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; GPT-4o Transcribe Diarize covers the most languages; Nova-2 Phone Call is cheapest.
Verdict · who wins what
Most accurate
GPT-4o Transcribe Diarize
14.6% WER
OpenAI
Fastest
GPT-4o Transcribe Diarize
0.2× realtime
OpenAI
Most languages
GPT-4o Transcribe Diarize
12 languages
OpenAI
Cheapest
Nova-2 Phone Call
$0.0058/min
Deepgram
Comparing
2 models · same benchmark
1
Nova-2 Phone Call
Deepgram
Optimized for low-bandwidth phone call audio
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-2 Phone Call
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
1.8s
18.1s
Final drain
192ms
—
Real-time factor
1.02×
—
Flicker
9.0%
—
Cadence
0.8/s
—
$34.92
$36.00
1,000 hours
$349.20
$360.00
No
Auto-detect language
No
Yes
Live / streaming
Yes
No
Custom vocabulary
Yes
No
Compliance
Is Nova-2 Phone Call or GPT-4o Transcribe Diarize more accurate?
GPT-4o Transcribe Diarize is more accurate, with a 14.6% word error rate versus 16.4% for Nova-2 Phone Call, on our standardized benchmark.
Which is cheaper, Nova-2 Phone Call or GPT-4o Transcribe Diarize?
Nova-2 Phone Call is cheaper at $0.0058/min versus $0.0060/min for GPT-4o Transcribe Diarize.
Should you choose Nova-2 Phone Call or GPT-4o Transcribe Diarize?
Choose Nova-2 Phone Call for lower cost; choose GPT-4o Transcribe Diarize for accuracy, speed, and language coverage.
