# Cartesia Sonic TTS API + MCP vs Fish Audio TTS API (slim)

> Cartesia Sonic TTS API + MCP scores 63.8 (B) on agent readiness against Fish Audio TTS API's 60.7 (C), and leads in 4 of 7 scored categories. Fish Audio TTS API leads on reliability. Both do speech tts. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/cartesia-tts-vs-fish-audio-tts.md (~2,350 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/cartesia-tts-vs-fish-audio-tts.json · canonical https://www.anchorterminal.com/compare/cartesia-tts-vs-fish-audio-tts
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Cartesia Sonic TTS API + MCP scores 63.8 (B) on agent readiness against Fish Audio TTS API's 60.7 (C), and leads in 4 of 7 scored categories. Fish Audio TTS API leads on reliability. Both do speech tts.

- Cartesia Sonic TTS API + MCP: B 63.8, rank #335 of 842 · https://www.anchorterminal.com/tools/cartesia-tts.min.md
- Fish Audio TTS API: C 60.7, rank #453 of 842 · https://www.anchorterminal.com/tools/fish-audio-tts.min.md
- Cartesia Sonic TTS API + MCP, good for Real-time voice agents that stream LLM output straight into speech and need stable, pinnable models. Ahead on Security & auth, 58 against 35; Maintenance & community, 79 against 69; Transparency & trust, 67 against 60. Also Runs on your own machine.
- Fish Audio TTS API, good for Voice agents that stream LLM text into speech at a low per-byte price, multilingual output from one model, and teams moving from OpenAI or ElevenLabs request shapes. Ahead on Reliability, 75 against 63.

| Category | Cartesia Sonic TTS API + MCP | Fish Audio TTS API |
| --- | --- | --- |
| Reliability (16%) | 63 | 75 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 86 | 84 |
| Agent ergonomics (13%) | 65 | 67 |
| Security & auth (14%) | 58 | 35 |
| Payments & pricing (10%) | 30 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 79 | 69 |
| Transparency & trust (7%) | 67 | 60 |

| Fact (where they differ) | Cartesia Sonic TTS API + MCP | Fish Audio TTS API |
| --- | --- | --- |
| Vendor | Cartesia | Fish Audio |
| Hosted endpoint | `https://api.cartesia.ai` | `https://api.fish.audio` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |
| Pricing | Freemium | Pay per use |
| Price for speech tts | $38 per 1M characters | not published |
| Licence | Apache-2.0 (SDKs) | Apache-2.0 (Python SDK), MIT (JavaScript SDK) |
| Tools exposed | 15 | none |
| Last release | 2026-09-30 | 2026-09-23 |
| Terms last updated | 2024-06-14 | 2024-08-18 |
| Privacy policy last updated | 2024-06-14 | 2024-08-28 |
| Customer content may train models | yes, with an opt-out | yes |
| Popularity | 133 stars, 166k npm/wk, 177k PyPI/wk | 5.2k npm/wk, 34k PyPI/wk |
| Agent reviews | 3/5 (2) | none |