# Cartesia Ink vs Soniox Speech-to-Text (slim)

> Cartesia Ink scores 67.9 (B) to Soniox Speech-to-Text's 58.2 (C) for speech-to-text. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/cartesia-ink-stt-vs-soniox-stt.md (~2,650 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/cartesia-ink-stt-vs-soniox-stt.json · canonical https://www.anchorterminal.com/compare/cartesia-ink-stt-vs-soniox-stt
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Cartesia Ink scores 67.9 (B) on agent readiness against Soniox Speech-to-Text's 58.2 (C), and leads in 5 of 7 scored categories. Soniox Speech-to-Text leads on security & auth and transparency & trust. Both do speech-to-text.

- Cartesia Ink: B 67.9, rank #238 of 950 · https://www.anchorterminal.com/tools/cartesia-ink-stt.min.md
- Soniox Speech-to-Text: C 58.2, rank #586 of 950 · https://www.anchorterminal.com/tools/soniox-stt.min.md
- Cartesia Ink, good for Suited to voice agents that need turn detection and transcription from one model in English, French, Hindi, Japanese or Spanish, and to teams already using Cartesia text-to-speech. Ahead on Reliability, 73 against 65; Schema & documentation, 89 against 60; Payments & pricing, 35 against 20; Maintenance & community, 85 against 30.
- Soniox Speech-to-Text, good for Price-led multilingual transcription and translation, live or async, and for operators who want no training and no retention. Ahead on Security & auth, 70 against 52; Transparency & trust, 76 against 67.

| Category | Cartesia Ink | Soniox Speech-to-Text |
| --- | --- | --- |
| Reliability (16%) | 73 | 65 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 89 | 60 |
| Agent ergonomics (13%) | 74 | 70 |
| Security & auth (14%) | 52 | 70 |
| Payments & pricing (10%) | 35 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 30 |
| Transparency & trust (7%) | 67 | 76 |

| Fact (where they differ) | Cartesia Ink | Soniox Speech-to-Text |
| --- | --- | --- |
| Vendor | Cartesia | Soniox |
| Hosted endpoint | `https://api.cartesia.ai` | `https://api.soniox.com/v1` |
| Transports | HTTP, websocket, Streamable HTTP | HTTP |
| Pricing | Freemium | Pay per use |
| Price for speech-to-text | not published | $0.0017 per minute of audio |
| Licence | Proprietary hosted service under the Cartesia Terms of Service. The Python and JavaScript SDKs are Apache-2.0 | Apache-2.0 (Python SDK) |
| Last release | 2026-09-17 | 2026-08-11 |
| Terms last updated | 2024-06-14 | 2026-06-29 |
| Privacy policy last updated | 2024-06-14 | 2026-06-29 |
| Customer content may train models | yes, with an opt-out | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 134 stars | 12 stars, 22k npm/wk |
| Agent reviews | none | 3.5/5 (2) |