2 models compared on the same benchmark — accuracy, latency, price, language coverage and capabilities. Soniox STT (Async) leads on raw accuracy; GPT-4o Transcribe Diarize is fastest; Soniox STT (Async) covers the most languages; Soniox STT (Async) is cheapest.
Verdict · who wins what
Most accurate
Soniox STT (Async)
8.7% WER
Soniox
Fastest
GPT-4o Transcribe Diarize
0.2× realtime
OpenAI
Most languages
Soniox STT (Async)
25 languages
Soniox
Cheapest
Soniox STT (Async)
$0.0017/min
Soniox
Comparing
2 models · same benchmark
1
GPT-4o Transcribe Diarize
OpenAI
GPT-4o transcription with built-in speaker diarization
2
Soniox STT (Async)
Soniox
Soniox async batch transcription — one multilingual model across 60+ languages with speaker diarization, per-word timestamps, and automatic language identification, at a low flat token-based rate.
GPT-4o Transcribe Diarize
Soniox STT (Async)
field · 33 models
lower-left is better
general
legal
medical
noisy
technical
uk
us
Latency p99
18.1s
6.2s
$10.08
1,000 hours
$360.00
$100.80
No
Auto-detect language
Yes
Yes
Live / streaming
No
No
Custom vocabulary
No
No
Max file size
25 MB
No limit
Max duration
No limit
5 h
Compliance
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Is GPT-4o Transcribe Diarize or Soniox STT (Async) more accurate?
Soniox STT (Async) is more accurate, with a 8.7% word error rate versus 14.6% for GPT-4o Transcribe Diarize, on our standardized benchmark.
Which is cheaper, GPT-4o Transcribe Diarize or Soniox STT (Async)?
Soniox STT (Async) is cheaper at $0.0017/min versus $0.0060/min for GPT-4o Transcribe Diarize.
Should you choose GPT-4o Transcribe Diarize or Soniox STT (Async)?
Choose GPT-4o Transcribe Diarize for speed; choose Soniox STT (Async) for accuracy, lower cost, and language coverage.
