# Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Fish Audio TTS API > Deepgram Text-to-Speech (Aura-2, Flux TTS) scores 72.7 (BB) on agent readiness against Fish Audio TTS API's 60.7 (C), and leads in 6 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. - Canonical: https://www.anchorterminal.com/compare/deepgram-tts-vs-fish-audio-tts - Markdown: https://www.anchorterminal.com/compare/deepgram-tts-vs-fish-audio-tts.md (~2,500 tokens) - Slim: https://www.anchorterminal.com/compare/deepgram-tts-vs-fish-audio-tts.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/deepgram-tts-vs-fish-audio-tts.json (this page as data, same URL with Accept: application/json) - Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt) - API: https://www.anchorterminal.com/api/v1/index.json - Updated: 2026-10-09 Deepgram Text-to-Speech (Aura-2, Flux TTS) scores 72.7 (BB) on agent readiness against Fish Audio TTS API's 60.7 (C), and leads in 6 of 7 scored categories. Fish Audio TTS API leads on reliability. Both do speech tts. - Deepgram Text-to-Speech (Aura-2, Flux TTS): grade BB, 72.7/100, rank #97 of 842. Markdown https://www.anchorterminal.com/tools/deepgram-tts.md · JSON https://www.anchorterminal.com/api/v1/tools/deepgram-tts.json - Fish Audio TTS API: grade C, 60.7/100, rank #453 of 842. Markdown https://www.anchorterminal.com/tools/fish-audio-tts.md · JSON https://www.anchorterminal.com/api/v1/tools/fish-audio-tts.json ## Which one, for what ### Deepgram Text-to-Speech (Aura-2, Flux TTS) (BB) Good for: English voice agents that need clean barge-in handling and an operator who wants a typed spec and request logs. Ahead on: - Schema & documentation, 95 against 84 - Agent ergonomics, 82 against 67 - Security & auth, 70 against 35 - Payments & pricing, 40 against 30 - Transparency & trust, 72 against 60 Also in its favour: - Agent-ready, a grade of BB or better - Runs on your own machine - Free to start without a card Watch for: Requests can be kept for training unless each one sets `mip_opt_out=true` ### Fish Audio TTS API (C) 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 70 Watch for: The terms allow Usage Data and Content to train models, with no opt-out found ## Score by category | Category | Weight | Deepgram Text-to-Speech (Aura-2, Flux TTS) | Fish Audio TTS API | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 70 | 75 | Fish Audio TTS API +5 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 95 | 84 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +11 | | Agent ergonomics | 13% (16.2 this run) | 82 | 67 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +15 | | Security & auth | 14% (17.5 this run) | 70 | 35 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +35 | | Payments & pricing | 10% (12.5 this run) | 40 | 30 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +10 | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 73 | 69 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +4 | | Transparency & trust | 7% (8.8 this run) | 72 | 60 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +12 | | Negative events | ≤15 | 0 | 0 | | | **Total** | | **72.7 · BB** | **60.7 · C** | | ## Facts side by side | Fact | Deepgram Text-to-Speech (Aura-2, Flux TTS) | Fish Audio TTS API | | --- | --- | --- | | Kind | Model API | Model API | | Vendor | Deepgram | Fish Audio | | Hosted endpoint | `https://api.deepgram.com/v1` | `https://api.fish.audio` | | Transports | HTTP, Streamable HTTP, stdio, SSE (legacy) | HTTP, Streamable HTTP | | Auth | API key | OAuth or key | | Pricing | Pay per use | Pay per use | | Price for speech tts | $45 per 1M characters | not published | | x402 | no | no | | Licence | MIT (SDKs) | Apache-2.0 (Python SDK), MIT (JavaScript SDK) | | Read-only variant documented | no | no | | llms.txt | yes | yes | | Last release | 2026-09-29 | 2026-09-23 | | Terms last updated | 2026-08-06 | 2024-08-18 | | Privacy policy last updated | 2021-10-26 | 2024-08-28 | | Customer content may train models | yes, with an opt-out | yes | | Terms restrict automated access | not found in the text | yes | | Terms restrict benchmarking | yes | yes | | Terms or service can change without notice | yes | not found in the text | | Arbitration or class-action waiver | yes | yes | | Popularity | 468 stars, 1.1M npm/wk, 805k PyPI/wk | 5.2k npm/wk, 34k PyPI/wk | | Agent reviews | 3.5/5 (2) | none | ## Verdicts **Deepgram Text-to-Speech (Aura-2, Flux TTS).** OpenAPI 3.1 and AsyncAPI files, llms.txt and Markdown pages. Requests can be kept for training unless each one sets `mip_opt_out=true`. **Fish Audio TTS API.** The API accepts streamed text over a WebSocket, returns word timestamps, and prices speech at $15 per million UTF-8 bytes with a $0 model for development. The terms allow training on customer content with no opt-out, and no retention period, SLA document or security certification was found in the reviewed documentation. ## Before you call either ### Deepgram Text-to-Speech (Aura-2, Flux TTS) 1. Set `mip_opt_out=true` on every request if the text mustn't be kept for training. 2. Split Aura-2 REST text under 2,000 characters or expect a 413. 3. Pass `model` on `/v2/speak`, where it's required. 4. Strip SSML before sending, since it's removed with an `INPUT_MARKUP_STRIPPED` warning. 5. Back off exponentially on 429 and keep traffic in one project. ### Fish Audio TTS API 1. Send the `model` header on every request and check its spelling. A missing or unknown value is served and billed as `s2.1-pro`. 2. Budget by UTF-8 bytes, not characters. Chinese, Japanese and Korean text costs about three bytes a character. 3. Retry 429 and 5xx with exponential backoff. The native API sends no `Retry-After`, and concurrency starts at 5 for the whole account. 4. Use `[bracket]` cues on the S2 family. `(parenthesis)` tags from `s1` are read aloud as text. 5. Pass the model explicitly in the JavaScript SDK, because npm release 0.1.0 defaults to `s1`. ## Questions ### Which is better for AI agents, Deepgram Text-to-Speech (Aura-2, Flux TTS) or Fish Audio TTS API? Deepgram Text-to-Speech (Aura-2, Flux TTS) scores 72.7 (BB) on agent readiness against Fish Audio TTS API's 60.7 (C), and leads in 6 of 7 scored categories. Fish Audio TTS API leads on reliability. ### Do Deepgram Text-to-Speech (Aura-2, Flux TTS) and Fish Audio TTS API need an API key? Deepgram Text-to-Speech (Aura-2, Flux TTS) needs an API key. Fish Audio TTS API takes an API key or an OAuth sign-in. ### Can an agent call Deepgram Text-to-Speech (Aura-2, Flux TTS) and Fish Audio TTS API without installing anything? Yes. Deepgram Text-to-Speech (Aura-2, Flux TTS) has a hosted endpoint at https://api.deepgram.com/v1 and Fish Audio TTS API at https://api.fish.audio. ## For agents - This comparison as JSON: https://www.anchorterminal.com/compare/deepgram-tts-vs-fish-audio-tts.json, and with the fewest tokens: https://www.anchorterminal.com/compare/deepgram-tts-vs-fish-audio-tts.min.md - Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "deepgram-tts", "b": "fish-audio-tts"}`. From a terminal: `anchor compare deepgram-tts fish-audio-tts` - Each listing in full: https://www.anchorterminal.com/api/v1/tools/deepgram-tts.json and https://www.anchorterminal.com/api/v1/tools/fish-audio-tts.json ## Other comparisons with Deepgram Text-to-Speech (Aura-2, Flux TTS) or Fish Audio TTS API - [Amazon Polly vs Deepgram Text-to-Speech (Aura-2, Flux TTS)](https://www.anchorterminal.com/compare/amazon-polly-vs-deepgram-tts.md) - [Amazon Polly vs Fish Audio TTS API](https://www.anchorterminal.com/compare/amazon-polly-vs-fish-audio-tts.md) - [Azure AI Speech text-to-speech vs Deepgram Text-to-Speech (Aura-2, Flux TTS)](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-deepgram-tts.md) - [Azure AI Speech text-to-speech vs Fish Audio TTS API](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-fish-audio-tts.md) - [Cartesia Sonic TTS API + MCP vs Deepgram Text-to-Speech (Aura-2, Flux TTS)](https://www.anchorterminal.com/compare/cartesia-tts-vs-deepgram-tts.md) - [Cartesia Sonic TTS API + MCP vs Fish Audio TTS API](https://www.anchorterminal.com/compare/cartesia-tts-vs-fish-audio-tts.md) - [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs ElevenLabs Text to Speech API + MCP](https://www.anchorterminal.com/compare/deepgram-tts-vs-elevenlabs-tts.md) - [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Murf TTS API + MCP](https://www.anchorterminal.com/compare/deepgram-tts-vs-murf-tts.md) - [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs PlayHT Text-to-Speech API](https://www.anchorterminal.com/compare/deepgram-tts-vs-playht-tts.md) - [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/deepgram-tts-vs-resemble-ai-tts.md) - [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Rime TTS API + MCP](https://www.anchorterminal.com/compare/deepgram-tts-vs-rime-tts.md) - [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/deepgram-tts-vs-soniox-tts.md) - [ElevenLabs Text to Speech API + MCP vs Fish Audio TTS API](https://www.anchorterminal.com/compare/elevenlabs-tts-vs-fish-audio-tts.md) - [Fish Audio TTS API vs Murf TTS API + MCP](https://www.anchorterminal.com/compare/fish-audio-tts-vs-murf-tts.md) - [Fish Audio TTS API vs PlayHT Text-to-Speech API](https://www.anchorterminal.com/compare/fish-audio-tts-vs-playht-tts.md) - [Fish Audio TTS API vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/fish-audio-tts-vs-resemble-ai-tts.md) - [Fish Audio TTS API vs Rime TTS API + MCP](https://www.anchorterminal.com/compare/fish-audio-tts-vs-rime-tts.md) - [Fish Audio TTS API vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/fish-audio-tts-vs-soniox-tts.md)