2 models compared on the same benchmark — accuracy, latency, price, language coverage and capabilities. GPT-4o Transcribe Diarize leads on raw accuracy; Azure Speech is fastest; Azure Speech covers the most languages.
Verdict · who wins what
Most accurate
GPT-4o Transcribe Diarize
14.6% WER
OpenAI
Fastest
Azure Speech
0.3× realtime
Microsoft Azure
Most languages
Azure Speech
19 languages
Microsoft Azure
Cheapest
—
—
Comparing
2 models · same benchmark
1
Azure Speech
Microsoft Azure
Azure default STT model — 140+ languages, diarization, word timestamps
2
GPT-4o Transcribe Diarize
OpenAI
GPT-4o transcription with built-in speaker diarization
GPT-4o Transcribe Diarize
Azure Speech
field · 32 models
lower-left is better
general
legal
medical
noisy
technical
uk
us
Latency p99
2.0s
18.1s
Final drain
0ms
—
Real-time factor
1.01×
—
Flicker
13.2%
—
Cadence
1.7/s
—
$36.00
$36.00
1,000 hours
$360.00
$360.00
No
Auto-detect language
No
Yes
Live / streaming
Yes
No
Custom vocabulary
No
No
Max file size
1 GB
25 MB
Max duration
4 h
No limit
Compliance
Is Azure Speech or GPT-4o Transcribe Diarize more accurate?
GPT-4o Transcribe Diarize is more accurate, with a 14.6% word error rate versus 15.3% for Azure Speech, on our standardized benchmark.
Which is cheaper, Azure Speech or GPT-4o Transcribe Diarize?
Azure Speech and GPT-4o Transcribe Diarize cost the same at $0.0060/min.
Should you choose Azure Speech or GPT-4o Transcribe Diarize?
Choose Azure Speech for speed and language coverage; choose GPT-4o Transcribe Diarize for accuracy.
