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
All platform comparisons
GPT Realtime · ranked 5 of 8Telnyx · ranked 4 of 8
GPT Realtime vs Telnyx
GPT Realtime is ahead on tool call accuracy, voice tone and clarity, interruption handling and response time, and Telnyx on repeatable reliability, task completion and infrastructure reliability.
Last updated Methodology by Luis Ojeda
Verdict
Which to pick
Pick GPT Realtime for accurate tool calls (0.08 higher), how the agent sounds (0.04 higher), handling interruptions (0.35 higher) and fast replies (0.24s faster). Pick Telnyx for reliability across repeated runs (3.66 points higher), completing the caller's task (4.88 points higher) and calls that connect and stay up (4.47 points higher).
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.
- GPT Realtime
- 64.63%5th
- Telnyx
- 68.29%4th
Telnyx, 3.66 points higher
Task completion
Calls where the expected outcome was fully reached.
- GPT Realtime
- 92.68%6th
- Telnyx
- 97.56%1st
Telnyx, 4.88 points higher
Infrastructure-clean calls
Calls with no connection, audio or platform failure.
- GPT Realtime
- 95.53%6th
- Telnyx
- 100.00%1st
Telnyx, 4.47 points higher
Tool call accuracy
Mean score for calling the right tool with the right arguments.
- GPT Realtime
- 4.79/52nd
- Telnyx
- 4.71/53rd
GPT Realtime, 0.08 higher
Voice tone and clarity
Mean score for how clear and natural the agent sounds.
- GPT Realtime
- 4.25/54th
- Telnyx
- 4.21/55th
GPT Realtime, 0.04 higher
Interruption handling
Mean score for yielding and recovering when the caller cuts in.
- GPT Realtime
- 4.98/52nd
- Telnyx
- 4.63/58th
GPT Realtime, 0.35 higher
Mean response time
Mean time for the agent to start replying after the caller stops.
- GPT Realtime
- 1.58s2nd
- Telnyx
- 1.82s3rd
GPT Realtime, 0.24s faster
246 calls per platform: 82 scenarios, 3 runs each.
On the calls
What each platform ran, and what we saw
Telnyx
- Strength
- Tied for first in task completion at 97.56% across all 246 calls.
- What can be improved
- An opening interruption led the agent into plan discussion before completing the recording notice and TPMO disclosure.
STT, LLM and TTS
- deepgram/nova-3
- zai-org/GLM-5.2
- Telnyx Ultra
Frequently asked questions
Is GPT Realtime or Telnyx more reliable?
Telnyx is more reliable, by 3.66 points. GPT Realtime passed 64.63% of the 82 scenarios on all 3 runs and Telnyx passed 68.29%. A scenario only counts when every run of it passed.
Which responds faster, GPT Realtime or Telnyx?
GPT Realtime starts replying sooner, 0.24s faster. Mean response time is 1.58s for GPT Realtime and 1.82s for Telnyx.
Which completes more calls, GPT Realtime or Telnyx?
GPT Realtime reached the expected outcome on 92.68% of calls and Telnyx on 97.56%. Telnyx is ahead on task completion.
How were GPT Realtime and Telnyx 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.