CekuraBench

GPT-4o mini TTSvsHume Octave 2

GPT-4o mini TTSHume Octave 2
Compare

Speed and accuracy

Left is faster. Higher reads more hard parts right.

Fast and accurate60%70%80%90%100%00.5s1s1.5s2sTime until the caller hears the voice
  • GPT-4o mini TTS688 ms · 82.7%
  • Hume Octave 2582 ms · 87.4%

GPT-4o mini TTS is better on naturalness and price. Hume Octave 2 is better on non-streaming latency, streaming latency and accuracy.

Last updated Methodology by Dileep Chagam

Which is better at what

Measure by measure, the same sentences, the same place.

MeasureGPT-4o mini TTSHume Octave 2
  • Non-streaming latency (median)Hume Octave 2 is better688 ms582 ms
  • Streaming latency (median)Hume Octave 2 is betterCan't stream573 ms
  • Extra audio after a stopNo stop messageNo stop message
  • Hard parts read rightHume Octave 2 is better82.7%87.4%
  • Naturalness (1 to 5)GPT-4o mini TTS is better4.434.38
  • Price per 1M charactersGPT-4o mini TTS is better$25.70$100.00
Hard parts read rightGPT-4o mini TTSHume Octave 2
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.78%87%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019978%71%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor96%100%
  • Medical termslevothyroxine · gastroenterology94%99%

An estimate: speech-to-text transcribers scored it, not people.

Hear both

The same sentence, read by each voice.

19 sentences, the same for both
  1. 01A greetingThanks for calling Cedar Valley Family Practice, this is Riley. How can I help you today?
  2. 02MoneyYour current balance is $1,347.09.
  3. 03A dateThe order was placed on 2026-03-14 and shipped two days later.
  4. 04Tracking codeThe tracking number is 1Z 7A4 X29 0341 8867.
  5. 05Email addressI have m.rivera88@example.org, is that still current?
  6. 06An Irish nameSiobhan Ó Briain called about the invoice.

How each ranks among all 26

MeasureGPT-4o mini TTSHume Octave 2
  • Non-streaming latency (median)21 of 2619 of 26
  • Streaming latency (median)n/a18 of 18
  • Extra audio after a stopn/an/a
  • Hard parts read right12 of 268 of 26
  • Naturalness (1 to 5)7 of 2616 of 26
  • Price per 1M characters11 of 2525 of 25

Related comparisons

GPT-4o mini TTS vs Hume Octave 2 FAQ

  • Hume Octave 2. GPT-4o mini TTS: 688 ms. Hume Octave 2: 582 ms.

  • Hume Octave 2. GPT-4o mini TTS: Can't stream. Hume Octave 2: 573 ms.

  • Neither has a figure. GPT-4o mini TTS: No stop message. Hume Octave 2: No stop message.

  • Hume Octave 2. GPT-4o mini TTS: 82.7%. Hume Octave 2: 87.4%.

  • GPT-4o mini TTS. GPT-4o mini TTS: $25.70. Hume Octave 2: $100.00.