GPT Realtime
- Strength
- Second-fastest response at 1.58s with 95.53% infrastructure-clean calls.
- What can be improved
- In a noisy-audio run, a long pause was followed by lost digits and a skipped tool action.
Speech-to-speech setup
- gpt-realtime-2.1
All platform comparisons
GPT Realtime · ranked 5 of 8LiveKit · ranked 2 of 8
GPT Realtime vs LiveKit
LiveKit is ahead on repeatable reliability, task completion, infrastructure reliability and voice tone and clarity, and GPT Realtime on tool call accuracy, interruption handling and response time.
Last updated Methodology by Luis Ojeda
Verdict
Which to pick
Pick GPT Realtime for accurate tool calls (0.12 higher), handling interruptions (0.01 higher) and fast replies (1.01s faster). Pick LiveKit for reliability across repeated runs (6.10 points higher), completing the caller's task (2.44 points higher), calls that connect and stay up (3.66 points higher) and how the agent sounds (0.11 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.
- GPT Realtime
- 64.63%5th
- LiveKit
- 70.73%2nd
LiveKit, 6.10 points higher
Task completion
Calls where the expected outcome was fully reached.
- GPT Realtime
- 92.68%6th
- LiveKit
- 95.12%3rd
LiveKit, 2.44 points higher
Infrastructure-clean calls
Calls with no connection, audio or platform failure.
- GPT Realtime
- 95.53%6th
- LiveKit
- 99.19%3rd
LiveKit, 3.66 points higher
Tool call accuracy
Mean score for calling the right tool with the right arguments.
- GPT Realtime
- 4.79/52nd
- LiveKit
- 4.67/54th
GPT Realtime, 0.12 higher
Voice tone and clarity
Mean score for how clear and natural the agent sounds.
- GPT Realtime
- 4.25/54th
- LiveKit
- 4.36/52nd
LiveKit, 0.11 higher
Interruption handling
Mean score for yielding and recovering when the caller cuts in.
- GPT Realtime
- 4.98/52nd
- LiveKit
- 4.97/53rd
GPT Realtime, 0.01 higher
Mean response time
Mean time for the agent to start replying after the caller stops.
- GPT Realtime
- 1.58s2nd
- LiveKit
- 2.59s6th
GPT Realtime, 1.01s faster
246 calls per platform: 82 scenarios, 3 runs each.
On the calls
What each platform ran, and what we saw
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
Frequently asked questions
Is GPT Realtime or LiveKit more reliable?
LiveKit is more reliable, by 6.10 points. GPT Realtime passed 64.63% of the 82 scenarios on all 3 runs and LiveKit passed 70.73%. A scenario only counts when every run of it passed.
Which responds faster, GPT Realtime or LiveKit?
GPT Realtime starts replying sooner, 1.01s faster. Mean response time is 1.58s for GPT Realtime and 2.59s for LiveKit.
Which completes more calls, GPT Realtime or LiveKit?
GPT Realtime reached the expected outcome on 92.68% of calls and LiveKit on 95.12%. LiveKit is ahead on task completion.
How were GPT Realtime and LiveKit 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.