Measured on real phone calls, end to end with the agent: Ryffio replies sooner at the median than Vapi, Retell AI and ElevenLabs, costs less per minute and includes 25 concurrent calls.
Ryffio’s latency is our own measurement with the open-source Openbenchmarks analyzer; Vapi, Retell AI and ElevenLabs publish no end-to-end figure, so theirs are Openbenchmarks’ independent results. Ryffio is also ahead at the 95th percentile: 1,605 ms, against 1,768 for ElevenLabs, 2,008 for Vapi and 2,259 for Retell AI. Rates have different inclusions; see Ryffio pricing for every component.
Ryffio vs Vapi
Faster, cheaper, and roles included
Choose Ryffio for faster replies on the phone, a phone minute about a quarter cheaper, 25 included lines and team roles from day one. Choose Vapi when its broad provider catalog and developer ecosystem are your priority.
On the same end-to-end measure, Ryffio's median reply came 280 ms sooner than Vapi's (1,278 vs 1,558 ms) and its p95 403 ms sooner (1,605 vs 2,008 ms). Ryffio's platform fee is $0.03/min against Vapi's $0.05 hosting fee, and 25 concurrent calls are included where Vapi's usage plan includes 4. Admin, editor and viewer roles are included; Vapi lists roles from its Pro package, with a $999 monthly minimum.
Choose Ryffio for markedly faster replies, a lower minute price, more included lines and knowledge without a per-base fee. Choose Retell AI for its established telephony workflows and partner network.
On the same end-to-end measure, Ryffio's median reply came 462 ms sooner than Retell's (1,278 vs 1,740 ms) and its p95 654 ms sooner (1,605 vs 2,259 ms). Ryffio's platform fee is $0.03/min against Retell's $0.055 voice infrastructure, with 25 concurrent calls included against 20. Knowledge bases and retrieval are part of the platform; Retell charges $8 per knowledge base per month after the first ten, plus $0.005/min when one is used. Roles are included; Retell lists them in Enterprise.
Choose Ryffio for a faster median reply, a much lower minute price, per-assistant provider choice and 25 included lines without a plan upgrade. Choose ElevenAgents when ElevenLabs voices, cloning or its wider audio suite are central to your product.
On the same end-to-end measure, Ryffio's median reply came 146 ms sooner than ElevenAgents' (1,278 vs 1,424 ms) and its p95 163 ms sooner (1,605 vs 1,768 ms). Ryffio's cheapest phone minute is about $0.058 against about $0.091 for ElevenAgents' $0.08 rate plus model and carrier. 25 concurrent calls are included on every Ryffio account; ElevenAgents ties concurrency to its plan (4 free, 20 on Pro). Each Ryffio assistant chooses its own speech and voice providers.
Every Ryffio call runs on pipecat-rs, Ryffio’s Rust implementation of the Pipecat voice-agent framework: transport, voice activity detection, turn-taking, the model and voice streams, and paced audio. None of the three platforms publishes how its agent layer performs. We measured ours on one machine with the AI providers mocked, against open-source Python Pipecat running the same pipeline:
≥ 1,000 concurrent calls on one CPU core with no late audio, against 75 for Python Pipecat (≥ 13×).
0.17 MB of memory per call, against 1.17 MB, and 0.4 ms from transcript to first audio, against 1.9 ms.
A lighter runtime is what lets Ryffio charge $0.03 per minute and include 25 lines. Full method and caveats are in the benchmark’s results file.
Features all platforms share
All four platforms can support voice agents, knowledge, integrations and call analysis. Browser calling, outbound calls, testing and handoffs are not unique to Ryffio. The useful question is which combination of included controls, providers and purchase model fits your requirements.
Choose Ryffio if you want the fastest median reply on the phone, the lowest minute price, 25 included lines, workspace roles and knowledge retrieval, and a clear path from a small top-up to an enterprise evaluation. Discuss your requirements first if you need an uptime SLA, a particular carrier or residency outside the current US-East deployment.
How this comparison was built
Published by Ryffio. Last reviewed: .
Latency is the full pipeline with the agent: the gap from the moment the caller stops speaking to the agent's first audio, measured on real phone calls with the Openbenchmarks open-source analyzer (github.com/openbenchmarks-labs/voice-agent-latency) on a dual-channel Twilio carrier recording. Ryffio ran Openbenchmarks' Northwind support agent and question sets on a dedicated-CPU host in US East on 25 October 2026, with Gemini 3.5 Transcribe Live, Gemini 3.5 Flash-Lite, Fish Audio Drama 3 and a 0.2 s end-of-speech wait. Vapi, Retell AI and ElevenLabs publish no end-to-end figure of their own; their numbers are Openbenchmarks' independent measurements (leaderboard of 1 August 2026, about 400 turns each over Plivo, endpointing tuned down). Our sample is smaller and our carrier is Twilio. Cost per minute uses each platform's cheapest published configuration for a phone call, including a carrier: Ryffio with gpt-4o-mini-transcribe, Gemini 3.5 Flash-Lite and OpenAI TTS at the usage of a measured call (about 6,750 prompt tokens, 60 completion tokens and 270 spoken characters per minute), plus Twilio inbound at $0.0085/min. Agent-runtime capacity was measured on one machine with mocked AI providers against open-source Python Pipecat. Prices are in USD and exclude tax.
“Included” means no separate Ryffio feature subscription; the underlying model, speech, analysis and transport usage can still cost money. Feature availability, provider limits and commercial terms can change. Check the linked sources before purchasing.
Ryffio is the publisher of this comparison, not an independent reviewer. Our latency sample is smaller than Openbenchmarks’ (about 400 turns per platform), and differences under about 50 ms are within its error budget. We do not claim that shared features are exclusive. Test the same scenarios and models before moving traffic.
Test your workflow before you switch.
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