Gemini Live
- Strength
- Second-highest repetition score at 4.78/5 across 174 scored calls.
- What can be improved
- One rerun had no latency evidence and scored 0/5 for both task outcome and tool accuracy.
Speech-to-speech setup
- reasoning: high
- hybrid VAD
All platform comparisons
Gemini Live · ranked 8 of 8Vapi · ranked 7 of 8
Gemini Live vs Vapi
Gemini Live is ahead on tool call accuracy, interruption handling and response time, and Vapi on repeatable reliability, task completion and infrastructure reliability.
Last updated Methodology by Luis Ojeda
Verdict
Which to pick
Pick Gemini Live for accurate tool calls (0.38 higher), handling interruptions (0.24 higher) and fast replies (0.03s faster). Pick Vapi for reliability across repeated runs (29.27 points higher), completing the caller's task (9.76 points higher) and calls that connect and stay up (10.57 points higher).
Head to head
Every metric, side by side
Bars share one scale across all 8 platforms. The place next to each figure is its rank in the field.
Repeatable reliability
Share of the 82 scenarios that passed on all three runs.
- Gemini Live
- 30.49%8th
- Vapi
- 59.76%7th
Vapi, 29.27 points higher
Task completion
Calls where the expected outcome was fully reached.
- Gemini Live
- 87.80%8th
- Vapi
- 97.56%1st
Vapi, 9.76 points higher
Infrastructure-clean calls
Calls with no connection, audio or platform failure.
- Gemini Live
- 72.36%8th
- Vapi
- 82.93%7th
Vapi, 10.57 points higher
Tool call accuracy
Mean score for calling the right tool with the right arguments.
- Gemini Live
- 4.40/57th
- Vapi
- 4.02/58th
Gemini Live, 0.38 higher
Voice tone and clarity
Mean score for how clear and natural the agent sounds.
- Gemini Live
- Not scored
- Vapi
- 4.08/56th
Not comparable
Interruption handling
Mean score for yielding and recovering when the caller cuts in.
- Gemini Live
- 4.97/53rd
- Vapi
- 4.73/57th
Gemini Live, 0.24 higher
Mean response time
Mean time for the agent to start replying after the caller stops.
- Gemini Live
- 3.05s7th
- Vapi
- 3.08s8th
Gemini Live, 0.03s faster
246 calls per platform: 82 scenarios, 3 runs each.
On the calls
What each platform ran, and what we saw
Vapi
- Strength
- Tied for first in task completion at 97.56% across 205 calls with outcome evidence.
- What can be improved
- The remaining 41 of 246 calls did not connect and remain visible in infrastructure reliability.
STT, LLM and TTS
- stt-rt-v5
- gpt-4.1-2025-04-14
- vapi-v2 (Clara)
Frequently asked questions
Is Gemini Live or Vapi more reliable?
Vapi is more reliable, by 29.27 points. Gemini Live passed 30.49% of the 82 scenarios on all 3 runs and Vapi passed 59.76%. A scenario only counts when every run of it passed.
Which responds faster, Gemini Live or Vapi?
Gemini Live starts replying sooner, 0.03s faster. Mean response time is 3.05s for Gemini Live and 3.08s for Vapi.
Which completes more calls, Gemini Live or Vapi?
Gemini Live reached the expected outcome on 87.80% of calls and Vapi on 97.56%. Vapi is ahead on task completion.
How were Gemini Live and Vapi tested?
Both ran the same Appointment and Medicare agents through the same 82 caller scenarios, 3 times each, with the same evaluators and mock tools. Only the platform and its speech and model components changed.