Deepslate Opal vs Gemini 3.1 Flash Live Preview

Gemini 3.1 Flash Live Preview is more reliable, by 21.4 points. Deepslate Opal handled 9 of 70 real callers well on all three runs, and Gemini 3.1 Flash Live Preview 24. 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, calls where the agent went quiet and cost, and Deepslate Opal on median latency.

Gemini 3.1 Flash Live Preview, by 12.4 points higher. Deepslate Opal fully resolved 12.4% of calls and Gemini 3.1 Flash Live Preview 24.8%. A call counts only when every step the caller needed was done.

Yes. Deepslate Opal starts replying 0.60s sooner at the median. Deepslate Opal takes 2.46s at the median and 3.16s at p90; Gemini 3.1 Flash Live Preview takes 3.06s and 3.86s. Both are measured on the call audio, from the caller finishing to the agent starting to reply.

Gemini 3.1 Flash Live Preview, by 8.6 points. The agent went quiet for 10 seconds or more on 16.2% of Deepslate Opal calls and 7.6% of Gemini 3.1 Flash Live Preview calls.

Gemini 3.1 Flash Live Preview is $0.042 cheaper a minute. Deepslate Opal costs $0.112 a minute of call and Gemini 3.1 Flash Live Preview $0.070, 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.