2 models compared on the same benchmark — accuracy, latency, price, language coverage and capabilities. GPT-4o Transcribe Diarize leads on raw accuracy; GPT-4o Transcribe Diarize is fastest; Nova-3 covers the most languages; GPT-4o Transcribe Diarize is cheapest.
Verdict · who wins what
Most accurate
GPT-4o Transcribe Diarize
19.7% WER
OpenAI
Fastest
GPT-4o Transcribe Diarize
0.2× realtime
OpenAI
Most languages
Nova-3
47 languages
Deepgram
Cheapest
GPT-4o Transcribe Diarize
$0.0060/min
OpenAI
Comparing
2 models · same benchmark
1
Nova-3
Deepgram
Deepgram's flagship model — 53% lower WER vs competitors, code-switching support
2
GPT-4o Transcribe Diarize
OpenAI
GPT-4o transcription with built-in speaker diarization
30-day benchmark average
overall WER vs price
GPT-4o Transcribe Diarize
Nova-3
field · 23 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
1.6s
18.1s
1.02×
—
Flicker
83.5%
—
Cadence
0.8/s
—
$36.00
1,000 hours
$460.80
$360.00
No
Auto-detect language
Yes
Yes
Live / streaming
Yes
No
Custom vocabulary
Yes
No
Compliance
Is Nova-3 or GPT-4o Transcribe Diarize more accurate?
GPT-4o Transcribe Diarize is more accurate, with a 19.7% word error rate versus 36.8% for Nova-3, on our standardized benchmark.
Which is cheaper, Nova-3 or GPT-4o Transcribe Diarize?
GPT-4o Transcribe Diarize is cheaper at $0.0060/min versus $0.0077/min for Nova-3.
Should you choose Nova-3 or GPT-4o Transcribe Diarize?
Choose Nova-3 for language coverage; choose GPT-4o Transcribe Diarize for accuracy, speed, and lower cost.
