Cartesia vs Hume AI
Cartesia rates higher than both Hume Octave models, generates speech faster, and costs less.
ServiceNow, Decagon, and Quora run their production voice agents on Cartesia. One model, 44 languages, first audio in under 90ms, running inside your own network when you need it.
Voice quality
Cartesia rates higher than both Octave models
- The Provider Voice Arena rates every model on its own voices, so a voice roster counts alongside the model that speaks it.
- Hume sells Octave on emotional intelligence and natural-sounding speech. Sonic 3.6 rates above both Octave models on a blind listening test, and it is first on the Artificial Analysis Controlled Voice Arena, which gives every model the same voices.
Provider Voice Arena Elo
Higher is better
Speed
Cartesia generates nearly three times as fast as either Octave model
- Artificial Analysis measures generation speed for every model on the board, so both sides are timed by the same harness.
- That headroom over playback is what keeps a long turn from stalling mid-sentence, and it holds whichever Octave model you call.
Characters per second
Higher is better
Price
Cartesia costs less per character than either Octave model
- Artificial Analysis prices every model on the board the same way, per million characters of text.
- The cheaper model here is also the one listeners rate higher, so the saving does not come out of quality.
Price per 1M characters
USD, lower is better
Reasons why companies choose Cartesia over Hume AI
Human-like naturalness
Intonation, pacing, pronunciation, emotion, and audio quality that drive higher completion rates
Cartesia1282 EloHume AI1057 EloOctave 21029 EloOctave TTSAugust 2026
Latency
Decides whether it feels like a conversation or a phone tree.
Cartesia<90ms to first audioHume AI~100msOctave 2 preview~200msOctave TTSLanguages
Comprehension and trust across a global customer base.
Cartesia44 languages from one modelHume AI11 languagesOctave 2 previewEnglish and SpanishOctave TTSCustom voices
How much audio it takes, and who is allowed to use one.
CartesiaInstant clone from 10 seconds, professional clone from 30 minutes, on the public APIHume AICloning on every plan, with API access to a cloned voice on their Enterprise planDeployment
Decides whether regulated teams can use it at all.
CartesiaVPC, on-prem, on-device, or air-gapped, behind a 99.9% uptime SLAHume AIA cloud API, with SOC 2 Type II, GDPR, and HIPAA on their Enterprise planEnd-to-end stack
How many vendors it takes to run one call.
CartesiaTTS, STT, and Agents from one vendor, on one API. The only provider ranked first on both speech and transcriptionHume AIText to speech and a speech-to-speech voice interface
Frequently asked questions
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