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How Retell uses Cartesia

2-3x

“Cartesia’s Time-to-First-Audio (TTFA) is 2-3x faster than the next best provider on Retell’s platform.”

As published on cartesia.ai, November 2025. Captured by usedby on Oct 8, 2026.

What happened

Retell AI, a no-code platform for LLM-powered voice agents used in call centers, uses Cartesia's text-to-speech as a primary voice provider and as an automatic failover. Retell customers can enable Cartesia voices on their agents with a single API call.

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

  • <0.1%“Cartesia maintains a <0.1% error rate on Retell’s platform.”
  • 99.9%“Enterprise reliability 99.9% uptime.”

Cartesia’s Time-to-First-Audio (TTFA) is 2-3x faster than the next best provider on Retell’s platform. For voice agents, this translates to conversations that feel natural rather than stilted - critical for maintaining engagement in high-stakes calls.

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

It’s incredibly difficult to achieve the rare blend of latency, reliability, accuracy, and voice quality. Cartesia managed to do all four, which is why customers adopted them faster than any other voice model we’ve introduced.

Zexia Zhang, CTO of Retell AI, Retell. 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: 2-3xCheckedPrinted word for word on the page, near the name of Retell.
  • The passage quoted aboveCheckedCopied word for word from the page, near the name of Retell.
  • The publication dateCheckedRead from the page’s own metadata, never guessed.
  • Retell 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 Cartesia99.99%Uptime with enterprise-grade reliabilityReplicant uses Cartesia. Another customer of Cartesia70%“saw a 70% reduction in costs for one position”AimAI uses Cartesia. Another customer of Cartesia