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How Goodcall uses Cartesia

90 ms

“Goodcall achieves a 90 ms on average for time-to-first-audio”

As published on cartesia.ai, October 2024. Captured by usedby on Oct 8, 2026.

What happened

Goodcall runs an AI phone agent for reception, sales and service, and uses Cartesia's Sonic text-to-speech to generate the voices for its agents. It moved all of its text-to-speech generation from ElevenLabs to Cartesia.

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

  • 97%“consistently hit 97% interaction rate”
  • 2,217“Goodcall has switched 100% of their text-to-speech generation for 2,217 unique voice agents from Eleven Labs to Cartesia.”

Industry-Leading Latency: With Sonic, Goodcall achieves a 90 ms on average for time-to-first-audio, including both model and network latency, which is more than four times as fast as the performance experienced with Eleven Labs.

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

I became an early adopter of Cartesia the day they launched as soon as I saw how low their latency was.

Bob Summers, CEO & Founder of Goodcall, Goodcall. 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 figure: 90 msCheckedPrinted word for word on the page, near the name of Goodcall.
  • The passage quoted aboveCheckedCopied word for word from the page, near the name of Goodcall.
  • The publication dateCheckedRead from the page’s own metadata, never guessed.
  • Goodcall uses CartesiaCheckedConfirmed line. Latest check across sources: Oct 8, 2026.
  • The result itselfNot checkedWe quote it; we did not measure it.

Same company, same tool or same industry.

97%“97% faster resolutions and nearly 2x CSAT scores achieved for customers”Lorikeet uses Cartesia. Another customer of Cartesia2-3x“Cartesia’s Time-to-First-Audio (TTFA) is 2-3x faster than the next best provider on Retell’s platform.”Retell uses Cartesia. Another customer of Cartesia99.99%Uptime with enterprise-grade reliabilityReplicant uses Cartesia. Another customer of Cartesia