CekuraBench

Gemini 3.8 Flash-LitevsGrok TTS

Gemini 3.8 Flash-LiteGrok TTS
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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
  • Gemini 3.8 Flash-Lite729 ms · 88.6%
  • Grok TTS358 ms · 87.4%

Gemini 3.8 Flash-Lite is better on accuracy and naturalness. Grok TTS is better on non-streaming latency, streaming latency, stopping and price.

Last updated Methodology by Dileep Chagam

Which is better at what

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

MeasureGemini 3.8 Flash-LiteGrok TTS
  • Non-streaming latency (median)Grok TTS is better729 ms358 ms
  • Streaming latency (median)Grok TTS is betterCan't stream157 ms
  • Extra audio after a stopGrok TTS is betterNo stop message0 ms
  • Hard parts read rightGemini 3.8 Flash-Lite is better88.6%87.4%
  • Naturalness (1 to 5)Gemini 3.8 Flash-Lite is better4.344.17
  • Price per 1M charactersGrok TTS is better$19.03$15.00
Hard parts read rightGemini 3.8 Flash-LiteGrok TTS
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.85%82%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019985%86%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor98%100%
  • Medical termslevothyroxine · gastroenterology99%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

MeasureGemini 3.8 Flash-LiteGrok TTS
  • Non-streaming latency (median)22 of 2618 of 26
  • Streaming latency (median)n/a7 of 18
  • Extra audio after a stopn/a1 of 6
  • Hard parts read right5 of 268 of 26
  • Naturalness (1 to 5)19 of 2625 of 26
  • Price per 1M characters6 of 252 of 25

Related comparisons

Gemini 3.8 Flash-Lite vs Grok TTS FAQ

  • Grok TTS. Gemini 3.8 Flash-Lite: 729 ms. Grok TTS: 358 ms.

  • Grok TTS. Gemini 3.8 Flash-Lite: Can't stream. Grok TTS: 157 ms.

  • Grok TTS. Gemini 3.8 Flash-Lite: No stop message. Grok TTS: 0 ms.

  • Gemini 3.8 Flash-Lite. Gemini 3.8 Flash-Lite: 88.6%. Grok TTS: 87.4%.

  • Grok TTS. Gemini 3.8 Flash-Lite: $19.03. Grok TTS: $15.00.