CekuraBench

ElevenLabs Flash v2.5vsElevenLabs v4

ElevenLabs Flash v2.5ElevenLabs v4
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
  • ElevenLabs Flash v2.5182 ms · 64.4%
  • ElevenLabs v4678 ms · 80.4%

ElevenLabs Flash v2.5 is better on non-streaming latency, streaming latency and price. ElevenLabs v4 is better on accuracy and naturalness.

Last updated Methodology by Dileep Chagam

Which is better at what

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

MeasureElevenLabs Flash v2.5ElevenLabs v4
  • Non-streaming latency (median)ElevenLabs Flash v2.5 is better182 ms678 ms
  • Streaming latency (median)ElevenLabs Flash v2.5 is better177 ms561 ms
  • Extra audio after a stopFinishes firstFinishes first
  • Hard parts read rightElevenLabs v4 is better64.4%80.4%
  • Naturalness (1 to 5)ElevenLabs v4 is better4.334.42
  • Price per 1M charactersElevenLabs Flash v2.5 is better$40.00$80.00
Hard parts read rightElevenLabs Flash v2.5ElevenLabs v4
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.55%72%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019955%83%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor75%88%
  • Medical termslevothyroxine · gastroenterology100%100%

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

MeasureElevenLabs Flash v2.5ElevenLabs v4
  • Non-streaming latency (median)5 of 2620 of 26
  • Streaming latency (median)8 of 1817 of 18
  • Extra audio after a stopn/an/a
  • Hard parts read right26 of 2615 of 26
  • Naturalness (1 to 5)21 of 269 of 26
  • Price per 1M characters18 of 2523 of 25

Related comparisons

ElevenLabs Flash v2.5 vs ElevenLabs v4 FAQ

  • ElevenLabs Flash v2.5. ElevenLabs Flash v2.5: 182 ms. ElevenLabs v4: 678 ms.

  • ElevenLabs Flash v2.5. ElevenLabs Flash v2.5: 177 ms. ElevenLabs v4: 561 ms.

  • Neither has a figure. ElevenLabs Flash v2.5: Finishes first. ElevenLabs v4: Finishes first.

  • ElevenLabs v4. ElevenLabs Flash v2.5: 64.4%. ElevenLabs v4: 80.4%.

  • ElevenLabs Flash v2.5. ElevenLabs Flash v2.5: $40.00. ElevenLabs v4: $80.00.