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 8GPT Realtime · ranked 5 of 8
Gemini Live vs GPT Realtime
GPT Realtime is ahead of Gemini Live on repeatable reliability, task completion, infrastructure reliability, tool call accuracy, interruption handling and response time.
Last updated Methodology by Luis Ojeda
Verdict
Which to pick
GPT Realtime is the better pick over Gemini Live on every measure that separates them: reliability across repeated runs (34.14 points higher), completing the caller's task (4.88 points higher), calls that connect and stay up (23.17 points higher), accurate tool calls (0.39 higher), handling interruptions (0.01 higher) and fast replies (1.47s faster).
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
- GPT Realtime
- 64.63%5th
GPT Realtime, 34.14 points higher
Task completion
Calls where the expected outcome was fully reached.
- Gemini Live
- 87.80%8th
- GPT Realtime
- 92.68%6th
GPT Realtime, 4.88 points higher
Infrastructure-clean calls
Calls with no connection, audio or platform failure.
- Gemini Live
- 72.36%8th
- GPT Realtime
- 95.53%6th
GPT Realtime, 23.17 points higher
Tool call accuracy
Mean score for calling the right tool with the right arguments.
- Gemini Live
- 4.40/57th
- GPT Realtime
- 4.79/52nd
GPT Realtime, 0.39 higher
Voice tone and clarity
Mean score for how clear and natural the agent sounds.
- Gemini Live
- Not scored
- GPT Realtime
- 4.25/54th
Not comparable
Interruption handling
Mean score for yielding and recovering when the caller cuts in.
- Gemini Live
- 4.97/53rd
- GPT Realtime
- 4.98/52nd
GPT Realtime, 0.01 higher
Mean response time
Mean time for the agent to start replying after the caller stops.
- Gemini Live
- 3.05s7th
- GPT Realtime
- 1.58s2nd
GPT Realtime, 1.47s faster
246 calls per platform: 82 scenarios, 3 runs each.
On the calls
What each platform ran, and what we saw
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
Frequently asked questions
Is Gemini Live or GPT Realtime more reliable?
GPT Realtime is more reliable, by 34.14 points. Gemini Live passed 30.49% of the 82 scenarios on all 3 runs and GPT Realtime passed 64.63%. A scenario only counts when every run of it passed.
Which responds faster, Gemini Live or GPT Realtime?
GPT Realtime starts replying sooner, 1.47s faster. Mean response time is 3.05s for Gemini Live and 1.58s for GPT Realtime.
Which completes more calls, Gemini Live or GPT Realtime?
Gemini Live reached the expected outcome on 87.80% of calls and GPT Realtime on 92.68%. GPT Realtime is ahead on task completion.
How were Gemini Live and GPT Realtime 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.