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Gemini 3.1 Flash Live Preview vs GPT Realtime 2.1 Mini

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Gemini 3.1 Flash Live PreviewGoogle
Wins 9 of 11
Reliability (Pass³)
34.3%
Latency P50
3.06s
Cost per Minute (USD)
$0.070
GPT Realtime 2.1 MiniOpenAI
Wins 2 of 11
Reliability (Pass³)
14.3%
Latency P50
2.40s
Cost per Minute (USD)
$0.020

Gemini 3.1 Flash Live Preview is ahead on ELO rating, hearing score, turn taking score, speaking score, task handling score, reliability, calls handled well, calls fully resolved and calls where the agent went quiet, and GPT Realtime 2.1 Mini on median latency and cost.

Last updated Methodology by Dileep Chagam

Who is better at what

Gemini 3.1 Flash Live PreviewGPT Realtime 2.1 Mini
  • ELO Rating1062921
  • Hearing6854
  • Turn Taking7974
  • Speaking8071
  • Task Handling7765
  • Reliability (Pass³)34.3%14.3%
  • Pass Rate (score ≥ 80)58.6%39.5%
  • Task Completion Rate24.8%13.8%
  • Dead-Air Rate (≥ 10 s)7.6%9.0%
  • Latency P503.06s2.40s
  • Cost per Minute (USD)$0.070$0.020

Results by call

Right every time, on booking and Healthcare calls

Banking callsHealthcare calls
  1. 29%
    40%
    Gemini 3.1 Flash Live Preview
  2. 9%
    20%
    GPT Realtime 2.1 Mini

Related Comparisons

Each model on its own: Gemini 3.1 Flash Live Preview and GPT Realtime 2.1 Mini

Gemini 3.1 Flash Live Preview vs GPT Realtime 2.1 Mini FAQ

  • Gemini 3.1 Flash Live Preview is more reliable, by 20.0 points. Gemini 3.1 Flash Live Preview handled 24 of 70 real callers well on all three runs, and GPT Realtime 2.1 Mini 10. A caller only counts when every run of the call scored 80 or more.

  • For a voice agent, Gemini 3.1 Flash Live Preview, since it handles more real callers well on every run. Gemini 3.1 Flash Live Preview is ahead on ELO rating, hearing score, turn taking score, speaking score, task handling score, reliability, calls handled well, calls fully resolved and calls where the agent went quiet, and GPT Realtime 2.1 Mini on median latency and cost.

  • Gemini 3.1 Flash Live Preview, by 11.0 points higher. Gemini 3.1 Flash Live Preview fully resolved 24.8% of calls and GPT Realtime 2.1 Mini 13.8%. A call counts only when every step the caller needed was done.

  • No. GPT Realtime 2.1 Mini starts replying 0.66s sooner at the median. Gemini 3.1 Flash Live Preview takes 3.06s at the median and 3.86s at p90; GPT Realtime 2.1 Mini takes 2.40s and 2.88s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.

  • Gemini 3.1 Flash Live Preview, by 1.4 points. The agent went quiet for 10 seconds or more on 7.6% of Gemini 3.1 Flash Live Preview calls and 9.0% of GPT Realtime 2.1 Mini calls.

  • GPT Realtime 2.1 Mini is $0.050 cheaper a minute. Gemini 3.1 Flash Live Preview costs $0.070 a minute of call and GPT Realtime 2.1 Mini $0.020, at each vendor's published rates.

  • Cekura ran both as the whole agent with the same prompt, tools and phone connection. Both took the same 70 recorded real human callers on live calls, three times each. Each call is graded on 25 skills across Hearing, Turn Taking, Task Handling and Speaking, and passes at a score of 80 out of 100.

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