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GooglePhonic

Gemini 3.1 Flash Live Preview vs Phonic v1

Phonic v1 is ahead on reliability, success rate, agent responses, stalled calls and response time, and Gemini 3.1 Flash Live Preview on data accuracy, interruption and cost.

Last updated Methodology by Dileep Chagam

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Success rate by suite

Higher is better
Appointments59 scenariosMedicare23 scenarios
  • Phonic v1Phonic
    97%
    26%
  • Gemini 3.1 Flash LiveGoogle
    93%
    32%
Each model's share of calls that passed every check, on each suite.
Verdict

Which to pick

Pick Gemini 3.1 Flash Live Preview for saving the caller's data correctly (1.8 points higher), handling interruptions (0.09 higher) and lower cost ($0.070 cheaper). Pick Phonic v1 for reliability across repeated calls (6.1 points higher), calls that pass every check (1.2 points higher), getting the agent's replies right (2.0 points higher), fewer stalled calls (3.3 points lower) and fast replies (1.28s sooner).

Every metric, side by side

Reliability

Scenarios that passed on all three runs.

Gemini 3.1 Flash Live
62.2%6th
Phonic v1
68.3%4th

Phonic v1, 6.1 points higher

Success rate

Calls that passed every check.

Gemini 3.1 Flash Live
76.0%5th
Phonic v1
77.2%4th

Phonic v1, 1.2 points higher

Agent responses

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

Gemini 3.1 Flash Live
95.9%6th
Phonic v1
98.0%4th

Phonic v1, 2.0 points higher

Data accuracy

Calls where everything the agent saved matched exactly.

Gemini 3.1 Flash Live
79.2%5th
Phonic v1
77.4%7th

Gemini 3.1 Flash Live, 1.8 points higher

Stalled calls

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

Gemini 3.1 Flash Live
3.3%6th
Phonic v1
0.0%1st

Phonic v1, 3.3 points lower

Interruption

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

Gemini 3.1 Flash Live
4.985th
Phonic v1
4.8911th

Gemini 3.1 Flash Live, 0.09 higher

Response time

Median time to start replying after the caller finishes.

Gemini 3.1 Flash Live
2.88s11th
Phonic v1
1.60s1st

Phonic v1, 1.28s sooner

Cost / min

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

Gemini 3.1 Flash Live
$0.0703rd
Phonic v1
$0.1408th

Gemini 3.1 Flash Live, $0.070 cheaper

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

Phonic v1 answers first

Phonic v1 1.60s, Gemini 3.1 Flash Live 2.88s at the median.

Response time, median to p90

Lower is betterMedianTo p90
Medianp90
  • Phonic v1Phonic
    Phonic v1: median 1.60s, p90 1.88s
    1.60s1.88s
  • Gemini 3.1 Flash LiveGoogle
    Gemini 3.1 Flash Live: median 2.88s, p90 4.00s
    2.88s4.00s
2.0s3.0s4.0s
Seconds from the caller finishing to the agent starting to reply, per model.

What we saw on the calls

Gemini 3.1 Flash Live Preview

  • Reliable on bookings.
All 3 notes on Gemini 3.1 Flash Live
Model
models/gemini-3.1-flash-live-preview
Setting
Thinking level high
Voice
Charon
Turn taking
Shared local turn detection
Audio
16 kHz
Cost
Averaged over the calls with a usage record.

Phonic v1

  • Quickest to reply, and never left a caller waiting.
All 4 notes on Phonic v1
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.
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Frequently asked questions

Is Gemini 3.1 Flash Live Preview or Phonic v1 more reliable?

Phonic v1 is more reliable, by 6.1 points. Gemini 3.1 Flash Live Preview passed 51 of 82 scenarios on all three runs, and Phonic v1 passed 56. A scenario only counts when every run of it passed.

Which should I pick, Gemini 3.1 Flash Live Preview or Phonic v1?

For a phone agent, Phonic v1, since it gets more scenarios right on every run. Phonic v1 is ahead on reliability, success rate, agent responses, stalled calls and response time, and Gemini 3.1 Flash Live Preview on data accuracy, interruption and cost.

Which saves caller data more accurately, Gemini 3.1 Flash Live Preview or Phonic v1?

Gemini 3.1 Flash Live Preview, by 1.8 points. Gemini 3.1 Flash Live Preview saved everything exactly right on 79.2% of the calls that save data, and Phonic v1 on 77.4%. On Appointments, 96.5% against 98.2%. On Medicare, 34.8% against 25.0%. A call counts only when nothing is missing, wrong, extra or saved twice.

Is Gemini 3.1 Flash Live Preview faster than Phonic v1?

No. Phonic v1 starts replying 1.28s sooner at the median. Gemini 3.1 Flash Live Preview takes 2.88s at the median and 4.00s 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 handles interruptions better, Gemini 3.1 Flash Live Preview or Phonic v1?

Gemini 3.1 Flash Live Preview, by 0.09 on a 0 to 5 scale. Gemini 3.1 Flash Live Preview scores 4.98 and Phonic v1 4.89 for how well the agent handled being talked over.

Which goes silent on callers less often, Gemini 3.1 Flash Live Preview or Phonic v1?

Phonic v1, by 3.3 points. The agent went silent for 10 seconds or more on 3.3% of Gemini 3.1 Flash Live Preview calls and 0.0% of Phonic v1 calls.

Which is cheaper, Gemini 3.1 Flash Live Preview or Phonic v1?

Gemini 3.1 Flash Live Preview is $0.070 cheaper a minute. Gemini 3.1 Flash Live Preview costs $0.070 a minute of call and Phonic v1 $0.140, at each vendor's published rates.

Where does the Gemini 3.1 Flash Live Preview vs Phonic v1 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.