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Cartesia Sonic

Ultra-low latency TTS model designed for realtime conversational experiences.

verifiedRecently verifiedSource: manual
Health medium (34)

Best for

  • • Realtime call assistants and interactive voice bots.

Limitations

  • • Expressive long-form narration is weaker than studio-grade TTS stacks.
  • • Best quality requires stable audio playback pipeline.

Use carefully when

  • • High-fidelity audiobook narration with broad style control.

Quickstart

  1. Tune chunked streaming and jitter buffering for your target network.

Setup checklist

  • • API key required: Yes
  • • SDK quality: medium
  • • Self-host difficulty: easy

Health Meter

  • • Setup complexity: 42
  • • Safety & misuse risk: 38
  • • License/compliance risk: 18

• Good baseline for controlled deployment.

Capabilities

  • realtimeStreamingtrue
  • avgTurnLatencyMs180
  • voiceCloningfalse
  • multilingualtrue

Benchmarks

latencyP95Ms
260
conversationalNaturalness
80.7
bargeInRecovery
85.2

Community reviews

1 reviews • avg 4

Fast realtime audio

★ 4

Excellent for interactive voice bot flows, not ideal for long narration quality.

Samples

Call assistant

Instant response travel booking bot

Last verified: 23/2/2026, 3:45:28 am • Source: https://openrouter.ai/rankings
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