{ "data": { "a": { "slug": "smallest-voice-clone", "name": "Smallest.ai Instant Voice Clone", "vendor": "Smallest, Inc.", "vendorUrl": "https://smallest.ai", "kind": "model", "category": "voice-cloning", "summary": "Smallest.ai's instant voice cloning API creates a reusable voice for its Lightning text-to-speech models from a 5 to 15 second sample in one multipart POST, returning the voice ID and sample clips of the cloned voice.", "url": "https://www.anchorterminal.com/tools/smallest-voice-clone", "markdownUrl": "https://www.anchorterminal.com/tools/smallest-voice-clone.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/smallest-voice-clone.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/smallest-voice-clone.json", "dns": "smallest-voice-clone.grade.anchorterminal.com", "license": "Proprietary service under Smallest's Terms of Service. The `smallestai` Python SDK is on PyPI", "transports": [ "http" ], "remoteUrl": "https://api.smallest.ai/waves/v1/voice-cloning", "packages": [ { "registry": "pypi", "name": "smallestai" } ], "auth": "api-key", "authNotes": "Bearer API key created in the Smallest dashboard after a browser signup, shown once, revoked by deleting it. Keys have no scopes. Short-lived access tokens minted from a key work on TTS, STT and speech-to-speech routes but are not accepted on the cloning endpoint.", "pricing": "usage", "pricingNotes": "No price per clone is published. Speech from a clone is about $0.175 per 10,000 characters on Lightning v3.1 and $0.195 on v3.1 Pro, pay as you go. The agents pricing page states $10 in free credits. The models pricing table marks voice cloning No on pay as you go, while the docs let any API key clone (checked 2026-11-06).", "priceSummary": "Pay per use", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs, llms.txt or the pricing pages (checked 2026-11-06).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-06" }, "docsUrl": "https://docs.smallest.ai/models/voice-cloning/instant-clone-api", "llmsTxt": "https://docs.smallest.ai/llms.txt", "capabilities": [ "voice.clone", "speech.tts" ], "tags": [ "hosted", "official", "closed-source", "usage", "python", "llms-txt", "status-page", "enterprise", "data-residency" ], "lastRelease": "2026-10-29", "graded": true, "anchor": { "graded": true, "score": 58, "grade": "C", "agentReady": false, "rank": 768, "ranked": true, "rankOf": 1486, "categoryRank": 8, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 62, "maintenance": 72, "payments": 20, "reliability": 65, "schema": 70, "security": 48, "transparency": 72 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "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.", "bestFor": "Teams already on Smallest's Lightning TTS or voice agents who want a clone from a short clip in one call.", "strengths": [ "Synchronous clone from 5 to 15 seconds of audio that returns the voice ID and signed URLs to sample clips of the new voice", "Seven documented error cases with causes, including `voice_clone_timeout` and `voice_clone_error` codes", "A deprecation page dates every retirement and gives the migration steps for clones", "The Terms say customer content isn't used for training, and India and USA region hostnames are documented", "llms.txt and a Markdown copy of every docs page" ], "weaknesses": [ "The endpoint defaults to `lightning-v3.1`, whose clones stop working on 30 November 2026", "No consent or verification field, and no price per clone or clone limit published", "The pricing table marks voice cloning unavailable on pay as you go, while the docs let any key clone", "status.smallest.ai lists dozens of short API outages in 90 days, with a cluster across every region on 13 to 17 September 2026", "No idempotency key, no pagination on the clone list, and plain unscoped API keys" ], "agentNotes": [ "Always pass `model=lightning-v3.1-pro`. The default `lightning-v3.1` clones stop working on 30 November 2026", "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", "Before retrying a `voice_clone_timeout`, list clones by `displayName` so a retry doesn't create a duplicate", "Send the server API key, not an access token. The cloning endpoint refuses short-lived tokens", "Keep TTS calls from a clone to one at a time on the self-serve plan and back off on 429" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 58 } ], "editorialScores": { "ergonomics": 62, "maintenance": 72, "payments": 20, "reliability": 65, "schema": 70, "security": 48, "transparency": 57 }, "provenanceScore": 87, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "pip install smallestai", "http": "curl -X POST \"https://api.smallest.ai/waves/v1/voice-cloning\" \\\n -H \"Authorization: Bearer $SMALLEST_API_KEY\" \\\n -F \"displayName=my-custom-voice\" \\\n -F \"file=@/path/to/sample.wav\" \\\n -F \"model=lightning-v3.1-pro\" \\\n -F \"language=en\"" }, "letme": { "capability": "https://letme.dev/voice.clone", "tool": "https://letme.dev/smallest-voice-clone" }, "sameCompany": [ "smallest-pulse-stt", "smallest-lightning-tts" ], "area": "voice", "unitPrices": [ { "item": "Speech from a clone, Lightning v3.1", "unit": "1m-chars", "usd": 17.5, "note": "about $0.175 per 10,000 characters, pay as you go" }, { "item": "Speech from a clone, Lightning v3.1 Pro", "unit": "1m-chars", "usd": 19.5, "note": "about $0.195 per 10,000 characters, pay as you go" } ], "provenance": { "legalEntity": "Smallest, Inc.", "domain": "smallest.ai", "domainRegistered": "2023-09-02", "endpointOnVendorDomain": true, "terms": "https://smallest.ai/terms-of-service", "privacy": "https://smallest.ai/privacy-policy", "statusPage": "https://status.smallest.ai", "changelog": "https://docs.smallest.ai/changelog/models", "securityTxt": "valid", "checked": "2026-11-06", "notes": [ "The Terms of Service (effective 21 October 2026) name Smallest, Inc. under California law with arbitration. The Privacy Policy and Prohibited Use Policy are effective 18 September 2026.", "The Prohibited Use Policy bars data mining, robots or scraping except as the site's robots.txt allows. smallest.ai/robots.txt allows ClaudeBot and all agents on the pages read and sets `Content-Signal: ai-train=yes, search=yes, ai-input=yes`.", "security.txt at smallest.ai/.well-known/security.txt is valid until 31 December 2026, with security@smallest.ai.", "RDAP gives smallest.ai a registration date of 2 September 2023.", "trust.smallest.ai did not answer through our proxy (502) and smallest.ai/security returns 404." ], "score": 87 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/smallest-voice-clone.json", "live": { "slug": "smallest-voice-clone", "probe": { "target": "https://api.smallest.ai/waves/v1/voice-cloning", "method": "get", "lastAt": "2026-11-07T18:20:55.191256377Z", "lastOk": true, "lastStatus": 401, "lastMs": 378, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 361, "p95ms24h": 429, "samples24h": 200, "samples30d": 200, "days": [ { "date": "2026-11-06", "probes": 13, "ok": 13 }, { "date": "2026-11-07", "probes": 187, "ok": 187 } ] }, "vendorStatus": { "page": "https://status.smallest.ai", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-11-07T04:48:45.839717169Z" }, "versions": [ { "registry": "pypi", "name": "smallestai", "version": "5.14.0", "released": "2026-10-07", "seenAt": "2026-11-07T00:06:42.794457962Z" } ], "pypiWeekly": 850, "securityTxt": { "url": "https://smallest.ai/.well-known/security.txt", "state": "valid", "expires": "2026-12-31T23:59:59.000Z", "checkedAt": "2026-11-07T16:01:21.76871346Z" }, "llmsTxt": { "url": "https://docs.smallest.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:34:00.872777157Z" }, "updatedAt": "2026-11-07T18:20:55.191256377Z" } }, "answer": "Soniox Voice Cloning scores 68.7 (B) on agent readiness against Smallest.ai Instant Voice Clone's 58 (C), and leads in 5 of 7 scored categories.", "b": { "slug": "soniox-voice-cloning", "name": "Soniox Voice Cloning", "vendor": "Soniox", "vendorUrl": "https://soniox.com", "kind": "model", "category": "voice-cloning", "summary": "Instant clones for Soniox TTS from one reference clip of up to 2 minutes, made in the Console or with `POST /v1/voices`.", "url": "https://www.anchorterminal.com/tools/soniox-voice-cloning", "markdownUrl": "https://www.anchorterminal.com/tools/soniox-voice-cloning.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/soniox-voice-cloning.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/soniox-voice-cloning.json", "dns": "soniox-voice-cloning.grade.anchorterminal.com", "repo": "https://github.com/soniox/soniox-python", "license": "Apache-2.0 (Python SDK)", "transports": [ "http" ], "remoteUrl": "https://api.soniox.com/v1", "packages": [ { "registry": "npm", "name": "@soniox/node" }, { "registry": "pypi", "name": "soniox" } ], "auth": "api-key", "authNotes": "Bearer API key per project, with read and write permissions for cloned voices and the other resources, or a temporary key for browser clients. Voices belong to the project that created them, so use a key from the same project to create, list, recompute, delete or speak with them.", "pricing": "usage", "pricingNotes": "No separate cloning fee is published. Speech from any voice is billed at the TTS token rates, $4.00 per 1M input text tokens and $21.50 per 1M output audio tokens, about $0.70 an hour. 20 voices per organisation by default (https://soniox.com/pricing).", "priceSummary": "Pay per use", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 or machine payment in the docs or pricing. Billed to a funded account (checked 2026-09-30).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 12, "npmWeekly": 22200, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://docs.soniox.com/tts/concepts/voice-cloning", "llmsTxt": "https://docs.soniox.com/llms.txt", "openapi": "https://docs.soniox.com/openapi.yaml", "capabilities": [ "voice.clone", "speech.tts" ], "tags": [ "hosted", "closed-source", "python", "typescript", "llms-txt", "async-jobs", "openapi" ], "lastRelease": "2026-11-03", "graded": true, "anchor": { "graded": true, "score": 68.7, "grade": "B", "agentReady": false, "rank": 274, "ranked": true, "rankOf": 1486, "categoryRank": 3, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 82, "maintenance": 75, "payments": 20, "reliability": 87, "schema": 86, "security": 67, "transparency": 71 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-04" }, "negative": -3, "negativeNotes": [ "2026-10-02. Python SDK `soniox` 2.10.0, a minor release, lists under Removed `build_payload()` and `api_key` on `RealtimeSTTConfig` and `RealtimeTTSConfig` (reading `config.api_key` now raises `AttributeError`), and makes the API key a required argument of the realtime session classes, used to speak with a cloned voice. 2.9.0 marks none of these deprecated. A breaking change in a minor release without notice takes 3, as on soniox-tts (https://github.com/soniox/soniox-python/blob/main/CHANGELOG.md)." ], "verdict": "One API call and a clip of up to 2 minutes, with an OpenAPI file covering create, list, recompute and delete. No consent capture or speaker verification, and the terms say so. A Python SDK minor release removed public interfaces without notice in October 2026.", "bestFor": "A quick clone that has to speak many languages, from a vendor with clean data terms.", "strengths": [ "One API call and a clip of up to 2 minutes", "Clones speak all 60+ TTS languages", "Audio never used for training, and clips stay only until the voice is deleted", "OpenAPI 3.1.0 file covers every voice endpoint, with cursor paging and per-model status", "API keys carry read and write permissions for cloned voices" ], "weaknesses": [ "No consent capture or speaker verification, and the terms say so", "Instant clones only, no professional tier or voice design", "20 voices per organisation and 3 concurrent TTS requests by default", "Voices must be recomputed by hand after a new TTS model ships", "No free tier, and Python SDK 2.10.0 removed public interfaces in a minor release" ], "agentNotes": [ "Poll the voice until the target model's status is `ready` before using it in TTS", "On `voice_not_prepared` call recompute, don't retry the TTS request", "Don't retry `voice_failed` even though it's a 503. Create a new voice from a better clip", "Use a key from the project that owns the voice, voices are per project", "Keep the clip under 2 minutes and 35 MB, longer fails with `voice_audio_too_long`", "Send the API key with the WebSocket connection, not in the config message, before 15 January 2027" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 68.7 } ], "editorialScores": { "ergonomics": 82, "maintenance": 75, "payments": 20, "reliability": 87, "schema": 86, "security": 67, "transparency": 60 }, "provenanceScore": 81, "checked": { "categories": { "ergonomics": "2026-11-04", "maintenance": "2026-11-04", "payments": "2026-11-04", "reliability": "2026-11-04", "schema": "2026-11-04", "security": "2026-11-04", "transparency": "2026-11-04" }, "last": "2026-11-04", "lastMoved": "2026-11-04", "oldest": "2026-11-04", "stale": false, "staleAfterDays": 90 } }, "connect": { "http": "curl https://api.soniox.com/v1/voices -H \"Authorization: Bearer $SONIOX_API_KEY\" \\\n -F name=narrator -F file=@sample.wav" }, "letme": { "capability": "https://letme.dev/voice.clone", "tool": "https://letme.dev/soniox-voice-cloning" }, "sameCompany": [ "soniox-stt", "soniox-tts" ], "area": "voice", "unitPrices": [ { "item": "Speech from a cloned voice", "unit": "audio-minute", "usd": 0.0117, "note": "same TTS token rates as built-in voices, Soniox's estimate of $0.70 an hour" } ], "provenance": { "legalEntity": "Soniox Inc.", "domain": "soniox.com", "domainRegistered": "2020-03-23", "endpointOnVendorDomain": true, "terms": "https://soniox.com/policies/terms-of-service", "privacy": "https://soniox.com/policies/privacy-policy", "statusPage": "https://status.soniox.com", "changelog": "https://docs.soniox.com/tts/models", "securityTxt": "none", "checked": "2026-11-04", "notes": [ "Terms and privacy policy last updated 2026-06-29 (per the 1 October check). The company address is Foster City, California", "The docs moved to docs.soniox.com (soniox.com/docs answers 308 to it). soniox.com/.well-known/security.txt answers 404, re-read on 4 November 2026." ], "score": 81 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/soniox-voice-cloning.json", "live": { "slug": "soniox-voice-cloning", "probe": { "target": "https://api.soniox.com/v1", "method": "get", "lastAt": "2026-11-07T18:20:55.898455647Z", "lastOk": true, "lastStatus": 404, "lastMs": 383, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 249, "p95ms24h": 345, "samples24h": 239, "samples30d": 7910, "days": [ { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 247 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 249 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 249 }, { "date": "2026-10-28", "probes": 250, "ok": 250 }, { "date": "2026-10-29", "probes": 249, "ok": 249 }, { "date": "2026-10-30", "probes": 249, "ok": 249 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 249 }, { "date": "2026-11-02", "probes": 250, "ok": 250 }, { "date": "2026-11-03", "probes": 248, "ok": 248 }, { "date": "2026-11-04", "probes": 246, "ok": 246 }, { "date": "2026-11-05", "probes": 185, "ok": 185 }, { "date": "2026-11-06", "probes": 241, "ok": 241 }, { "date": "2026-11-07", "probes": 187, "ok": 187 } ] }, "vendorStatus": { "page": "https://status.soniox.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-11-03T03:27:43.144175952Z" }, "versions": [ { "registry": "npm", "name": "@soniox/node", "version": "2.5.0", "seenAt": "2026-11-07T00:07:19.350172405Z" }, { "registry": "pypi", "name": "soniox", "version": "2.11.0", "released": "2026-11-03", "seenAt": "2026-11-07T00:07:19.558522404Z" } ], "githubStars": 13, "npmWeekly": 39562, "pypiWeekly": 214784, "securityTxt": { "url": "https://soniox.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:56.119851929Z" }, "llmsTxt": { "url": "https://docs.soniox.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:34:02.583298626Z" }, "domain": { "domain": "soniox.com", "registered": "2020-03-23", "source": "https://rdap.verisign.com/com/v1/domain/soniox.com", "checkedAt": "2026-11-01T14:17:24.699916178Z" }, "github": { "repo": "soniox/soniox-python", "checkedAt": "2026-11-02T09:26:52.131649771Z", "stars": 13, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-02T13:42:01Z", "openIssues": 0, "openPRs": 1, "issuesOpened90d": 0, "issuesClosed90d": 0, "prsMerged90d": 0, "replies": { "sampled": 1, "unanswered": 0, "medianDays": 10 } }, "updatedAt": "2026-11-07T18:20:55.898455647Z" } }, "edges": [ { "by": 22, "category": "reliability", "leads": "soniox-voice-cloning", "name": "Reliability", "reasons": { "a": "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.", "b": "Instatus page at status.soniox.com with five components in each of the US, Europe, Japan and India groups plus the Console, and a dated notice history (20). In the 90 days from 6 August the page posted three incidents, failed API key creation in the Console for 1 hour 10 minutes on 24 August, failed new EU real-time STT connections for 9 minutes on 25 August and Japan real-time STT overload for 45 minutes on 8 September, and none for October or November. None touches TTS or voices, so the record is clean for this listing, read as soniox-tts (30; was 20). TTS REST limits published, 100 requests a minute and 3 concurrent requests, and 20 voices per organisation (15). A 429 returns `limit_exceeded`; the OpenAPI file says to retry a 429 after a delay, retry a 408 and retry a 503 with backoff. No Retry-After and no idempotency key on voice creation, though a repeated create with the same name is refused because names are unique per project. Safe-retry guidance without idempotency keys earns 12, as soniox-tts (12; was 8). No SLA found (0). Voice cloning is part of the GA `tts-rt-v2` model (10). 20 + 30 + 15 + 12 + 0 + 10 = 87." }, "scores": { "a": 65, "b": 87 } }, { "by": 20, "category": "ergonomics", "leads": "soniox-voice-cloning", "name": "Agent ergonomics", "reasons": { "a": "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.", "b": "Responses are small voice objects, and the OpenAPI file says the list returns the voices in your project (22 of 25; was 20). The voices list pages with `limit` (up to 1,000) and a `cursor`, and a count endpoint returns the total, with no filters on custom voices (15 of 20; was 10). Errors say which to retry and which are terminal, and `voice_not_prepared` tells you to recompute (20). No idempotency key; voice processing has a per-model status to poll, and a duplicate name is refused (10 of 20). Two required fields and SDKs for Python, Node, the web and React (15). 22 + 15 + 20 + 10 + 15 = 82." }, "scores": { "a": 62, "b": 82 } }, { "by": 19, "category": "security", "leads": "soniox-voice-cloning", "name": "Security \u0026 auth", "reasons": { "a": "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.", "b": "Graded for voice cloning, 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, since the API returns audio and IDs rather than third-party text. Project API keys carry permissions per resource, with read and write levels for cloned voices, a missing permission returns 403 `permission_denied`, and temporary keys serve browser clients (30; was 25). The terms say Soniox doesn't verify the right to clone a voice, and there's no consent step or watermark, per the 1 October check, not re-read on 4 November (0 of 20). Audio is never used to improve models, and a voice's clip stays until you delete the voice (15). Per-request usage logs and every error's `request_id`, as soniox-tts reads them (10 of 15; was 8). SOC 2 Type 2 and ISO/IEC 27001:2022 stated; the Python SDK's SECURITY.md gives a disclosure route by email, GitHub, a maintainer or Discord; soniox.com/.well-known/security.txt answers 404 and no bug bounty was found, as soniox-tts (12 of 20; was 5). 30 + 0 + 15 + 10 + 12 = 67." }, "scores": { "a": 48, "b": 67 } }, { "by": 16, "category": "schema", "leads": "soniox-voice-cloning", "name": "Schema \u0026 documentation", "reasons": { "a": "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.", "b": "Soniox publishes an OpenAPI 3.1.0 file at docs.soniox.com/openapi.yaml (last modified 3 November 2026) that covers the voice endpoints, `GET` and `POST /v1/voices`, `GET /v1/voices/count`, `GET` and `DELETE /v1/voices/{voice_id}` and `POST /v1/voices/{voice_id}/recompute`, with typed `Voice` and per-model status schemas (25; was 0). llms.txt and `.mdx` pages, now on docs.soniox.com (10). The cloning guide explains clip quality, statuses and when to recompute after a model release (14 of 20). Create takes a name (1 to 128 characters, unique per project) and one file, both required, with documented size and length limits, and voice status is an enum (12 of 15). A shared error reference with stable `error_type` slugs, `request_id` and a `more_info` link (15). Versioned `/v1` paths and release notes with deprecation guidance on the models page, but no general changelog (10 of 15). 25 + 10 + 14 + 12 + 15 + 10 = 86." }, "scores": { "a": 70, "b": 86 } } ], "facts": [ { "a": "Model API", "b": "Model API", "name": "Kind" }, { "a": "Smallest, Inc.", "b": "Soniox", "name": "Vendor" }, { "a": "https://api.smallest.ai/waves/v1/voice-cloning", "b": "https://api.soniox.com/v1", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Pay per use", "b": "Pay per use", "name": "Pricing" }, { "a": "$17.50 per 1M characters", "b": "$0.0117 per minute of audio", "name": "Price for voice cloning" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under Smallest's Terms of Service. The `smallestai` Python SDK is on PyPI", "b": "Apache-2.0 (Python SDK)", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-29", "b": "2026-11-03", "name": "Last release" }, { "a": "no date given", "b": "2026-06-29", "name": "Terms last updated" }, { "a": "no date given", "b": "2026-06-29", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "yes", "b": "yes", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "none", "b": "12 stars, 22k npm/wk", "name": "Popularity" }, { "a": "none", "b": "3.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Soniox Voice Cloning scores 68.7 (B) on agent readiness against Smallest.ai Instant Voice Clone's 58 (C), and leads in 5 of 7 scored categories.", "question": "Which is better for AI agents, Smallest.ai Instant Voice Clone or Soniox Voice Cloning?" }, { "answer": "Both need an API key.", "question": "Do Smallest.ai Instant Voice Clone and Soniox Voice Cloning need an API key?" }, { "answer": "Yes. Smallest.ai Instant Voice Clone has a hosted endpoint at https://api.smallest.ai/waves/v1/voice-cloning and Soniox Voice Cloning at https://api.soniox.com/v1.", "question": "Can an agent call Smallest.ai Instant Voice Clone and Soniox Voice Cloning without installing anything?" } ], "goodFor": [ { "aheadOn": null, "also": [ "No incidents deducted, where Soniox Voice Cloning loses 3 points for them" ], "goodFor": "Teams already on Smallest's Lightning TTS or voice agents who want a clone from a short clip in one call.", "slug": "smallest-voice-clone", "watchFor": "The endpoint defaults to `lightning-v3.1`, whose clones stop working on 30 November 2026" }, { "aheadOn": [ "Reliability, 87 against 65", "Schema \u0026 documentation, 86 against 70", "Agent ergonomics, 82 against 62", "Security \u0026 auth, 67 against 48" ], "also": null, "goodFor": "A quick clone that has to speak many languages, from a vendor with clean data terms.", "slug": "soniox-voice-cloning", "watchFor": "No consent capture or speaker verification, and the terms say so" } ], "history": { "smallest-voice-clone": null, "soniox-voice-cloning": [ { "causes": [ "product", "evidence", "correction", "event" ], "date": "2026-11-04", "delta": 10.1, "from": 58.6, "fromGrade": "C", "to": 68.7, "toGrade": "B" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.2, "from": 58.8, "fromGrade": "C", "to": 58.6, "toGrade": "C" } ] }, "job": { "capability": "voice.clone", "name": "Voice cloning" }, "others": [ { "json": "https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-smallest-voice-clone.json", "title": "Cartesia Voice Cloning API + MCP vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-soniox-voice-cloning.json", "title": "Cartesia Voice Cloning API + MCP vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-smallest-voice-clone.json", "title": "ElevenLabs Voice Cloning and Voice Design API vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-soniox-voice-cloning.json", "title": "ElevenLabs Voice Cloning and Voice Design API vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-smallest-voice-clone.json", "title": "Fish Audio Voice Cloning API vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-soniox-voice-cloning.json", "title": "Fish Audio Voice Cloning API vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-smallest-voice-clone.json", "title": "Gradium Voice Cloning and Voice Design vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-soniox-voice-cloning.json", "title": "Gradium Voice Cloning and Voice Design vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/hume-voice-cloning-vs-smallest-voice-clone.json", "title": "Hume Octave Voice Design and Cloning + MCP vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/hume-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/hume-voice-cloning-vs-soniox-voice-cloning.json", "title": "Hume Octave Voice Design and Cloning + MCP vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/hume-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone.json", "title": "Inworld Instant Voice Cloning vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-soniox-voice-cloning.json", "title": "Inworld Instant Voice Cloning vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-smallest-voice-clone.json", "title": "MiniMax Voice Clone and Voice Design vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-soniox-voice-cloning.json", "title": "MiniMax Voice Clone and Voice Design vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/murf-voice-cloning-vs-smallest-voice-clone.json", "title": "Murf Voice Cloning API vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/murf-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/murf-voice-cloning-vs-soniox-voice-cloning.json", "title": "Murf Voice Cloning API vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/murf-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/playht-voice-cloning-vs-smallest-voice-clone.json", "title": "PlayHT Voice Cloning API vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/playht-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/playht-voice-cloning-vs-soniox-voice-cloning.json", "title": "PlayHT Voice Cloning API vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/playht-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-smallest-voice-clone.json", "title": "Resemble AI Voice Cloning API vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-soniox-voice-cloning.json", "title": "Resemble AI Voice Cloning API vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-speechify-voice-cloning.json", "title": "Smallest.ai Instant Voice Clone vs Speechify API Voice Cloning", "url": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-speechify-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-ultravox-voice-cloning.json", "title": "Smallest.ai Instant Voice Clone vs Ultravox Voice Cloning", "url": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-ultravox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-voicestudio.json", "title": "Smallest.ai Instant Voice Clone vs VoiceStudio", "url": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-voicestudio" }, { "json": "https://www.anchorterminal.com/compare/soniox-voice-cloning-vs-speechify-voice-cloning.json", "title": "Soniox Voice Cloning vs Speechify API Voice Cloning", "url": "https://www.anchorterminal.com/compare/soniox-voice-cloning-vs-speechify-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/soniox-voice-cloning-vs-ultravox-voice-cloning.json", "title": "Soniox Voice Cloning vs Ultravox Voice Cloning", "url": "https://www.anchorterminal.com/compare/soniox-voice-cloning-vs-ultravox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/soniox-voice-cloning-vs-voicestudio.json", "title": "Soniox Voice Cloning vs VoiceStudio", "url": "https://www.anchorterminal.com/compare/soniox-voice-cloning-vs-voicestudio" } ], "panel": null, "scores": [ { "by": 22, "edge": "soniox-voice-cloning", "key": "reliability", "name": "Reliability", "smallest-voice-clone": 65, "soniox-voice-cloning": 87, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 16, "edge": "soniox-voice-cloning", "key": "schema", "name": "Schema \u0026 documentation", "smallest-voice-clone": 70, "soniox-voice-cloning": 86, "weight": 13 }, { "by": 20, "edge": "soniox-voice-cloning", "key": "ergonomics", "name": "Agent ergonomics", "smallest-voice-clone": 62, "soniox-voice-cloning": 82, "weight": 13 }, { "by": 19, "edge": "soniox-voice-cloning", "key": "security", "name": "Security \u0026 auth", "smallest-voice-clone": 48, "soniox-voice-cloning": 67, "weight": 14 }, { "by": 0, "edge": "", "key": "payments", "name": "Payments \u0026 pricing", "smallest-voice-clone": 20, "soniox-voice-cloning": 20, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 3, "edge": "soniox-voice-cloning", "key": "maintenance", "name": "Maintenance \u0026 community", "smallest-voice-clone": 72, "soniox-voice-cloning": 75, "weight": 7 }, { "by": 1, "edge": "smallest-voice-clone", "key": "transparency", "name": "Transparency \u0026 trust", "smallest-voice-clone": 72, "soniox-voice-cloning": 71, "weight": 7 } ], "summary": "Soniox Voice Cloning scores 68.7 (B) on agent readiness against Smallest.ai Instant Voice Clone's 58 (C), and leads in 5 of 7 scored categories. Both do voice cloning.", "tasks": null, "tutorials": [ { "title": "Prepare a project voice for Soniox TTS", "tool": "soniox-voice-cloning", "url": "https://www.anchorterminal.com/tutorials/soniox-voice-cloning/" } ], "verdicts": { "smallest-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.", "soniox-voice-cloning": "One API call and a clip of up to 2 minutes, with an OpenAPI file covering create, list, recompute and delete. No consent capture or speaker verification, and the terms say so. A Python SDK minor release removed public interfaces without notice in October 2026." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-soniox-voice-cloning", "json": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-soniox-voice-cloning.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-soniox-voice-cloning.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-soniox-voice-cloning.min.md" }, "markdown": "Soniox Voice Cloning scores 68.7 (B) on agent readiness against Smallest.ai Instant Voice Clone's 58 (C), and leads in 5 of 7 scored categories. Both do voice cloning.\n\n- 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\n- Soniox Voice Cloning: grade B, 68.7/100, rank #274 of 1486. Markdown https://www.anchorterminal.com/tools/soniox-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/soniox-voice-cloning.json\n- Best voice cloning and custom voice APIs for AI agents: https://www.anchorterminal.com/best/voice-cloning/index.md\n- All 133 cloning comparisons: https://www.anchorterminal.com/compare/voice-cloning/index.md\n\n## Which one, for what\n\n### Smallest.ai Instant Voice Clone (C)\n\nGood for: Teams already on Smallest's Lightning TTS or voice agents who want a clone from a short clip in one call.\n\nAlso in its favour:\n- No incidents deducted, where Soniox Voice Cloning loses 3 points for them\n\nWatch for: The endpoint defaults to `lightning-v3.1`, whose clones stop working on 30 November 2026\n\n### Soniox Voice Cloning (B)\n\nGood for: A quick clone that has to speak many languages, from a vendor with clean data terms.\n\nAhead on:\n- Reliability, 87 against 65\n- Schema \u0026 documentation, 86 against 70\n- Agent ergonomics, 82 against 62\n- Security \u0026 auth, 67 against 48\n\nWatch for: No consent capture or speaker verification, and the terms say so\n\n\n## Why the edge\n\n### Reliability: Soniox Voice Cloning +22\n\n- 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.\n- Soniox Voice Cloning (87): Instatus page at status.soniox.com with five components in each of the US, Europe, Japan and India groups plus the Console, and a dated notice history (20). In the 90 days from 6 August the page posted three incidents, failed API key creation in the Console for 1 hour 10 minutes on 24 August, failed new EU real-time STT connections for 9 minutes on 25 August and Japan real-time STT overload for 45 minutes on 8 September, and none for October or November. None touches TTS or voices, so the record is clean for this listing, read as soniox-tts (30; was 20). TTS REST limits published, 100 requests a minute and 3 concurrent requests, and 20 voices per organisation (15). A 429 returns `limit_exceeded`; the OpenAPI file says to retry a 429 after a delay, retry a 408 and retry a 503 with backoff. No Retry-After and no idempotency key on voice creation, though a repeated create with the same name is refused because names are unique per project. Safe-retry guidance without idempotency keys earns 12, as soniox-tts (12; was 8). No SLA found (0). Voice cloning is part of the GA `tts-rt-v2` model (10). 20 + 30 + 15 + 12 + 0 + 10 = 87.\n\n### Agent ergonomics: Soniox Voice Cloning +20\n\n- 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.\n- Soniox Voice Cloning (82): Responses are small voice objects, and the OpenAPI file says the list returns the voices in your project (22 of 25; was 20). The voices list pages with `limit` (up to 1,000) and a `cursor`, and a count endpoint returns the total, with no filters on custom voices (15 of 20; was 10). Errors say which to retry and which are terminal, and `voice_not_prepared` tells you to recompute (20). No idempotency key; voice processing has a per-model status to poll, and a duplicate name is refused (10 of 20). Two required fields and SDKs for Python, Node, the web and React (15). 22 + 15 + 20 + 10 + 15 = 82.\n\n### Security \u0026 auth: Soniox Voice Cloning +19\n\n- 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.\n- Soniox Voice Cloning (67): Graded for voice cloning, 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, since the API returns audio and IDs rather than third-party text. Project API keys carry permissions per resource, with read and write levels for cloned voices, a missing permission returns 403 `permission_denied`, and temporary keys serve browser clients (30; was 25). The terms say Soniox doesn't verify the right to clone a voice, and there's no consent step or watermark, per the 1 October check, not re-read on 4 November (0 of 20). Audio is never used to improve models, and a voice's clip stays until you delete the voice (15). Per-request usage logs and every error's `request_id`, as soniox-tts reads them (10 of 15; was 8). SOC 2 Type 2 and ISO/IEC 27001:2022 stated; the Python SDK's SECURITY.md gives a disclosure route by email, GitHub, a maintainer or Discord; soniox.com/.well-known/security.txt answers 404 and no bug bounty was found, as soniox-tts (12 of 20; was 5). 30 + 0 + 15 + 10 + 12 = 67.\n\n### Schema \u0026 documentation: Soniox Voice Cloning +16\n\n- 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.\n- Soniox Voice Cloning (86): Soniox publishes an OpenAPI 3.1.0 file at docs.soniox.com/openapi.yaml (last modified 3 November 2026) that covers the voice endpoints, `GET` and `POST /v1/voices`, `GET /v1/voices/count`, `GET` and `DELETE /v1/voices/{voice_id}` and `POST /v1/voices/{voice_id}/recompute`, with typed `Voice` and per-model status schemas (25; was 0). llms.txt and `.mdx` pages, now on docs.soniox.com (10). The cloning guide explains clip quality, statuses and when to recompute after a model release (14 of 20). Create takes a name (1 to 128 characters, unique per project) and one file, both required, with documented size and length limits, and voice status is an enum (12 of 15). A shared error reference with stable `error_type` slugs, `request_id` and a `more_info` link (15). Versioned `/v1` paths and release notes with deprecation guidance on the models page, but no general changelog (10 of 15). 25 + 10 + 14 + 12 + 15 + 10 = 86.\n\n## Score by category\n\n| Category | Weight | Smallest.ai Instant Voice Clone | Soniox Voice Cloning | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 65 | 87 | Soniox Voice Cloning +22 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 70 | 86 | Soniox Voice Cloning +16 |\n| Agent ergonomics | 13% (16.2 this run) | 62 | 82 | Soniox Voice Cloning +20 |\n| Security \u0026 auth | 14% (17.5 this run) | 48 | 67 | Soniox Voice Cloning +19 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 20 | 20 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 72 | 75 | Soniox Voice Cloning +3 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 72 | 71 | Smallest.ai Instant Voice Clone +1 |\n| Negative events | ≤15 | 0 | -3 | |\n| **Total** | | **58 · C** | **68.7 · B** | |\n\n## Facts side by side\n\n| Fact | Smallest.ai Instant Voice Clone | Soniox Voice Cloning |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | Smallest, Inc. | Soniox |\n| Hosted endpoint | `https://api.smallest.ai/waves/v1/voice-cloning` | `https://api.soniox.com/v1` |\n| Transports | HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Pay per use | Pay per use |\n| Price for voice cloning | $17.50 per 1M characters | $0.0117 per minute of audio |\n| x402 | no | no |\n| Licence | Proprietary service under Smallest's Terms of Service. The `smallestai` Python SDK is on PyPI | Apache-2.0 (Python SDK) |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-29 | 2026-11-03 |\n| Terms last updated | no date given | 2026-06-29 |\n| Privacy policy last updated | no date given | 2026-06-29 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | not found in the text |\n| Terms restrict benchmarking | not found in the text | yes |\n| Terms or service can change without notice | yes | yes |\n| Arbitration or class-action waiver | yes | not found in the text |\n| Popularity | none | 12 stars, 22k npm/wk |\n| Agent reviews | none | 3.5/5 (2) |\n\n## How the scores have moved\n\n### Smallest.ai Instant Voice Clone\n\nNo score change since it was listed.\n\n### Soniox Voice Cloning\n\n- +10.1 on 4 November 2026 (C to B): product, new evidence, correction, negative event\n- -0.2 on 8 October 2026: checklist\n\n## Verdicts\n\n**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.\n\n**Soniox Voice Cloning.** One API call and a clip of up to 2 minutes, with an OpenAPI file covering create, list, recompute and delete. No consent capture or speaker verification, and the terms say so. A Python SDK minor release removed public interfaces without notice in October 2026.\n\n## Before you call either\n\n### Smallest.ai Instant Voice Clone\n\n1. Always pass `model=lightning-v3.1-pro`. The default `lightning-v3.1` clones stop working on 30 November 2026\n2. 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\n3. Before retrying a `voice_clone_timeout`, list clones by `displayName` so a retry doesn't create a duplicate\n4. Send the server API key, not an access token. The cloning endpoint refuses short-lived tokens\n5. Keep TTS calls from a clone to one at a time on the self-serve plan and back off on 429\n\n### Soniox Voice Cloning\n\n1. Poll the voice until the target model's status is `ready` before using it in TTS\n2. On `voice_not_prepared` call recompute, don't retry the TTS request\n3. Don't retry `voice_failed` even though it's a 503. Create a new voice from a better clip\n4. Use a key from the project that owns the voice, voices are per project\n5. Keep the clip under 2 minutes and 35 MB, longer fails with `voice_audio_too_long`\n6. Send the API key with the WebSocket connection, not in the config message, before 15 January 2027\n\n## Tutorials\n\n- [Prepare a project voice for Soniox TTS](https://www.anchorterminal.com/tutorials/soniox-voice-cloning/), for Soniox Voice Cloning\n\n## Questions\n\n### Which is better for AI agents, Smallest.ai Instant Voice Clone or Soniox Voice Cloning?\n\nSoniox Voice Cloning scores 68.7 (B) on agent readiness against Smallest.ai Instant Voice Clone's 58 (C), and leads in 5 of 7 scored categories.\n\n### Do Smallest.ai Instant Voice Clone and Soniox Voice Cloning need an API key?\n\nBoth need an API key.\n\n### Can an agent call Smallest.ai Instant Voice Clone and Soniox Voice Cloning without installing anything?\n\nYes. Smallest.ai Instant Voice Clone has a hosted endpoint at https://api.smallest.ai/waves/v1/voice-cloning and Soniox Voice Cloning at https://api.soniox.com/v1.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/smallest-voice-clone-vs-soniox-voice-cloning.json, and with the fewest tokens: https://www.anchorterminal.com/compare/smallest-voice-clone-vs-soniox-voice-cloning.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"smallest-voice-clone\", \"b\": \"soniox-voice-cloning\"}`. From a terminal: `anchor compare smallest-voice-clone soniox-voice-cloning`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/smallest-voice-clone.json and https://www.anchorterminal.com/api/v1/tools/soniox-voice-cloning.json\n\n## Other comparisons with Smallest.ai Instant Voice Clone or Soniox Voice Cloning\n\n- [Cartesia Voice Cloning API + MCP vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-smallest-voice-clone.md)\n- [Cartesia Voice Cloning API + MCP vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-soniox-voice-cloning.md)\n- [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)\n- [ElevenLabs Voice Cloning and Voice Design API vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-soniox-voice-cloning.md)\n- [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)\n- [Fish Audio Voice Cloning API vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-soniox-voice-cloning.md)\n- [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)\n- [Gradium Voice Cloning and Voice Design vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-soniox-voice-cloning.md)\n- [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)\n- [Hume Octave Voice Design and Cloning + MCP vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/hume-voice-cloning-vs-soniox-voice-cloning.md)\n- [Inworld Instant Voice Cloning vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone.md)\n- [Inworld Instant Voice Cloning vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-soniox-voice-cloning.md)\n- [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)\n- [MiniMax Voice Clone and Voice Design vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-soniox-voice-cloning.md)\n- [Murf Voice Cloning API vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/murf-voice-cloning-vs-smallest-voice-clone.md)\n- [Murf Voice Cloning API vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/murf-voice-cloning-vs-soniox-voice-cloning.md)\n- [PlayHT Voice Cloning API vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-smallest-voice-clone.md)\n- [PlayHT Voice Cloning API vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-soniox-voice-cloning.md)\n- [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)\n- [Resemble AI Voice Cloning API vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-soniox-voice-cloning.md)\n- [Smallest.ai Instant Voice Clone vs Speechify API Voice Cloning](https://www.anchorterminal.com/compare/smallest-voice-clone-vs-speechify-voice-cloning.md)\n- [Smallest.ai Instant Voice Clone vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/smallest-voice-clone-vs-ultravox-voice-cloning.md)\n- [Smallest.ai Instant Voice Clone vs VoiceStudio](https://www.anchorterminal.com/compare/smallest-voice-clone-vs-voicestudio.md)\n- [Soniox Voice Cloning vs Speechify API Voice Cloning](https://www.anchorterminal.com/compare/soniox-voice-cloning-vs-speechify-voice-cloning.md)\n- [Soniox Voice Cloning vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/soniox-voice-cloning-vs-ultravox-voice-cloning.md)\n- [Soniox Voice Cloning vs VoiceStudio](https://www.anchorterminal.com/compare/soniox-voice-cloning-vs-voicestudio.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-07", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Smallest.ai Instant Voice Clone vs Soniox Voice Cloning", "url": "" } ], "description": "Soniox Voice Cloning scores 68.7 (B) to Smallest.ai Instant Voice Clone's 58 (C) for voice cloning. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Smallest.ai Instant Voice Clone C 58", "Soniox Voice Cloning B 68.7", "scores" ], "h1": "Smallest.ai Instant Voice Clone vs Soniox Voice Cloning", "image": "https://www.anchorterminal.com/assets/og/default.png", "path": "/compare/smallest-voice-clone-vs-soniox-voice-cloning", "published": "2026-10-01", "section": "tools", "title": "Smallest.ai Instant Voice Clone vs Soniox Voice Cloning (2026)", "toc": null, "updated": "2026-11-07", "url": "https://www.anchorterminal.com/compare/smallest-voice-clone-vs-soniox-voice-cloning" }, "tokens": { "markdown": 4950, "slim": 2580 }, "version": 1 }