LiveKit
- Strength
- Ranks second on repeatable reliability with 99.19% infrastructure-clean calls.
- What can be improved
- Consent was collected, but consent_id was omitted from the handoff tool.
STT, LLM and TTS
- nova-3
- openai/gpt-4.1
- sonic-3
All platform comparisons
LiveKit · ranked 2 of 8Vapi · ranked 7 of 8
LiveKit vs Vapi
LiveKit is ahead on repeatable reliability, infrastructure reliability, tool call accuracy, voice tone and clarity, interruption handling and response time, and Vapi on task completion.
Last updated Methodology by Luis Ojeda
Verdict
Which to pick
Pick LiveKit for reliability across repeated runs (10.97 points higher), calls that connect and stay up (16.26 points higher), accurate tool calls (0.65 higher), how the agent sounds (0.28 higher), handling interruptions (0.24 higher) and fast replies (0.49s faster). Pick Vapi for completing the caller's task (2.44 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.
- LiveKit
- 70.73%2nd
- Vapi
- 59.76%7th
LiveKit, 10.97 points higher
Task completion
Calls where the expected outcome was fully reached.
- LiveKit
- 95.12%3rd
- Vapi
- 97.56%1st
Vapi, 2.44 points higher
Infrastructure-clean calls
Calls with no connection, audio or platform failure.
- LiveKit
- 99.19%3rd
- Vapi
- 82.93%7th
LiveKit, 16.26 points higher
Tool call accuracy
Mean score for calling the right tool with the right arguments.
- LiveKit
- 4.67/54th
- Vapi
- 4.02/58th
LiveKit, 0.65 higher
Voice tone and clarity
Mean score for how clear and natural the agent sounds.
- LiveKit
- 4.36/52nd
- Vapi
- 4.08/56th
LiveKit, 0.28 higher
Interruption handling
Mean score for yielding and recovering when the caller cuts in.
- LiveKit
- 4.97/53rd
- Vapi
- 4.73/57th
LiveKit, 0.24 higher
Mean response time
Mean time for the agent to start replying after the caller stops.
- LiveKit
- 2.59s6th
- Vapi
- 3.08s8th
LiveKit, 0.49s 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 LiveKit or Vapi more reliable?
LiveKit is more reliable, by 10.97 points. LiveKit passed 70.73% 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, LiveKit or Vapi?
LiveKit starts replying sooner, 0.49s faster. Mean response time is 2.59s for LiveKit and 3.08s for Vapi.
Which completes more calls, LiveKit or Vapi?
LiveKit reached the expected outcome on 95.12% of calls and Vapi on 97.56%. Vapi is ahead on task completion.
How were LiveKit 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.