CekuraBench

Gemini 3.8 FlashvsGemini 3.1 Flash

Gemini 3.8 FlashGemini 3.1 Flash
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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 Flash1.29 s · 87.7%
  • Gemini 3.1 Flash1.16 s · 87.7%

Gemini 3.8 Flash is better on naturalness and price. Gemini 3.1 Flash is better on non-streaming latency.

Last updated Methodology by Dileep Chagam

Which is better at what

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

MeasureGemini 3.8 FlashGemini 3.1 Flash
  • Non-streaming latency (median)Gemini 3.1 Flash is better1.29 s1.16 s
  • Streaming latency (median)Can't streamCan't stream
  • Extra audio after a stopNo stop messageNo stop message
  • Hard parts read rightLevel87.7%87.7%
  • Naturalness (1 to 5)Gemini 3.8 Flash is better4.464.32
  • Price per 1M charactersGemini 3.8 Flash is better$28.66$86.16
Hard parts read rightGemini 3.8 FlashGemini 3.1 Flash
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.84%83%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019982%85%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor98%98%
  • 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

MeasureGemini 3.8 FlashGemini 3.1 Flash
  • Non-streaming latency (median)25 of 2624 of 26
  • Streaming latency (median)n/an/a
  • Extra audio after a stopn/an/a
  • Hard parts read right6 of 266 of 26
  • Naturalness (1 to 5)6 of 2623 of 26
  • Price per 1M characters12 of 2524 of 25

Related comparisons

Gemini 3.8 Flash vs Gemini 3.1 Flash FAQ

  • Gemini 3.1 Flash. Gemini 3.8 Flash: 1.29 s. Gemini 3.1 Flash: 1.16 s.

  • Neither has a figure. Gemini 3.8 Flash: Can't stream. Gemini 3.1 Flash: Can't stream.

  • Neither has a figure. Gemini 3.8 Flash: No stop message. Gemini 3.1 Flash: No stop message.

  • They are level. Gemini 3.8 Flash: 87.7%. Gemini 3.1 Flash: 87.7%.

  • Gemini 3.8 Flash. Gemini 3.8 Flash: $28.66. Gemini 3.1 Flash: $86.16.