Which should you pick?
Cartesia Sonic 3.6 costs 4 credits (headline rate) and Inworld TTS 2 Flash costs 2 credits (headline rate). One of the two does not publish what a full job costs, only a headline rate, so these two figures are not a like-for-like price comparison.
What a job costs
Cartesia Sonic 3.6
4 credits (headline rate)
It bills per 1,000 characters of input text.
- per 1,000 characters4 credits
Inworld TTS 2 Flash
2 credits (headline rate)
It bills per 1,000 characters of input text.
- per 1,000 characters2 credits
All figures are Versely credits. Your plan's credit allowance is on the pricing page.
Spec comparison
| Spec | Cartesia Sonic 3.6 | Inworld TTS 2 Flash |
|---|---|---|
| Provider | Cartesia | Inworld |
| Cost per job | 4 credits (headline rate) | 2 credits (headline rate) |
| Billing | per 1,000 characters of input text | per 1,000 characters of input text |
| Max resolution | — | — |
| Aspect ratios | — | — |
| Durations | — | — |
| Frame rates | — | — |
| Qualities | — | — |
| Requires starting image | No | No |
| Accepts video input | No | No |
| Reference images | — | — |
| Leaderboard | Unranked | Unranked |
| Released | Aug 26, 2026 | Sep 1, 2026 |
What each one does that the other doesn't
Only Cartesia Sonic 3.6
emotion control, speed control, high quality, top ranked
Only Inworld TTS 2 Flash
fast, low latency, 200+ languages, value
Both list: text to audio, voice clone, text to speech, multilingual, voice clone.
Full Cartesia Sonic 3.6 spec sheet →
Cartesia's newest and top-ranked TTS model (Sonic 3.6). 44 languages including Hindi-English code-switching, context-driven emotion without tags, speed tuning, and voice cloning. Existing cloned voices work unchanged.
Full Inworld TTS 2 Flash spec sheet →
Inworld Realtime TTS-2 Flash: the low-latency tier of TTS-2, around five times faster to first audio and 40% cheaper, with the same 200+ languages and voice cloning. Best for high-volume and conversational use.
Frequently asked questions
Which is cheaper, Cartesia Sonic 3.6 or Inworld TTS 2 Flash?+
They are not directly comparable on price: Cartesia Sonic 3.6 costs 4 credits (headline rate) and Inworld TTS 2 Flash costs 2 credits (headline rate), and one of those is a headline rate rather than the cost of a complete job.
What can Cartesia Sonic 3.6 do that Inworld TTS 2 Flash can't, or vice versa?+
Only Cartesia Sonic 3.6 lists emotion control, speed control, high quality, top ranked. Only Inworld TTS 2 Flash lists fast, low latency, 200+ languages, value. Both list text to audio, voice clone, text to speech, multilingual, voice clone.
How do Cartesia Sonic 3.6 and Inworld TTS 2 Flash bill?+
Cartesia Sonic 3.6 bills per 1,000 characters of input text. Inworld TTS 2 Flash bills per 1,000 characters of input text. Both are charged in Versely credits.
Try both inside Versely
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