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Deepgram FluxvsAssemblyAI TTS 1

Deepgram FluxAssemblyAI TTS 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
  • Deepgram Flux194 ms · 77.4%
  • AssemblyAI TTS 1171 ms · 81.5%

Deepgram Flux is better on streaming latency. AssemblyAI TTS 1 is better on non-streaming latency, stopping, accuracy, naturalness and price.

Last updated Methodology by Dileep Chagam

Which is better at what

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

MeasureDeepgram FluxAssemblyAI TTS 1
  • Non-streaming latency (median)AssemblyAI TTS 1 is better194 ms171 ms
  • Streaming latency (median)Deepgram Flux is better154 ms159 ms
  • Extra audio after a stopAssemblyAI TTS 1 is better80 ms40 ms
  • Hard parts read rightAssemblyAI TTS 1 is better77.4%81.5%
  • Naturalness (1 to 5)AssemblyAI TTS 1 is better4.164.50
  • Price per 1M charactersAssemblyAI TTS 1 is better$45.00$15.00
Hard parts read rightDeepgram FluxAssemblyAI TTS 1
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.72%74%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019981%92%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor69%71%
  • Medical termslevothyroxine · gastroenterology97%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 27

MeasureDeepgram FluxAssemblyAI TTS 1
  • Non-streaming latency (median)7 of 274 of 27
  • Streaming latency (median)6 of 198 of 19
  • Extra audio after a stop5 of 73 of 7
  • Hard parts read right20 of 2714 of 27
  • Naturalness (1 to 5)27 of 274 of 27
  • Price per 1M characters22 of 262 of 26

Related comparisons

Deepgram Flux vs AssemblyAI TTS 1 FAQ

  • AssemblyAI TTS 1. Deepgram Flux: 194 ms. AssemblyAI TTS 1: 171 ms.

  • Deepgram Flux. Deepgram Flux: 154 ms. AssemblyAI TTS 1: 159 ms.

  • AssemblyAI TTS 1. Deepgram Flux: 80 ms. AssemblyAI TTS 1: 40 ms.

  • AssemblyAI TTS 1. Deepgram Flux: 77.4%. AssemblyAI TTS 1: 81.5%.

  • AssemblyAI TTS 1. Deepgram Flux: $45.00. AssemblyAI TTS 1: $15.00.

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