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How Speko uses Cartesia

As published on cartesia.ai, July 2026. Captured by usedby on Oct 8, 2026.

What happened

Speko runs a voice AI router that benchmarks speech-to-text, LLM, and text-to-speech models and routes each call to the best stack. Cartesia's Sonic 3.5 is one of the text-to-speech models it tracks, and it leads Speko's text-to-speech ranking and is its most frequent recommendation.

Summary written by usedby from the source page, in English. The figures are those of Cartesia and Speko, not ours.

Sonic 3.5 leads Speko’s overall text-to-speech ranking, with the strongest combination of speed and naturalness, and it holds up on price against the other models Speko tracks.

From the page. cartesia.ai, captured Oct 8, 2026

We are building an open router of voice AI basically. We are trying to be this neutral layer where we help people to pick the right model stack.

Beknazar Abdikamalov, Founder, Speko, Speko. Source, captured Oct 8, 2026

What the story claims, and what we checked

We compared the story with its live page on Oct 8, 2026.

  • The passage quoted aboveCheckedCopied word for word from the page, near the name of Speko.
  • The numbers in our summaryCheckedEach one is printed on the page.
  • The publication dateCheckedRead from the page’s own metadata, never guessed.
  • Speko uses CartesiaCheckedConfirmed line. Latest check across sources: Oct 8, 2026.
  • The result itselfNot checkedWe quote it; we did not measure it.

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