2 models compared on the same benchmark — accuracy, latency, price, language coverage and capabilities. GPT-4o Transcribe Diarize leads on raw accuracy; Rev AI Reverb covers the most languages; Rev AI Reverb is cheapest.
Verdict · who wins what
Most accurate
GPT-4o Transcribe Diarize
19.7% WER
OpenAI
Fastest
—
—
Most languages
Rev AI Reverb
20 languages
Rev AI
Cheapest
Rev AI Reverb
$0.0030/min
Rev AI
Comparing
2 models · same benchmark
1
GPT-4o Transcribe Diarize
OpenAI
GPT-4o transcription with built-in speaker diarization
2
Rev AI Reverb
Rev AI
Rev AI Reverb — async speech-to-text built on Rev's Reverb ASR model (trained on 3M+ hours of human-transcribed audio), with speaker diarization for up to 8 speakers and word-level timestamps. English-core with broad language support via the async API.
30-day benchmark average
overall WER vs price
GPT-4o Transcribe Diarize
Rev AI Reverb
field · 26 models
lower-left is better
WER · lower is better
WER · English
p50 → p99
Streaming benchmark averages
Rolling 30 days
billed per second
Feature support
Languages · formats · regions
general
legal
medical
noisy
technical
uk
us
Latency p99
18.1s
13.9s
$18.00
1,000 hours
$360.00
$180.00
No
Auto-detect language
Yes
No
Live / streaming
No
No
Custom vocabulary
No
No
Compliance
—
Is GPT-4o Transcribe Diarize or Rev AI Reverb more accurate?
GPT-4o Transcribe Diarize is more accurate, with a 19.7% word error rate versus 21.5% for Rev AI Reverb, on our standardized benchmark.
Which is cheaper, GPT-4o Transcribe Diarize or Rev AI Reverb?
Rev AI Reverb is cheaper at $0.0030/min versus $0.0060/min for GPT-4o Transcribe Diarize.
Should you choose GPT-4o Transcribe Diarize or Rev AI Reverb?
Choose GPT-4o Transcribe Diarize for accuracy; choose Rev AI Reverb for lower cost and language coverage.
