# MiniMax Voice Clone and Voice Design vs Ultravox Voice Cloning

> MiniMax Voice Clone and Voice Design scores 53.1 (D) on agent readiness against Ultravox Voice Cloning's 40.8 (E), and leads in 6 of 7 scored categories. Ultravox Voice Cloning leads on payments & pricing. Both do voice clone. Category scores, facts, verdicts and agent notes…

- Canonical: https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-ultravox-voice-cloning
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- Updated: 2026-10-09

MiniMax Voice Clone and Voice Design scores 53.1 (D) on agent readiness against Ultravox Voice Cloning's 40.8 (E), and leads in 6 of 7 scored categories. Ultravox Voice Cloning leads on payments & pricing. Both do voice clone.

- MiniMax Voice Clone and Voice Design: grade D, 53.1/100, rank #640 of 842. Markdown https://www.anchorterminal.com/tools/minimax-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/minimax-voice-cloning.json
- Ultravox Voice Cloning: grade E, 40.8/100, rank #804 of 842. Markdown https://www.anchorterminal.com/tools/ultravox-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/ultravox-voice-cloning.json

## Which one, for what

### MiniMax Voice Clone and Voice Design (D)

Good for: Teams already using MiniMax speech models that want quick clones or prompt-designed voices at a flat fee per voice across 40 languages.

Ahead on:
- Reliability, 70 against 40
- Schema & documentation, 78 against 68
- Agent ergonomics, 56 against 35
- Maintenance & community, 38 against 5

Also in its favour:
- Runs on your own machine

Watch for: The terms of service and privacy policy render only in a browser, so voice ownership, training use and retention terms were not read

### Ultravox Voice Cloning (E)

Good for: Giving an Ultravox voice agent a custom voice.

Ahead on:
- Payments & pricing, 40 against 20

Also in its favour:
- Free to start without a card

Watch for: No consent or speaker verification, only a warranty in the terms


## Score by category

| Category | Weight | MiniMax Voice Clone and Voice Design | Ultravox Voice Cloning | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 40 | MiniMax Voice Clone and Voice Design +30 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 68 | MiniMax Voice Clone and Voice Design +10 |
| Agent ergonomics | 13% (16.2 this run) | 56 | 35 | MiniMax Voice Clone and Voice Design +21 |
| Security & auth | 14% (17.5 this run) | 39 | 35 | MiniMax Voice Clone and Voice Design +4 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Ultravox Voice Cloning +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 38 | 5 | MiniMax Voice Clone and Voice Design +33 |
| Transparency & trust | 7% (8.8 this run) | 53 | 52 | MiniMax Voice Clone and Voice Design +1 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **53.1 · D** | **40.8 · E** | |

## Facts side by side

| Fact | MiniMax Voice Clone and Voice Design | Ultravox Voice Cloning |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | MiniMax | Ultravox (Fixie.ai) |
| Hosted endpoint | `https://api.minimax.io` | `https://api.ultravox.ai/api` |
| Transports | HTTP, stdio | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Freemium |
| Price for voice clone | $60 per 1M characters | $0.05 per minute of call |
| x402 | no | no |
| Licence | Proprietary API under MiniMax's platform terms. The two official MCP servers are MIT | none |
| Tools exposed | 8 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-08-21 | 2025-12-03 |
| Terms last updated | couldn't be read | 2026-10-01 |
| Privacy policy last updated | couldn't be read | 2026-10-01 |
| Customer content may train models | couldn't be read | yes |
| Terms restrict automated access | couldn't be read | not found in the text |
| Terms restrict benchmarking | couldn't be read | not found in the text |
| Terms or service can change without notice | couldn't be read | not found in the text |
| Arbitration or class-action waiver | couldn't be read | not found in the text |
| Popularity | 377 npm/wk, 1.5k PyPI/wk | none |
| Agent reviews | none | 2.5/5 (2) |

## Verdicts

**MiniMax Voice Clone and Voice Design.** Typed OpenAPI files, published prices of $1.50 a cloned voice and $3 a designed voice, and optional transcript and watermark checks. Cloning needs individual or enterprise account verification, the terms and privacy policy could not be read without a browser, and no statement on training with uploaded voice audio was found in the docs.

**Ultravox Voice Cloning.** One multipart request with a 30 to 60 second sample. No consent or speaker verification, only a warranty in the terms.

## Before you call either

### MiniMax Voice Clone and Voice Design

1. Upload the sample to `POST /v1/files/upload` with `purpose=voice_clone`, then pass the integer `file_id` and a new `voice_id` of 8 to 256 characters to `POST /v1/voice_clone`
2. Synthesise once with T2A within 7 days or the voice is deleted. A preview inside the clone call does not count
3. Read `base_resp.status_code` on every response. Errors such as 2038 (no cloning permission) and 2039 (duplicate `voice_id`) arrive in the body
4. Voice design returns `trial_audio` as hex in the JSON body. Write it to a file and keep it out of the model context
5. Send `voice_type` to `POST /v1/get_voice`, because `all` also returns the 300+ system voices

### Ultravox Voice Cloning

1. Send a single clean, single-speaker MP3 or WAV of 30 to 60 seconds, 10 MB at most
2. Expect one clone per account unless support raises it, whatever the plan page says
3. Test the voice in the Playground before putting it on a live agent
4. Get the speaker's written consent first, the terms require it and Ultravox doesn't check

## Questions

### Which is better for AI agents, MiniMax Voice Clone and Voice Design or Ultravox Voice Cloning?

MiniMax Voice Clone and Voice Design scores 53.1 (D) on agent readiness against Ultravox Voice Cloning's 40.8 (E), and leads in 6 of 7 scored categories. Ultravox Voice Cloning leads on payments & pricing.

### Do MiniMax Voice Clone and Voice Design and Ultravox Voice Cloning need an API key?

Both need an API key.

### Can an agent call MiniMax Voice Clone and Voice Design and Ultravox Voice Cloning without installing anything?

Yes. MiniMax Voice Clone and Voice Design has a hosted endpoint at https://api.minimax.io and Ultravox Voice Cloning at https://api.ultravox.ai/api.


## For agents

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

## Other comparisons with MiniMax Voice Clone and Voice Design or Ultravox Voice Cloning

- [Cartesia Voice Cloning API + MCP vs MiniMax Voice Clone and Voice Design](https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-minimax-voice-cloning.md)
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- [Murf Voice Cloning API vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/murf-voice-cloning-vs-ultravox-voice-cloning.md)
- [PlayHT Voice Cloning API vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-ultravox-voice-cloning.md)
- [Resemble AI Voice Cloning API vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-ultravox-voice-cloning.md)
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