Inworld Instant Voice Cloning vs MiniMax Voice Clone and Voice Design

Inworld Instant Voice Cloning 68

Read as a model, on the lines inworld-tts and cartesia-voice-cloning use (recency 30, dated releases 10, deprecation notice 10, support 15, SDKs 15, health 10). The 9 October draft used the tool lines and gave 75. @inworld/cli 1.5.0, whose MCP server carries clone_voice, on 29 October 2026, after 1.4.0 (13 October), 1.4.1 (23 October), 1.4.2 and 1.4.3 (25 October) (30). Dated TTS release notes on 9 August and 11 September 2026, and none for the 28 October model update or for the Voice API (10). inworld-tts-1 was discontinued on 15 June 2026 with requests routed to newer models, and clones made before 15 August keep a 15-second prompt, with no notice period stated (5 of 10). A public changelog, a Discord server and support@inworld.ai, with no evidence read of how they answer (8 of 15). @inworld/tts 1.1.1 dates from 6 May 2026 (10 of 15). The CLI is current, but the repositories named in its npm metadata aren't public (5 of 10). 30+10+5+8+10+5 = 68.

MiniMax Voice Clone and Voice Design 38

The newest dated change that touches this product is minimax-mcp-js 0.0.18 on 21 August 2026 (per the 8 October npm reading), the day the MCP-JS repository merged its last change, and the Python server's version 0.0.19 commit of 20 August, 75 days before 4 November. Neither repository has a commit after 21 August. The newest speech model, Speech 2.8, is still dated 23 January 2026 on the model release page (20 of 30). Two package releases for one change in the last 90 days, and no dated API entries (0). The API release notes still stop at 28 October 2025. Support is by email and Discord, and the MCP repository's issue replies were not read (6 of 15). No official SDK for speech. The MCP servers were updated in August 2026 and include voice_clone and voice_design (8 of 15). The Python server has tests and moved to version 2 of the MCP SDK in August, with no CI workflow in the repository (4 of 10). Total 38.

Inworld Instant Voice Cloning 40

No x402, MPP or L402 (0). The pricing page, unread on 9 October and read on 6 November, publishes per-character rates for speech from a clone, $25 per million characters on TTS-2 and $15 on TTS-2 Flash on the free plan, and no charge for creating a clone (20, was 10). The On-Demand plan is free with 100 custom voices and instant cloning, and no card is asked for (20). inworld login opens a browser and signup is a human flow. The CLI mints keys only after that (0). 0+20+20+0 = 40.

MiniMax Voice Clone and Voice Design 20

No x402, MPP or L402 (0). Per-unit prices are public, $1.50 a cloned voice, $3 a designed voice and $60 to $100 per million characters of speech (20). No free allowance for cloning or design is published. The rate limits page mentions a free tier without defining it (0). A person signs up in a browser, funds a balance and completes verification before the first clone (0).

Inworld Instant Voice Cloning 55

Graded for voice cloning as the other listings in this category were, 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. Revocable workspace keys that are read-only for the Voice API until a write toggle is set, Realtime-only keys and single-use tokens, sent in a header (25 of 30). The API has no consent or verification field and no watermark was found. Only the Portal asks the user to confirm rights, and the Terms (11 June 2025), now read, have no clause on cloned voices. The write toggle keeps a default key from cloning (6 of 20). The Terms say Inworld won't train generally available models on non-public Materials except feedback and trust and safety content, while the Privacy Notice lists training among its uses. Zero Data Retention excludes cloning samples and no retention period for them is published (7 of 15, was 4). Usage is attributed per key in the dashboard and an experimental usage records endpoint exists from the Builder plan. No audit log found (7 of 15). GDPR and SOC 2 Type II are stated on every plan on the pricing page, and the security page links a vulnerability report form. No security.txt (404 per the 30 October inworld-tts check) and no bug bounty found (10 of 20, was 8). 25+6+7+7+10 = 55.

MiniMax Voice Clone and Voice Design 39

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, as on the other listings in this category. Plain API keys from the console with no scopes found, and the docs say publicly leaked keys may be disabled (20 of 30). Cloning requires individual or enterprise verification of the account, input passes a content safety check, and two optional controls exist, a transcript match (text_validation) and a watermark tone (aigc_watermark, off by default). No field records the speaker's consent. The terms only have the client confirm it obtained any required consent from end users for the data it submits, with nothing on voices or likeness (8 of 20). The terms (effective 30 March 2026), read on 4 November from the document text the page carries, let MiniMax use input and generated content to provide, maintain, develop and improve its services, with no opt-out found, and the privacy policy (updated 30 March 2026) says input may include voice and rules out only training to profile or target consumers. The docs state that unused voices are deleted after 7 days and a delete call exists (5 of 15). Responses carry usage_characters for reconciliation and voices can be listed, with no audit log found (6 of 15). No security.txt, disclosure policy, bug bounty or certification found, and an issue opened on the MCP repository on 25 August 2026 asks for a private disclosure contact (0 of 20). Total 39.

Inworld Instant Voice Cloning 64

No OpenAPI file is linked from the docs or llms.txt, re-read on 6 November. The MCP server has typed inputs on all 40 tools, which earns part of the line (10 of 25). llms.txt, llms-full.txt and Markdown twins (10). The guides say when to use instant cloning, Professional Voice Cloning or Voice Design, and the reference warns which fields are ignored (15 of 20). Required fields and base64 audio are typed, and a new languageCode string is validated against the catalogue with INVALID_ARGUMENT, while size and length limits sit in prose and the MCP tool still states different ones (10 of 15). Examples in curl, Python, JavaScript and the CLI, with one error response shown and no error list for the Voice API (9 of 15). A /v1/ path and dated TTS release notes, newest 11 September, with no changelog for the Voice API itself (10 of 15). 10+10+15+10+9+10 = 64.

MiniMax Voice Clone and Voice Design 78

OpenAPI 3.1 files for cloning, upload, voice design and voice management (25). llms.txt and a Markdown copy of every docs page (10). Field descriptions state purpose, limits and billing effects, with little on when to choose cloning over design (13 of 20). Enums for model, language and voice type, a 0 to 1 range on accuracy and length caps, while the voice_id rules sit in prose and the file_id description carries a sentence that belongs to clone_prompt (12 of 15). Request and response examples throughout and a table of 24 error codes, but only a 200 response is specified and the example response uses fields the schema does not define (10 of 15). Paths are versioned under /v1. The API release notes stop at 28 October 2025 and omit text_validation and aigc_watermark (8 of 15).

Inworld Instant Voice Cloning 64

The clone response echoes up to 15 seconds of processed audio as base64 with no way to leave it out. The MCP tool returns a compact result, but the server loads 40 tools with no toolsets, registering only those the credentials can call (13 of 25). Voice lists take an AIP-160 filter, pageSize, pageToken and orderBy, including source = "IVC", and a capacity endpoint reports used and maximum custom voices (20). Errors are a numeric code, a message and details, and the one example reads clearly, but no list is documented for the Voice API (12 of 20). No idempotency key, no MCP annotations in the 1.5.0 package, and the SDKs retry 5xx and network errors twice by default (4 of 20). Two required fields, language auto-detection, and official Python and Node.js SDKs (15). 13+20+12+4+15 = 64.

MiniMax Voice Clone and Voice Design 56

The clone call returns a preview URL and billing counts, but voice design returns preview audio as hex inside the JSON body, and listing with voice_type set to all returns the 300+ system voices (15 of 25). POST /v1/get_voice filters by voice type and has no pagination (10 of 20). Errors come as numeric codes in base_resp with a short remedy for each, several of them specific to cloning, inside a response documented only as 200 (13 of 20). No idempotency key. A repeated clone with the same voice_id fails with 2039 instead of creating a second voice, the fee applies only on first synthesis, and the MCP tools carry no read-only or destructive annotations (10 of 20). Two required fields per call. No official SDK for speech, with MCP servers in Python and JavaScript and an official CLI that does not cover cloning (8 of 15).