Retell is ahead on repeatable reliability, infrastructure reliability, tool call accuracy, interruption handling and response time, and Smallest AI on task completion and voice tone and clarity.
Last updated Methodology by Luis Ojeda
Pick Retell for reliability across repeated runs (19.51 points higher), calls that connect and stay up (2.03 points higher), accurate tool calls (0.26 higher), handling interruptions (0.09 higher) and fast replies (0.51s faster). Pick Smallest AI for completing the caller's task (0.43 points higher) and how the agent sounds (0.01 higher).
Bars share one scale across all 10 platforms. The place next to each figure is its rank in the field.
Share of the 82 scenarios that passed on all three runs.
Retell, 19.51 points higher
Calls where the expected outcome was fully reached.
Smallest AI, 0.43 points higher
Calls with no connection, audio or platform failure.
Retell, 2.03 points higher
Mean score for calling the right tool with the right arguments.
Retell, 0.26 higher
Mean score for how clear and natural the agent sounds.
Smallest AI, 0.01 higher
Mean score for yielding and recovering when the caller cuts in.
Retell, 0.09 higher
Mean time for the agent to start replying after the caller stops.
Retell, 0.51s faster
246 calls per platform: 82 scenarios, 3 runs each.
Retell is more reliable, by 19.51 points. Retell passed 75.61% of the 82 scenarios on all 3 runs and Smallest AI passed 56.10%. A scenario only counts when every run of it passed.
Retell is more reliable, by 19.51 points. Retell passed 75.61% of the 82 scenarios on all 3 runs and Smallest AI passed 56.10%. A scenario only counts when every run of it passed.
Retell starts replying sooner, 0.51s faster. Mean response time is 2.21s for Retell and 2.71s for Smallest AI.
Retell reached the expected outcome on 93.88% 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.
Cekura runs these simulated calls on your agent and scores every one.
