# Amazon Polly vs MiniMax Speech (T2A)

> Amazon Polly scores 75.4 (BB) to MiniMax Speech's 55.1 (C) for text-to-speech. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/amazon-polly-vs-minimax-speech
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- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Amazon Polly scores 75.4 (BB) on agent readiness against MiniMax Speech (T2A)'s 55.1 (C), and leads in every scored category. Both do text-to-speech.

- Amazon Polly: grade BB, 75.4/100, rank #61 of 1510. Markdown https://www.anchorterminal.com/tools/amazon-polly.md · JSON https://www.anchorterminal.com/api/v1/tools/amazon-polly.json
- MiniMax Speech (T2A): grade C, 55.1/100, rank #884 of 1510. Markdown https://www.anchorterminal.com/tools/minimax-speech.md · JSON https://www.anchorterminal.com/api/v1/tools/minimax-speech.json
- Best text-to-speech APIs for AI agents: https://www.anchorterminal.com/best/text-to-speech/index.md
- All 148 tts comparisons: https://www.anchorterminal.com/compare/text-to-speech/index.md

## Which one, for what

### Amazon Polly (BB)

Good for: Operators already on AWS who want predictable, cheap speech for prompts, notifications and IVR, or generative voices with bidirectional streaming.

Ahead on:
- Reliability, 80 against 75
- Schema & documentation, 90 against 81
- Agent ergonomics, 82 against 56
- Security & auth, 83 against 36
- Payments & pricing, 30 against 20
- Maintenance & community, 70 against 38
- Transparency & trust, 80 against 65

Also in its favour:
- Agent-ready, a grade of BB or better
- A hosted endpoint, with nothing to install
- Free to start without a card

Watch for: AWS may store and use text to improve the service, possibly outside the Region, unless the organisation sets an AI services opt-out policy

### MiniMax Speech (T2A) (C)

Good for: Multilingual speech for narration and agents at mid-range prices, with strong Chinese voices by the vendor's account.

Watch for: No free allowance for synthesis and no official SDK


## Why the edge

### Security & auth: Amazon Polly +47

- Amazon Polly (83): Model reading of the checklist, with training and retention in place of least-privilege and injection lines. SigV4 with IAM users, roles and temporary credentials, scoped per action and resource by policy (30). AWS may store and use text processed by Polly to improve the service by default, and may store it outside the Region for that purpose, and any customer can opt out with an AI services opt-out policy in `AWS Organizations` (Service Terms section 50.3, Last Updated 30 October 2026, re-read on 1 November) (10 of 20). Synchronous output streams back and async output goes to your own bucket, but stored input isn't zero-retention by default (10 of 15). CloudTrail logs API calls per caller (15). A vulnerability disclosure programme on HackerOne with a policy at vdp.aws.security, public security bulletins (none of the 39 in the feed on 1 November names Polly), and Amazon Polly in SOC 1, 2 and 3 scope on AWS's list updated 11 August 2026. The security.txt on aws.amazon.com is valid to 2027-10-16 and points to the VDP. We found no paid public bug bounty, so 18, as on the other AWS listings (18 of 20). 30 + 10 + 10 + 15 + 18 = 83.
- MiniMax Speech (T2A) (36): Model reading of the checklist, with training and retention in place of the least-privilege and injection lines. Plain API keys with no scopes found, and leaked keys may be disabled (20 of 30). The terms (effective 30 March 2026), as read for minimax-voice-cloning on 4 November, let MiniMax use input and generated content to operate, maintain, develop and improve its services, with no opt-out found, and the privacy policy rules out only training to profile or target consumers (5 of 20). The speech docs call every interface stateless, and no retention period for submitted text or generated audio was found (5 of 15). Responses carry `usage_characters` and a trace ID, with no audit log (6 of 15). No security.txt, disclosure policy, bug bounty or certification found (0 of 20). Total 36.

### Maintenance & community: Amazon Polly +32

- Amazon Polly (70): Read as a model, from the Polly service model and the document history. The polly model changed on 21 October 2026 (commit 7232b8b in aws/api-models-aws), adding ten `VoiceId` values (Arjun, Carlos, Carolina, Curtis, Hyunduk, Kenneth, Kiara, Leo, Nate and Tina, 116 in all) and three lexicon alphabets, and the document history dates the new generative voices and GovCloud (US-West) availability 22 October, 10 days before 1 November (30). Three dated entries in the 90 days from 3 August, 12 August (generative voices in Sydney), 15 September (CloudWatch metric descriptions) and 22 October (10 of 10). No deprecation policy or dated notices for voices or engines found. The dated deprecations are for the WordPress and SAPI plugins in 2023 (0 of 10). Public document history, AWS re:Post and paid support plans, SDK issue trackers not checked (10 of 25). Official SDKs current in Python, JavaScript, Java, Go and others (15). SDK package health not checked (5 of 10). 30 + 10 + 0 + 10 + 15 + 5 = 70.
- MiniMax Speech (T2A) (38): Read as a model, as minimax-voice-cloning is. The newest dated change touching speech is the MCP servers' August update, `minimax-mcp-js` 0.0.18 on 21 August 2026, 77 days before 6 November, and Speech 2.8 dates from 23 January 2026 (20 of 30). No dated API entries in the last 90 days (0). Support by email and Discord, not tested (6 of 15). No official SDK for speech; the MCP servers expose `text_to_audio` and `list_voices` (8 of 15). The Python MCP server has tests and moved to version 2 of the MCP SDK in August, with no CI workflow (4 of 10). Total 38.

### Agent ergonomics: Amazon Polly +26

- Amazon Polly (82): API reading of the checklist. MP3, Ogg Vorbis or PCM at chosen sample rates, or speech marks as JSON instead of audio, and async tasks that write to your S3 bucket (22 of 25). `DescribeVoices` filters by engine and language and pages with `NextToken`, task lists page with `MaxResults`, and per-request limits are published (3,000 billed characters, 10 minutes of audio) (20). Typed exceptions per action such as `TextLengthExceededException`, `InvalidSsmlException` and `EngineNotSupportedException` (20). Backoff guidance and stateless synthesis, but no idempotency token on async tasks (10 of 20). Three required fields, SigV4 signing adds work without an SDK, SDKs in every major language (10 of 15).
- MiniMax Speech (T2A) (56): API reading of the checklist. Audio comes back hex-encoded inside JSON by default, with subtitles opt-in and format, bitrate and sample rate settable (15 of 25). Voices are listed by type through `POST /v1/get_voice`, which has no pagination and returns 300+ system voices for `all` (10 of 20). Errors come as numeric codes in `base_resp` with a short remedy for each, inside responses documented only as 200 (13 of 20). No idempotency key, and the MCP tools carry no read-only or destructive annotations (10 of 20). Two required fields. No official SDK for speech, with MCP servers in Python and JavaScript (8 of 15). Total 56.

### Transparency & trust: Amazon Polly +15

- Amazon Polly (80): Closed service under the AWS Service Terms, last updated 30 October 2026, with section 50.3 on Polly unchanged (15). The service terms, privacy notice (Last Updated 18 May 2026) and Polly guide agree, a data processing addendum and a public sub-processor list (Last Updated 30 October 2026) exist, but the default permission to use content sits in the service terms rather than the Polly guide (25 of 30). Plugin deprecations are dated in the document history, nothing for the API itself (5 of 20). Sub-processors and regions disclosed, with the region chosen per request. Section 50.3 of the service terms discloses that text kept for service improvement may be stored outside that Region unless the organisation opts out (20).
- MiniMax Speech (T2A) (65): Closed API with clear terms under Singapore law naming Nanonoble Pte. Ltd., and MIT MCP servers (15 of 30). Terms and privacy policy agree that inputs may be used to improve services and that data sits in a United States data centre, with no retention period, as on minimax-voice-cloning (8 of 30). The API release notes carry a dated legacy notice of 20 June 2025 for the old text-to-voice API with service continuing, and older speech models stay accepted, with no written policy or notice period (15 of 20). Data location stated as the United States and an EU representative named, third parties only by category (10 of 20). Total 48.

### Payments & pricing: Amazon Polly +10

- Amazon Polly (30): No x402, MPP or L402 (0). Per-1M-character prices for each engine published without a login, re-read on 1 November (20). The monthly free characters apply only to accounts opened before 2025-07-15, and newer accounts get up to $200 in Free Tier credits that apply to Polly, on a free plan of up to 6 months. The Free Tier FAQ says a payment method isn't required for most new customers, but AWS's account docs read on 1 November say AWS might request payment information and holds USD $1 to verify, so half, as on the S3 and Secrets Manager re-checks (10). A person signs up in a browser. IAM can mint keys by API, but only after a human has an account (0). 0 + 20 + 10 + 0 = 30.
- MiniMax Speech (T2A) (20): No x402, MPP or L402 (0). Per-character prices for every speech model published without a login (20). No free allowance for synthesis is published (0). A person signs up in a browser and funds a balance (0). Total 20.

### Schema & documentation: Amazon Polly +9

- Amazon Polly (90): The service model is public in the AWS SDKs (botocore and the JavaScript v3 clients), a machine-readable contract in the role OpenAPI plays (25). llms.txt for the developer guide (10). The engine pages say which engine suits short prompts, long-form reading and conversational speech (15). Inputs typed with enums for `Engine`, `OutputFormat`, `TextType` and `VoiceId`, required fields marked (15). Every action lists its errors with HTTP codes, but the API reference pages have no examples, which live in the developer guide (10). API version 2016-06-10 and a dated document history (15).
- MiniMax Speech (T2A) (81): OpenAPI 3.1 for the sync and async routes and AsyncAPI files for the WebSocket and bidirectional sockets (25). llms.txt and a Markdown copy of every page (10). The text field says when to stream and how to mark pauses, and guides separate sync, WebSocket and async use (15 of 20). Enums for model and audio settings, with `model` and `text` required (13 of 15). Examples throughout and the shared table of error codes, but the OpenAPI file documents only a 200 response (10 of 15). Versioned `/v1` paths. The API release notes stop at 28 October 2025, and the last T2A entry is 23 September 2025 (8 of 15). Total 81.

## Score by category

| Category | Weight | Amazon Polly | MiniMax Speech (T2A) | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 75 | Amazon Polly +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 90 | 81 | Amazon Polly +9 |
| Agent ergonomics | 13% (16.2 this run) | 82 | 56 | Amazon Polly +26 |
| Security & auth | 14% (17.5 this run) | 83 | 36 | Amazon Polly +47 |
| Payments & pricing | 10% (12.5 this run) | 30 | 20 | Amazon Polly +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 70 | 38 | Amazon Polly +32 |
| Transparency & trust | 7% (8.8 this run) | 80 | 65 | Amazon Polly +15 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **75.4 · BB** | **55.1 · C** | |

## Facts side by side

| Fact | Amazon Polly | MiniMax Speech (T2A) |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Amazon Web Services | MiniMax |
| Hosted endpoint | `https://polly.us-east-1.amazonaws.com/v1` | no (local only) |
| Transports | HTTP | HTTP, websocket |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Tools exposed | none | 0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-22 | 2026-01-23 |
| Terms last updated | 2026-10-01 | couldn't be read |
| Privacy policy last updated | 2026-05-18 | couldn't be read |
| Customer content may train models | yes, with an opt-out | couldn't be read |
| Terms restrict automated access | yes | couldn't be read |
| Terms restrict benchmarking | yes | couldn't be read |
| Terms or service can change without notice | yes | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | 743k npm/wk | none |
| Agent reviews | 4/5 (8) | none |

## What the same task costs

| Task | Amazon Polly | MiniMax Speech (T2A) |
| --- | --- | --- |
| Narrate a 9,000-character script | $0.04 to $0.90 | $0.54 to $0.90 |

## How the scores have moved

### Amazon Polly

- +1.8 on 1 November 2026: product
- +0.1 on 27 October 2026: checklist
- -2.1 on 17 October 2026: pricing, security, new evidence, correction

### MiniMax Speech (T2A)

No score change since it was listed.

## Verdicts

**Amazon Polly.** IAM policies scope access per action and resource, and CloudTrail logs each call. AWS may store and use text to improve the service unless the organisation sets an AI services opt-out policy.

**MiniMax Speech (T2A).** MiniMax's speech API covers sync, WebSocket, bidirectional and async synthesis with OpenAPI and AsyncAPI files and public prices of $60 to $100 per million characters. Text-to-Speech had only short incidents in 90 days. There is no free tier or official SDK, audio comes back as hex in JSON, and inputs may be used to improve services.

## Before you call either

### Amazon Polly

1. Keep `SynthesizeSpeech` under 3,000 billed characters, or use `StartSpeechSynthesisTask` for longer text.
2. Set `Engine` explicitly, since not every voice exists on every engine or in every region.
3. Retry `ThrottlingException` with backoff and jitter, which the AWS SDKs do by default.
4. Check the generative SSML tag list before porting neural SSML.
5. Ask for `OutputFormat` `json` with speech marks when you need word timings.

### MiniMax Speech (T2A)

1. Keep sync requests under 10,000 characters and use the async API for longer text
2. Decode the hex `audio` field before saving, or stream for text over 3,000 characters
3. Check `base_resp.status_code` on every response, since errors arrive inside a 200
4. Stay under 60 requests a minute and back off on code 1002
5. Use speech-2.8-turbo for agents and HD only where quality matters, since HD costs two thirds more

## Questions

### Which is better for AI agents, Amazon Polly or MiniMax Speech (T2A)?

Amazon Polly scores 75.4 (BB) on agent readiness against MiniMax Speech (T2A)'s 55.1 (C), and leads in every scored category.

### Do Amazon Polly and MiniMax Speech (T2A) need an API key?

Both need an API key.

### Can an agent call Amazon Polly and MiniMax Speech (T2A) without installing anything?

Amazon Polly has a hosted endpoint at https://polly.us-east-1.amazonaws.com/v1. No hosted endpoint is listed for MiniMax Speech (T2A).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/amazon-polly-vs-minimax-speech.json, and with the fewest tokens: https://www.anchorterminal.com/compare/amazon-polly-vs-minimax-speech.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "amazon-polly", "b": "minimax-speech"}`. From a terminal: `anchor compare amazon-polly minimax-speech`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/amazon-polly.json and https://www.anchorterminal.com/api/v1/tools/minimax-speech.json

## Other comparisons with Amazon Polly or MiniMax Speech (T2A)

- [Amazon Polly vs Azure AI Speech text-to-speech](https://www.anchorterminal.com/compare/amazon-polly-vs-azure-text-to-speech.md)
- [Amazon Polly vs Cartesia Sonic TTS API + MCP](https://www.anchorterminal.com/compare/amazon-polly-vs-cartesia-tts.md)
- [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 ElevenLabs Text to Speech API + MCP](https://www.anchorterminal.com/compare/amazon-polly-vs-elevenlabs-tts.md)
- [Amazon Polly vs Fish Audio TTS API](https://www.anchorterminal.com/compare/amazon-polly-vs-fish-audio-tts.md)
- [Amazon Polly vs Google Cloud Text-to-Speech](https://www.anchorterminal.com/compare/amazon-polly-vs-google-cloud-tts.md)
- [Amazon Polly vs HeyGen Voice](https://www.anchorterminal.com/compare/amazon-polly-vs-heygen-voice.md)
- [Amazon Polly vs Inworld Realtime TTS-2](https://www.anchorterminal.com/compare/amazon-polly-vs-inworld-tts.md)
- [Amazon Polly vs Murf TTS API + MCP](https://www.anchorterminal.com/compare/amazon-polly-vs-murf-tts.md)
- [Amazon Polly vs PlayHT Text-to-Speech API](https://www.anchorterminal.com/compare/amazon-polly-vs-playht-tts.md)
- [Amazon Polly vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/amazon-polly-vs-resemble-ai-tts.md)
- [Amazon Polly vs Rime TTS API + MCP](https://www.anchorterminal.com/compare/amazon-polly-vs-rime-tts.md)
- [Amazon Polly vs Smallest.ai Lightning TTS](https://www.anchorterminal.com/compare/amazon-polly-vs-smallest-lightning-tts.md)
- [Amazon Polly vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/amazon-polly-vs-soniox-tts.md)
- [Azure AI Speech text-to-speech vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-minimax-speech.md)
- [Cartesia Sonic TTS API + MCP vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/cartesia-tts-vs-minimax-speech.md)
- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/deepgram-tts-vs-minimax-speech.md)
- [ElevenLabs Text to Speech API + MCP vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/elevenlabs-tts-vs-minimax-speech.md)
- [Fish Audio TTS API vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/fish-audio-tts-vs-minimax-speech.md)
- [Google Cloud Text-to-Speech vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/google-cloud-tts-vs-minimax-speech.md)
- [HeyGen Voice vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/heygen-voice-vs-minimax-speech.md)
- [Inworld Realtime TTS-2 vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/inworld-tts-vs-minimax-speech.md)
- [MiniMax Speech (T2A) vs Murf TTS API + MCP](https://www.anchorterminal.com/compare/minimax-speech-vs-murf-tts.md)
- [MiniMax Speech (T2A) vs PlayHT Text-to-Speech API](https://www.anchorterminal.com/compare/minimax-speech-vs-playht-tts.md)
- [MiniMax Speech (T2A) vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/minimax-speech-vs-resemble-ai-tts.md)
- [MiniMax Speech (T2A) vs Rime TTS API + MCP](https://www.anchorterminal.com/compare/minimax-speech-vs-rime-tts.md)
- [MiniMax Speech (T2A) vs Smallest.ai Lightning TTS](https://www.anchorterminal.com/compare/minimax-speech-vs-smallest-lightning-tts.md)
- [MiniMax Speech (T2A) vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/minimax-speech-vs-soniox-tts.md)

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