gemini 3.8 LiveGoogle
    76%
    52%
  • 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.

Gemini 3.8 Live
41.5%9th
Phonic v1
68.3%3rd

Phonic v1, 26.8 points higher

Success rate

Calls that passed every check.

Gemini 3.8 Live
69.1%7th
Phonic v1
77.2%3rd

Phonic v1, 8.1 points higher

Agent responses

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

Gemini 3.8 Live
94.3%6th
Phonic v1
98.0%3rd

Phonic v1, 3.7 points higher

Data accuracy

Calls where everything the agent saved matched exactly.

Gemini 3.8 Live
70.5%7th
Phonic v1
77.4%6th

Phonic v1, 6.9 points higher

Stalled calls

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

Gemini 3.8 Live
2.0%3rd
Phonic v1
0.0%1st

Phonic v1, 2.0 points lower

Interruption

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

Gemini 3.8 Live
4.983rd
Phonic v1
4.899th

Gemini 3.8 Live, 0.09 higher

Response time

Median time to start replying after the caller finishes.

Gemini 3.8 Live
1.91s3rd
Phonic v1
1.60s1st

Phonic v1, 0.30s sooner

Cost / min

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

Gemini 3.8 Live
No verified rate
Phonic v1
$0.1406th

Not comparable

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

Phonic v1 answers first

Phonic v1 1.60s, Gemini 3.8 Live 1.91s at the median.

Response time, median to p90

MedianTo p90
Medianp90
  • Phonic v1Phonic
    Phonic v1: median 1.60s, p90 1.88s
    1.60s1.88s
  • Grok Think Fast 2.0xAI
    Grok Think Fast 2.0: median 1.62s, p90 1.94s
    1.62s1.94s
  • Gemini 3.8 LiveGoogle
    Gemini 3.8 Live: median 1.91s, p90 2.23s
    1.91s2.23s
  • 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
  • Gemini 3.8 Live ThinkingGoogle
    Gemini 3.8 Live Thinking: median 2.07s, p90 2.74s
    2.07s2.74s
  • 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 3.1 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

Gemini 3.8 Live

  • Without extended thinking it replies sooner, and short-form calls reach the outcome more often.
  • On the long form the conversation still reaches the outcome, but the saved record is wrong far more often.
  • Weakest of the field when the caller corrects themselves.
  • Google's turn detection stalls it under background conversation: the caller finishes and no reply comes (AS50, AS52, AS14).
  • Least predictable of the field.
Model
gemini-3.8-live
Setting
No thinking level
Voice
Charon
Turn taking
Service turn detection
Audio
16 kHz
Cost
The export carries audio tokens but not text or cached input, so a per-call cost is not derived.

Phonic v1

  • Level with the best on the short form, run after run.
  • Quickest to reply, and never left the caller waiting.
  • Fails the long form's exact check, though the record would usually match.
  • Short-form slips are an extra tool call; it repeats calls more than most.
Model
phonic_v1
Setting
Intelligence high
Voice
sabrina
Turn taking
Service turn detection
Audio
16 kHz
Cost
The vendor's Starter plan rate per conversation minute, applied to each call's length; the Pro plan is $0.12.
See the full leaderboardReference agent

Related comparisons

Frequently asked questions

Is Gemini 3.8 Live or Phonic v1 more reliable?

Gemini 3.8 Live passed 34 of 82 scenarios on all three runs, and Phonic v1 passed 56. Phonic v1 is ahead, by 26.8 points.

Which saves caller data more accurately, Gemini 3.8 Live or Phonic v1?

Gemini 3.8 Live saved everything exactly right on 70.5% of the calls that save data, and Phonic v1 on 77.4%. On Appointments, 78.4% against 98.2%. On Medicare, 50.0% against 25.0%. A call counts only when nothing is missing, wrong, extra or saved twice.

Which responds faster, Gemini 3.8 Live or Phonic v1?

Phonic v1 starts replying 0.30s sooner at the median. Gemini 3.8 Live takes 1.91s at the median and 2.23s at p90; Phonic v1 takes 1.60s and 1.88s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.

Which costs less, Gemini 3.8 Live or Phonic v1?

There is no verified per-minute rate for Gemini 3.8 Live, so cost cannot be compared yet.

How were Gemini 3.8 Live and Phonic v1 compared?

Both ran 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, 2,460 calls across the benchmark. A call passes only when the agent said the right things and saved the right data.