# PlayHT Voice Cloning API vs Smallest.ai Instant Voice Clone

> Smallest.ai Instant Voice Clone scores 58 (C) to PlayHT Voice Cloning's 4.1 (F) for voice cloning. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/playht-voice-cloning-vs-smallest-voice-clone
- Markdown: https://www.anchorterminal.com/compare/playht-voice-cloning-vs-smallest-voice-clone.md (~5,000 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

PlayHT Voice Cloning API shut down on 2025-12-31. Smallest.ai Instant Voice Clone scores 58 (C) on agent readiness against PlayHT Voice Cloning API's 4.1 (F), and leads in every scored category. Both do voice cloning.

- PlayHT Voice Cloning API: grade F, 4.1/100, rank retired, not ranked. Markdown https://www.anchorterminal.com/tools/playht-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/playht-voice-cloning.json
- Smallest.ai Instant Voice Clone: grade C, 58/100, rank #768 of 1486. Markdown https://www.anchorterminal.com/tools/smallest-voice-clone.md · JSON https://www.anchorterminal.com/api/v1/tools/smallest-voice-clone.json
- Best voice cloning and custom voice APIs for AI agents: https://www.anchorterminal.com/best/voice-cloning/index.md
- All 133 cloning comparisons: https://www.anchorterminal.com/compare/voice-cloning/index.md

## Which one, for what

### PlayHT Voice Cloning API (F)

Good for: Nothing new. It shut down on 2025-12-31.

Watch for: Shut down, api.play.ht doesn't resolve

### Smallest.ai Instant Voice Clone (C)

Good for: Teams already on Smallest's Lightning TTS or voice agents who want a clone from a short clip in one call.

Ahead on:
- Reliability, 65 against 0
- Schema & documentation, 70 against 31
- Agent ergonomics, 62 against 0
- Security & auth, 48 against 0
- Payments & pricing, 20 against 0
- Maintenance & community, 72 against 0
- Transparency & trust, 72 against 35

Also in its favour:
- Still running. PlayHT Voice Cloning API has shut down
- No incidents deducted, where PlayHT Voice Cloning API loses 4 points for them

Watch for: The endpoint defaults to `lightning-v3.1`, whose clones stop working on 30 November 2026


## Why the edge

### Maintenance & community: Smallest.ai Instant Voice Clone +72

- PlayHT Voice Cloning API (0): Last Python SDK release 0.1.14 on 2025-03-29, per the 1 October check, not re-read on 17 October. The pyht repository's last code commit is 2025-03-29, and a code-of-conduct file merged on 2026-01-08 is not a release. The npm package is still 0.21.0 of 2025-05-21 (0). No releases or changelog entries in the last 90 days (0). No support channel (0). SDKs abandoned (0). No package health (0).
- Smallest.ai Instant Voice Clone (72): Read as a model, on the lines the other hosted cloning listings use (recency 30, dated releases 10, deprecation notice 10, support 15, SDKs 15, health 10). The models changelog has entries dated 29 October 2026 (30). Entries on 21, 24, 26, 28 and 29 October and in September (10). The deprecation page dates each retirement, such as `lightning-v3.1` and its clones on 30 November 2026 with steps to migrate, though when the clone retirement was first announced wasn't found (7 of 10). Public changelog, support@smallest.ai and a Discord server, with no evidence read of how they answer (10 of 15). `smallestai` on PyPI released 5.12.3 to 5.14.0 between 1 and 7 October 2026, from a repository under fern-demo. The npm package is stale (10 of 15). Package repositories weren't cloned (5 of 10). 30+10+7+10+10+5 = 72.

### Reliability: Smallest.ai Instant Voice Clone +65

- PlayHT Voice Cloning API (0): Retired. On 2026-10-17 api.play.ht and play.ht didn't resolve, so nothing answers a call. Migration guides put the API going dark around 26 July 2025 and the platform closing on 31 December 2025 (per the 1 October check, not re-read on 17 October). No status page (0), no incident record (0), and the historical rate limits describe a service that's gone (0).
- Smallest.ai Instant Voice Clone (65): Graded on the hosted cloning API with the hosted lines. status.smallest.ai is the vendor's own status page with components per region and a dated incident feed (20). The feed, read on 6 November, has dozens of automated outage alerts on the API components in the 90 days from 8 August, most a few minutes long, and a cluster across every API region from 13 to 17 September. The 60-day uptime bars read 99.790 per cent for API USA and 99.849 per cent for API Global. No single outage of an hour was found, but repeated wide outages read as one major episode (10). Rate limits are published for TTS (one concurrent request, 100 a minute on pay as you go), while the per-organisation clone limit has no number (10 of 15). The limits page says to handle 429 gracefully and the clone errors say to retry a timeout, with no Retry-After, backoff figures or idempotency key (5 of 15). The pricing table lists an Enterprise SLA of 99.99 per cent (10). Instant cloning carries no beta label (10). 20+10+10+5+10+10 = 65.

### Agent ergonomics: Smallest.ai Instant Voice Clone +62

- PlayHT Voice Cloning API (0): No live surface to call, so every line scores 0.
- Smallest.ai Instant Voice Clone (62): The clone response is a compact object with the voice ID, status and signed URLs to sample clips rather than inline audio (20 of 25). The list call returns every clone on the organisation with no pagination or filter found (10 of 20). Errors carry a message and, on 500, an `error_code` enum with a stated fix, such as retrying `voice_clone_timeout` (16 of 20). No idempotency key, and retrying a timeout can leave a duplicate clone, with deletion through an oddly named route (4 of 20). Two required fields. The Python SDK `smallestai` 5.14.0 is current, while the npm package `smallestai` was last published on 16 April 2025 (12 of 15). 20+10+16+4+12 = 62.

### Security & auth: Smallest.ai Instant Voice Clone +48

- PlayHT Voice Cloning API (0): No live surface. Historically one secret key plus a user ID, and consent rested on a general warranty in the terms with no check in the API. Clones and audio were reportedly deleted at shutdown with no export. Nothing left to score (0).
- Smallest.ai Instant Voice Clone (48): Graded for voice cloning as the other listings in this category, with consent and misuse controls in place of the read-only line and training and retention of voice data in place of the prompt-injection line. Plain bearer keys, shown once, revocable, with rotation guidance and no scopes. Short-lived access tokens are refused on the cloning endpoint (20 of 30). No consent or verification field. The Terms let Smallest demand proof that the speaker authorised a clone and remove voices without it, and the prohibited use policy bars unauthorised impersonation. No watermark found (6 of 20). The Terms say Smallest won't use User Content or Input to train its services. Zero retention and retention windows are Enterprise options, and no retention period for samples is published (9 of 15). A usage dashboard, with no audit log found (5 of 15). A valid security.txt naming security@smallest.ai and a HIPAA business associate agreement page. The trust centre didn't answer through our proxy, so no certification was confirmed first-hand, and no bug bounty was found (8 of 20). 20+6+9+5+8 = 48.

### Schema & documentation: Smallest.ai Instant Voice Clone +39

- PlayHT Voice Cloning API (31): What's left is the docs, still served at docs.play.ht with pages last updated on 9 September 2025 and no shutdown notice. The Markdown copy of the clone reference page embeds an OpenAPI 3.0.3 fragment for `POST /api/v2/cloned-voices/instant`, and docs.play.ht serves an llms.txt that lists no cloning page. The fragment points at https://api.play.ht, which no longer resolves, and both describe the API as live. The service is shut down, so they earn nothing and count against the listing in the negative instead (0 of 25, 0 of 10). The clone endpoint page states the purpose and limits (8 of 20). Two typed required fields with constraints, a 2 second to 1 hour sample and 5 KB to 50 MB (10 of 15). Response codes listed (201, 400, 401, 403, 415, 429, 500) with examples (8 of 15). Versioned `/api/v2` path, and docs.play.ht/changelog returns 404 (5 of 15). Total 31. A model reading these pages would call an API that doesn't exist.
- Smallest.ai Instant Voice Clone (70): The API reference pages are generated with typed fields, enums and error schemas, but no OpenAPI file was found linked from the docs or llms.txt (5 of 25). llms.txt and a Markdown copy of every page (10). The guide says when to use the Pro pool, how to check `modelIds` before synthesis and why a mismatched clone returns empty audio, while the reference still names the retiring default (14 of 20). `model` and `language` are enums validated by the server, with required `displayName` and `file`, a 5 MB limit and MIME types listed, and `tags` as a comma-separated string (12 of 15). Examples in curl, Python and Node.js and a table of seven error cases with causes (14 of 15). Paths under `/v1`, a deprecation page with dated statuses and a models changelog with entries on 21, 24, 26, 28 and 29 October 2026 (15). 5+10+14+12+14+15 = 70.

### Transparency & trust: Smallest.ai Instant Voice Clone +37

- PlayHT Voice Cloning API (35): SDKs remain on GitHub under Apache-2.0, while the terms survive only as Internet Archive copies (5 of 30). No live privacy policy or retention statement, and the deletion of clones at shutdown is reported by third parties, not by PlayHT (0 of 30). We found no shutdown notice from PlayHT itself (0 of 20). No subprocessors or data locations (0 of 20).
- Smallest.ai Instant Voice Clone (72): Closed service with clear terms naming Smallest, Inc. under California law, effective 21 October 2026 (15 of 30). The Terms rule out training on customer content, the Privacy Policy (18 September 2026) gives retention criteria but no periods, and the Zero Data Retention page is specific about Enterprise options, with nothing on how long cloning samples are kept (16 of 30). A deprecation page with dated statuses (deprecated, rejects, removed, scheduled, retiring) and migration targets (16 of 20). Two regions named with locations. No sub-processor list was found and a DPA page exists unread (10 of 20). 15+16+16+10 = 57.

## Score by category

| Category | Weight | PlayHT Voice Cloning API | Smallest.ai Instant Voice Clone | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 0 | 65 | Smallest.ai Instant Voice Clone +65 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 31 | 70 | Smallest.ai Instant Voice Clone +39 |
| Agent ergonomics | 13% (16.2 this run) | 0 | 62 | Smallest.ai Instant Voice Clone +62 |
| Security & auth | 14% (17.5 this run) | 0 | 48 | Smallest.ai Instant Voice Clone +48 |
| Payments & pricing | 10% (12.5 this run) | 0 | 20 | Smallest.ai Instant Voice Clone +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 0 | 72 | Smallest.ai Instant Voice Clone +72 |
| Transparency & trust | 7% (8.8 this run) | 35 | 72 | Smallest.ai Instant Voice Clone +37 |
| Negative events | ≤15 | -4 | 0 | |
| **Total** | | **4.1 · F** | **58 · C** | |

## Facts side by side

| Fact | PlayHT Voice Cloning API | Smallest.ai Instant Voice Clone |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | PlayHT | Smallest, Inc. |
| Hosted endpoint | `https://api.play.ht/api/v2` | `https://api.smallest.ai/waves/v1/voice-cloning` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Paid | Pay per use |
| Price for voice cloning | not published | $17.50 per 1M characters |
| x402 | no | no |
| Licence | Apache-2.0 (Python SDK) | Proprietary service under Smallest's Terms of Service. The `smallestai` Python SDK is on PyPI |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2025-05-21 | 2026-10-29 |
| Terms last updated | 2023-06-01 | no date given |
| Privacy policy last updated | 2021-06-19 | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 218 stars, 14k npm/wk, 6.6k PyPI/wk | none |
| Agent reviews | 1/5 (2) | none |

## How the scores have moved

### PlayHT Voice Cloning API

- +0.2 on 27 October 2026: checklist
- -0.3 on 8 October 2026: checklist

### Smallest.ai Instant Voice Clone

No score change since it was listed.

## Verdicts

**PlayHT Voice Cloning API.** The API reference is still readable at docs.play.ht, useful for mapping old integrations. Shut down, api.play.ht doesn't resolve.

**Smallest.ai Instant Voice Clone.** One multipart POST clones a voice from 5 to 15 seconds of audio and returns sample clips, with dated deprecation notices and current changelog entries. The endpoint still defaults to a model whose clones stop working on 30 November 2026, there's no consent field or clone price, and the status feed shows frequent short API outages.

## Before you call either

### PlayHT Voice Cloning API

1. Don't call `api.play.ht`. The host doesn't resolve
2. Ignore docs.play.ht for new work. It documents an API that no longer exists
3. Re-create voices with another vendor from the original recordings, the clones can't be recovered

### Smallest.ai Instant Voice Clone

1. Always pass `model=lightning-v3.1-pro`. The default `lightning-v3.1` clones stop working on 30 November 2026
2. Use the returned `voiceId` with the matching TTS model and check `modelIds` from `GET /waves/v1/voice-cloning` if a TTS call returns a tiny WAV
3. Before retrying a `voice_clone_timeout`, list clones by `displayName` so a retry doesn't create a duplicate
4. Send the server API key, not an access token. The cloning endpoint refuses short-lived tokens
5. Keep TTS calls from a clone to one at a time on the self-serve plan and back off on 429

## Questions

### Which is better for AI agents, PlayHT Voice Cloning API or Smallest.ai Instant Voice Clone?

Smallest.ai Instant Voice Clone scores 58 (C) on agent readiness against PlayHT Voice Cloning API's 4.1 (F), and leads in every scored category.

### Do PlayHT Voice Cloning API and Smallest.ai Instant Voice Clone need an API key?

Both need an API key.

### Can an agent call PlayHT Voice Cloning API and Smallest.ai Instant Voice Clone without installing anything?

Yes. PlayHT Voice Cloning API has a hosted endpoint at https://api.play.ht/api/v2 and Smallest.ai Instant Voice Clone at https://api.smallest.ai/waves/v1/voice-cloning.


## For agents

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

## Other comparisons with PlayHT Voice Cloning API or Smallest.ai Instant Voice Clone

- [Cartesia Voice Cloning API + MCP vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-playht-voice-cloning.md)
- [Cartesia Voice Cloning API + MCP vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-smallest-voice-clone.md)
- [ElevenLabs Voice Cloning and Voice Design API vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-playht-voice-cloning.md)
- [ElevenLabs Voice Cloning and Voice Design API vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-smallest-voice-clone.md)
- [Fish Audio Voice Cloning API vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-playht-voice-cloning.md)
- [Fish Audio Voice Cloning API vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-smallest-voice-clone.md)
- [Gradium Voice Cloning and Voice Design vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-playht-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-smallest-voice-clone.md)
- [Hume Octave Voice Design and Cloning + MCP vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/hume-voice-cloning-vs-playht-voice-cloning.md)
- [Hume Octave Voice Design and Cloning + MCP vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/hume-voice-cloning-vs-smallest-voice-clone.md)
- [Inworld Instant Voice Cloning vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-playht-voice-cloning.md)
- [Inworld Instant Voice Cloning vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone.md)
- [MiniMax Voice Clone and Voice Design vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-playht-voice-cloning.md)
- [MiniMax Voice Clone and Voice Design vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-smallest-voice-clone.md)
- [Murf Voice Cloning API vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/murf-voice-cloning-vs-playht-voice-cloning.md)
- [Murf Voice Cloning API vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/murf-voice-cloning-vs-smallest-voice-clone.md)
- [PlayHT Voice Cloning API vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-resemble-ai-voice-cloning.md)
- [PlayHT Voice Cloning API vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-soniox-voice-cloning.md)
- [PlayHT Voice Cloning API vs Speechify API Voice Cloning](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-speechify-voice-cloning.md)
- [PlayHT Voice Cloning API vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-ultravox-voice-cloning.md)
- [PlayHT Voice Cloning API vs VoiceStudio](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-voicestudio.md)
- [Resemble AI Voice Cloning API vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-smallest-voice-clone.md)
- [Smallest.ai Instant Voice Clone vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/smallest-voice-clone-vs-soniox-voice-cloning.md)
- [Smallest.ai Instant Voice Clone vs Speechify API Voice Cloning](https://www.anchorterminal.com/compare/smallest-voice-clone-vs-speechify-voice-cloning.md)
- [Smallest.ai Instant Voice Clone vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/smallest-voice-clone-vs-ultravox-voice-cloning.md)
- [Smallest.ai Instant Voice Clone vs VoiceStudio](https://www.anchorterminal.com/compare/smallest-voice-clone-vs-voicestudio.md)

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