CekuraBench

Hume Octave 2vsSmallest Lightning v3.1

Hume Octave 2Smallest Lightning v3.1
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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
  • Hume Octave 2582 ms · 87.4%
  • Smallest Lightning v3.1357 ms · 81.3%

Hume Octave 2 is better on accuracy. Smallest Lightning v3.1 is better on non-streaming latency, streaming latency, naturalness and price.

Last updated Methodology by Dileep Chagam

Which is better at what

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

MeasureHume Octave 2Smallest Lightning v3.1
  • Non-streaming latency (median)Smallest Lightning v3.1 is better582 ms357 ms
  • Streaming latency (median)Smallest Lightning v3.1 is better573 ms363 ms
  • Extra audio after a stopNo stop messageNo stop message
  • Hard parts read rightHume Octave 2 is better87.4%81.3%
  • Naturalness (1 to 5)Smallest Lightning v3.1 is better4.384.49
  • Price per 1M charactersSmallest Lightning v3.1 is better$100.00$19.50
Hard parts read rightHume Octave 2Smallest Lightning v3.1
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.87%78%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019971%81%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor100%75%
  • Medical termslevothyroxine · gastroenterology99%97%

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

MeasureHume Octave 2Smallest Lightning v3.1
  • Non-streaming latency (median)19 of 2617 of 26
  • Streaming latency (median)18 of 1816 of 18
  • Extra audio after a stopn/an/a
  • Hard parts read right8 of 2614 of 26
  • Naturalness (1 to 5)16 of 264 of 26
  • Price per 1M characters25 of 257 of 25

Related comparisons

Hume Octave 2 vs Smallest Lightning v3.1 FAQ

  • Smallest Lightning v3.1. Hume Octave 2: 582 ms. Smallest Lightning v3.1: 357 ms.

  • Smallest Lightning v3.1. Hume Octave 2: 573 ms. Smallest Lightning v3.1: 363 ms.

  • Neither has a figure. Hume Octave 2: No stop message. Smallest Lightning v3.1: No stop message.

  • Hume Octave 2. Hume Octave 2: 87.4%. Smallest Lightning v3.1: 81.3%.

  • Smallest Lightning v3.1. Hume Octave 2: $100.00. Smallest Lightning v3.1: $19.50.