2 models compared on the same benchmark — accuracy, latency, price, language coverage and capabilities. Gladia Solaria-3 leads on raw accuracy; GPT-4o Transcribe Diarize covers the most languages; GPT-4o Transcribe Diarize is cheapest.
Verdict · who wins what
Most accurate
Gladia Solaria-3
10.6% WER
Gladia
Fastest
—
—
Most languages
GPT-4o Transcribe Diarize
12 languages
OpenAI
Cheapest
GPT-4o Transcribe Diarize
$0.0060/min
OpenAI
Comparing
2 models · same benchmark
1
Gladia Solaria-3
Gladia
Gladia Solaria-3 — EU-hosted batch speech-to-text tuned for the most accurate business audio across five core European languages (English, French, German, Spanish, Italian), with speaker diarization, custom vocabulary, and word-level timestamps.
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
Gladia Solaria-3
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
7.7s
18.1s
$36.00
1,000 hours
$608.40
$360.00
No
Auto-detect language
Yes
Yes
Live / streaming
No
No
Custom vocabulary
Yes
No
Compliance
Is Gladia Solaria-3 or GPT-4o Transcribe Diarize more accurate?
Gladia Solaria-3 is more accurate, with a 10.6% word error rate versus 19.7% for GPT-4o Transcribe Diarize, on our standardized benchmark.
Which is cheaper, Gladia Solaria-3 or GPT-4o Transcribe Diarize?
GPT-4o Transcribe Diarize is cheaper at $0.0060/min versus $0.0101/min for Gladia Solaria-3.
Should you choose Gladia Solaria-3 or GPT-4o Transcribe Diarize?
Choose Gladia Solaria-3 for accuracy; choose GPT-4o Transcribe Diarize for lower cost and language coverage.
