PyAI vs Cartesia · as of June 2026
PyAI vs Cartesia
Cartesia is a strong pick when raw time-to-first-audio is the only metric. PyAI Speak sits in the same sub-100ms in-region class and wins on a full phone-agent stack plus predictable per-minute billing, not a clean latency win.
PyAI
Win on full-stack agent economics and emotional long-form Cast workflows, not just TTS latency.
Cartesia
Public pricing as of June 2026.
TL;DR
- Same sub-100ms first-byte class. We do not claim a clean win over Cartesia
- Speak $0.04/min, Cast $0.02/min, Omni $0.05/min speech + brain
- Predictable per-minute billing instead of character or credit math
- Choose Cartesia when lowest published TTS time-to-first-audio is the only criterion
How much does PyAI cost vs Cartesia?
PyAI: Cast at $0.02/min; Omni speech + brain at $0.05/min; Agents Live Beta at $0.08/min; managed telephony $0.01/min.
| PyAI | Cartesia | |
|---|---|---|
| TTS latency | ~53 ms warm first byte, in-region. Same fast class, not a ranking. | Sonic 82-100 ms vendor self-claim, network-included (verify) |
| TTS billing | $0.04/min per minute, no credit math | Character or credit based. No public per-character list we treat as firm. |
| Voice agent | $0.05/min speech + brain plus $0.01/min telephony | Line is a near-tie on Omni-class all-in. Do not read a clean price win. |
| When they win | Full phone-agent stack plus Cast long-form under one bill | Raw TTS time-to-first-audio as the only buying criterion |
PyAI latency is an in-region early measurement, not an SLA.
How fast is PyAI vs Cartesia?
PyAI Speak returns first audio in ~53 ms warm in-region, first audio byte, not first spoken word. A cloned voice is ~32 ms warm. Same sub-100ms class. We do not claim a clean win over Cartesia.
Methodology and test conditions live on the benchmarks page. Every published latency number is in-region.
Why teams pick PyAI over Cartesia
Expressive voice built for production, with direction and rights included.
Snappy realtime or rich long-form
Speak streams its first audio byte in ~53 ms warm (in-region) for live use - and a cloned voice in ~32 ms; Cast handles emotional long-form for podcasts, narration, and audiobooks.
Direction, not just generation
Guide emotion, pacing, and performance with free Voice Designer and free voice cloning - design brand and character voices without studio overhead.
Commercial rights included
Cast ships with commercial rights and is billed by the minute, so there's no credit math and no character counting.
Part of the whole voice stack
The same platform powers phone agents, transcription, and compliance - one account, one bill, not a single-purpose TTS vendor.
The chart
Time-to-first-audio-byte, the sub-100ms class
Lower is better. PyAI in teal. Not a ranking, figures are measured under different conditions.
PyAI Speak is an in-region, warm-path, first-audio-byte measurement; competitor figures are vendor self-claims (model-only or network-included) under their own conditions, as of June 2026. No neutral third-party benchmark exists, same fast class, verify in-region. How we measure.
When Cartesia is the better pick
Cartesia is a strong pick when lowest TTS time-to-first-audio is the only criterion.
Choose PyAI when teams that want narration and production phone agents under one bill.
FAQ
How much does PyAI cost vs Cartesia?
PyAI: Cast at $0.02/min; Omni speech + brain at $0.05/min; Agents Live Beta at $0.08/min; managed telephony $0.01/min. Cartesia: TTS is character/credit based; agent products are separately metered per minute. Public comparison data should be verified before procurement decisions.
How fast is PyAI vs Cartesia?
PyAI Speak returns first audio in ~53 ms warm in-region, first audio byte, not first spoken word. A cloned voice is ~32 ms warm. Same sub-100ms class. We do not claim a clean win over Cartesia.
When should I choose PyAI over Cartesia?
Teams that want narration and production phone agents under one bill.
When is Cartesia the better pick?
Cartesia is a strong pick when lowest TTS time-to-first-audio is the only criterion.
How do I test a replacement without a risky rewrite?
Start with one call path, use a PyAI test key and free credits, replay real calls, and compare quality, latency, completion rate, and all-in cost before routing production traffic.
One voice stack. One bill. Built for phone agents.
Start with $50 in free credit. No card.