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GPT Realtime vs Smallest AI

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GPT Realtime is ahead on repeatable reliability, tool call accuracy, interruption handling and response time, and Smallest AI on task completion, infrastructure reliability and voice tone and clarity.

GPT Realtime ranked 6 of 10 · Smallest AI ranked 9 of 10

Last updated Methodology by Luis Ojeda

Which to pick

Pick GPT Realtime for reliability across repeated runs (8.53 points higher), accurate tool calls (0.21 higher), handling interruptions (0.07 higher) and fast replies (1.14s faster). Pick Smallest AI for completing the caller's task (1.63 points higher), calls that connect and stay up (0.81 points higher) and how the agent sounds (0.12 higher).

Every metric, side by side

Bars share one scale across all 10 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%6th
Smallest AI
56.10%9th

GPT Realtime, 8.53 points higher

Task completion

Calls where the expected outcome was fully reached.

GPT Realtime
92.68%8th
Smallest AI
94.31%5th

Smallest AI, 1.63 points higher

Infrastructure-clean calls

Calls with no connection, audio or platform failure.

GPT Realtime
95.53%8th
Smallest AI
96.34%7th

Smallest AI, 0.81 points higher

Tool call accuracy

Mean score for calling the right tool with the right arguments.

GPT Realtime
4.79/53rd
Smallest AI
4.58/56th

GPT Realtime, 0.21 higher

Voice tone and clarity

Mean score for how clear and natural the agent sounds.

GPT Realtime
4.25/55th
Smallest AI
4.37/52nd

Smallest AI, 0.12 higher

Interruption handling

Mean score for yielding and recovering when the caller cuts in.

GPT Realtime
4.98/53rd
Smallest AI
4.91/58th

GPT Realtime, 0.07 higher

Mean response time

Mean time for the agent to start replying after the caller stops.

GPT Realtime
1.58s2nd
Smallest AI
2.71s8th

GPT Realtime, 1.14s faster

246 calls per platform: 82 scenarios, 3 runs each.

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
Open example All GPT Realtime calls

Smallest AI

Strength
94.31% task completion across all 246 calls, and 62.71% pass³ on the Appointment suite (37 of 59 scenarios).
What can be improved
Atoms tool parameters cannot be arrays, so Medicare list arguments arrive as comma-separated text; its tool accuracy reads that text as a list. With the standard check it scores 45.12% pass³.
STT, LLM and TTS
  • pulse
  • electron
  • waves_lightning_v3_1_pro (chelsea)
Open example All Smallest AI calls

Related comparisons

GPT Realtime vs Smallest AI FAQ

  • GPT Realtime is more reliable, by 8.53 points. GPT Realtime passed 64.63% of the 82 scenarios on all 3 runs and Smallest AI passed 56.10%. A scenario only counts when every run of it passed.

  • GPT Realtime starts replying sooner, 1.14s faster. Mean response time is 1.58s for GPT Realtime and 2.71s for Smallest AI.

  • GPT Realtime reached the expected outcome on 92.68% of calls and Smallest AI on 94.31%. Smallest AI is ahead on task completion.

  • 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.

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