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Inworld STT

by Inworld AI Model API in Speech-to-text

Theai, Inc. dba Inworld AI · inworld.ai · status page · who's behind it

Inworld's speech-to-text API runs its inworld/inworld-stt-1 model in 30 languages over synchronous HTTP, bidirectional WebSocket streaming and asynchronous jobs, returning Voice Profile signals (age, emotion, pitch, accent) and turn detection alongside the transcript.

Best for Low-cost live transcription for voice agents, with speaker traits.

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More from Inworld AI Inworld Realtime TTS-2 (TTS) · Inworld Realtime API (Voice agents) · Inworld Instant Voice Cloning (Cloning)

Assessment. Inworld STT costs $0.10 to $0.15 an hour with 400 free minutes, and covers files, live streams and async jobs in 30 languages with Voice Profile signals. There is no machine-readable spec, no public STT changelog and no readable status history, and diarisation is still experimental.

Facts

Access how an agent reaches and pays for it
Transport
HTTP, websocket
Auth
API key
Pricing
Pay per use
x402
No
Licence
not stated
Tools exposed
0
Where it lives packages, source, docs and releases
Packages
npm @inworld/cli
llms.txt
published
Last release
From our research 7 facts checked against the vendor's pages
Surface listed
The STT API at api.inworld.ai/stt/v1, read from docs.inworld.ai (llms.txt, Markdown pages, API reference), inworld.ai/pricing and inworld.ai/speech-to-text on 6 November 2026, with terms, privacy, security and status as read for inworld-tts on 4 November. No account was made and no request was sent
Model
inworld/inworld-stt-1. The billing page also bills third-party STT models through the same API by the duration the provider reports, such as groq/whisper-large-v3 with a ten-second minimum
Languages
30, with language as a hint the model may not follow; BCP-47 codes are reduced to the base code
Audio
LINEAR16, MP3, OGG_OPUS, FLAC or AUTO_DETECT, inline Base64 or multipart upload on the sync route
Signals
Voice Profile (age, emotion, pitch, vocal style, accent), turn detection automatic or manual, word timestamps and experimental diarisation
Same company
Inworld TTS is listed as inworld-tts. The Realtime API, listed as inworld-realtime, bills its speech recognition as STT on this model
MCP server
Ships inside @inworld/cli (1.5.0, 29 October 2026, MIT) as inworld mcp, with an STT transcription tool among TTS, voice and LLM tools

Facts verified 6 November 2026 from vendor docs, repositories and package registries. JSON · Markdown

Strengths

  • $0.15 an hour on the free plan and $0.10 on paid plans, billed per second, with 400 free minutes
  • Sync, WebSocket streaming and async jobs on one model, with turn detection and Voice Profile signals
  • Browser tokens travel in a WebSocket subprotocol, not the URL
  • Zero data retention keeps audio and transcripts in memory, and the docs include it from the Developer plan
  • llms.txt, Markdown twins and a docs MCP server

Weaknesses

  • No OpenAPI or other machine-readable contract
  • The STT release notes path asks for a login, so changes to the model aren't publicly dated
  • Status history couldn't be read, and an SLA exists only for Enterprise
  • Speaker diarisation is experimental and async jobs run on a v1alpha operations route
  • Docs and the STT product page disagree on which plans include zero data retention

Before you call it notes for agents

  1. Send the Base64 credential as-is in Authorization: Basic; don't encode it again
  2. Wrap the first WebSocket message in transcribeConfig, because a malformed first frame closes the socket with 1005 and no error
  3. Use POST /stt/v1/transcribe:async for files over about 16 MB and collect the transcript within 7 days
  4. Retry 429 or gRPC code 8 with exponential backoff and jitter, and stay within the plan's streaming concurrency
  5. Stop sending audio when nobody speaks, since streams are billed for every second sent

Who's behind it provenance 75/100

  • Legal entity namedTheai, Inc. dba Inworld AI20/20
  • Domain ageinworld.ai, no registry record we could read0/15
  • Endpoint on the vendor's domaininworld.ai15/15
  • Terms of serviceread, states 6 of the 7 things a reader expects9.1/10
  • Privacy policyread, states 7 of the 8 things a reader expects9.3/10
  • Status pagestatus.inworld.ai10/10
  • Changelogpublished10/10
  • security.txtnot found0/10
  • People named3 named with their role, none with a public profile7/10
  • Support routea support address, help pages, a community5/5

Terms and privacy, as read

Terms of service dated 2025-06-11, states 6 of 7

TL;DR Dated 2025-06-11. States 6 of the 7 things a reader expects, and we didn't find a service level. The rules found no clause to flag.

Gives the date it was last updated Last updated 2025-06-11
Effective Date: June 11, 2025

Without a date nobody can tell which version they agreed to.

Names the governing law or courts Disputes go to the courts of Santa Clara, California
Except as provided in the dispute resolution section above, all claims arising out of or relating to these Terms will be brought exclusively in the federal or state courts of Santa Clara, California.

Says where a dispute would be heard and under whose law.

States a limit on its liability Capped at the greater of $100 and the fees paid in the 12 months before the claim
OUR AGGREGATE LIABILITY UNDER THESE TERMS WILL NOT EXCEED THE GREATER OF: (A) THE AMOUNT YOU PAID FOR THE SERVICE THAT GAVE RISE TO THE CLAIM DURING THE 12 MONTHS BEFORE THE LIABILITY AROSE OR (B) ONE HUNDRED DOLLARS ($100).

Says the most the vendor would owe if the service causes a loss.

Says how the agreement or account can be ended
If your payment cannot be completed, we may downgrade your account or suspend your access to our Services until payment is received.

Says when the vendor can cut off access and what notice it gives.

Says how changes to the terms are announced Gives 30 days of notice before a change
If we increase our subscription prices, we will give you at least 30 days' notice and any price increase will take effect on your next renewal so that you can cancel if you do not agree to the price increase.

Says whether a customer hears about a change before it binds them.

Lists what users may not do
YOU ACCEPT AND AGREE THAT ANY USE OF OUTPUTS FROM OUR SERVICE IS AT YOUR SOLE RISK AND YOU WILL NOT RELY ON OUTPUT AS A SOURCE OF TRUTH OR FACTUAL INFORMATION, OR AS A SUBSTITUTE FOR PROFESSIONAL ADVICE.

The acceptable-use rules an agent acting for a user has to stay inside.

Refers to a service level or uptime commitment

Not found in the text.

Says whether availability is promised and where the promise is written.

The document · read 2026-10-30 · 2,623 words

Privacy policy dated 2026-01-18, states 7 of 8, 1 to know

TL;DR Dated 2026-01-18. States 7 of the 8 things a reader expects, and we didn't find where data goes. To know before relying on it, selling or sharing data for advertising.

Says it sells personal data or shares it for advertising
Some of the activities described in this section may constitute “targeted advertising,” “sharing,” or “selling” under certain laws.

Personal data is passed to advertising partners, or the document says its sharing may count as a sale under privacy law.

Gives the date it was last updated Last updated 2026-01-18
Last Updated: January 18, 2026

Without a date nobody can tell which version applied when data was collected.

Says what personal data is collected
This Privacy Notice applies to information we collect when you access or use our websites and any related services (collectively, the “Services”), or when you otherwise interact with us, such as through our customer support channels.

The basic statement a privacy policy exists to make.

Says how long data is kept For as long as needed, with no period named
We store personal information for as long as necessary to carry out the purposes for which we originally collected it, satisfy our legal requirements, or for other business purposes explained in this Privacy Notice.

Says when data sent to the service is deleted.

Says who else receives the data
Vendors: we disclose information to vendors, service providers, contractors and consultants that need this information to provide services to us, such as companies that assist us with web hosting, payment processing, fraud prevention, customer service, data enrichment, analytics, and marketing and advertising.

Names the sub-processors or service providers the data is passed to, or where they are listed.

Says whether personal data is sold or shared for advertising Says it does not sell personal data
You can also adjust certain cookie settings by selecting “Do Not Sell or Share My Personal Information” within the cookie icon at the bottom-left corner of our website.

A plain statement either way.

Says what rights people have over their data
You have the right to opt out of sharing, sales, and targeted advertising by:

Access, correction, deletion and objection, and how to use them.

Gives a privacy contact privacy@inworld.ai
Depending on where you reside, you may opt out of these disclosures by emailing privacy@inworld.ai.

An address or officer to send a request to.

Says where data is transferred or stored

Not found in the text.

The countries data goes to and the safeguard used.

The document · read 2026-10-30 · 3,236 words

A reading by a fixed set of rules, each answered with the vendor's own sentence. It isn't legal advice, a rule can miss a clause or misread one, and the document itself is what binds. How it's read and scored.

The Terms of Service (effective 11 June 2025) are an agreement with Theai, Inc. dba Inworld AI under California law, with courts in Santa Clara. The Privacy Notice (last updated 18 January 2026) names Theai, Inc.

inworld.ai/.well-known/security.txt returns 404. The security page links a vulnerability report form.

status.inworld.ai runs the open-source issue-status app, which draws incidents from GitHub issues in inworld-ai/inworld-issue-status. Its history wasn't read, because GitHub's robots.txt couldn't be read from our environment.

inworld.ai's robots.txt allows Claude agents on the paths read and sets Content-Signal: ai-train=no, search=yes, ai-input=no. docs.inworld.ai has no such signal.

The domain's registration date wasn't established, because the RDAP lookup failed.

firstReleased is left empty. No dated STT launch was found, and the STT release notes path asks for a Portal login.

Checked 2026-11-06 against the vendor's own pages and the domain registry. Provenance is half of Transparency & trust.

Humans behind the project who makes it and where to get help

Key people

Inworld AI (Theai, Inc.) on LinkedIn @inworld GitHub

Raised over $100M in total, as of August 2023 source

Valuation over $500M as announced (the source doesn't say pre- or post-money), August 2023 round led by Lightspeed, August 2023 source

Backed bySection 32,Intel,Lightspeed Venture Partners,Founders Fund,Accelerator Investments LLC,First Spark Ventures,Kleiner Perkins,BITKRAFT Ventures,CRV,Microsoft,Micron,LG,SK Telecom,The Venture Reality Fund,HTC,Meta,Stanford University,Samsung,The Walt Disney Company,NTT DOCOMO

Researched 6 November 2026 from public pages. Copied on 6 November 2026 from the inworld-tts listing's humans file (checked 30 October 2026), since the company is the same. Inworld's Realtime TTS-2 page, read 30 October 2026, quotes Kylan Gibbs as CEO of Inworld AI. Inworld's Series A release of 23 August 2022, as published by Intel Capital, names Ilya Gelfenbeyn, Michael Ermolenko and Kylan Gibbs as founders and Ilya Gelfenbeyn as CEO at the time. No about or team page was found in the inworld.ai sitemap, so the present roles of the other two founders aren't established and the roster may be incomplete. No personal accounts are linked from Inworld's pages, so none are listed. The 28 October 2026 Reasoning post is signed by the Inworld TTS team. The ultravox listing's humans file records Inworld's announcement of 30 September 2026 that it acquired Ultravox. Investors come from the Series A release as published by Intel Capital and from The SaaS News report of the August 2023 round led by Lightspeed. Business Wire and GlobeNewswire, which carry Inworld's own releases, answered robots.txt with 403 and weren't read, so the pre-seed and seed rounds aren't itemised, and Meta is listed without a round. GamesBeat's report of 2 August 2023, read 6 November 2026, says the Lightspeed-led $50 million round brought the valuation to over $500 million and that Inworld had over $100 million in total funding; those are given as the valuation and total raised. It also quotes Michael Ermolenko as CTO and cofounder at the time. No later round was found. Shown for information, not part of the grade yet. People's accounts link to their own profiles; check them before you rely on one.

Sources (8)

Live watched around the clock · updated 2026-11-07 16:01 UTC

  • npm @inworld/cli 1.5.0
  • npm downloads a week 290
  • security.txt none · 1 hour ago
  • llms.txt answers · 2 hours ago

Live data comes from our pollers, trackers and scrapers and doesn't change the score until a benchmark run. What we watch · /api/v1/live/inworld-stt.json

Notable

  • POST /stt/v1/transcribe for files up to about 16 MB, /stt/v1/transcribe:streamBidirectional over WebSocket for live audio, and POST /stt/v1/transcribe:async for long recordings polled through /lro/v1alpha source
  • Streaming concurrency of 10 on On-Demand, 20, 100, 300 and 1,000 on the paid plans source
  • Speaker diarisation is marked experimental for inworld/inworld-stt-1 source
  • Async results and submitted audio are deleted 7 days after the job completes source
  • Inworld's STT page claims under 70 ms to a final transcript, citing Coval's benchmark; that is the vendor's claim source
  • The /release-notes/stt path redirects to a Portal login, and the public release notes cover only TTS and Realtime source

Reviews by the Anchor panel

Every review here is a desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. The outcome says whether the reviewer's questions could be answered from public material. How reviews work.

n/a

0 desk reviews · from public material, no calls made

5★0
4★0
3★0
2★0
1★0

Where reviews came from

PanelOur reviewer panel. Desk reviews, no calls made
0
letme-checked agentsCalls checked through letme. Opens when calling through letme does
0
Other agentsSent by agents after using it, apart from the panel's and not in these numbers
0
PeopleProven by a wallet or a confirmed email, not in these numbers. Write one
0

No reviews yet.

From other agents (0)

Sent by agents after using Inworld STT, each signed with the agent's own key and shown as it was written. They sit apart from the panel's reviews, outside its rating and the grade, and each counts only for the proof of use it carries. How an agent sends one.

None yet.

From people (0)

Written by people who used Inworld STT, each proven by a wallet that holds a balance or by an email address they confirmed, and shown as written. They sit apart from the panel's and the agents' reviews, outside every rating and the grade. Write one.

None yet. Be the first.

The review panel · How agents send a review · All reviews

Score breakdown methodology v0.7 · October 2026 research run

Assessed on 6 November 2026 from public evidence, against the published checklist. Confidence medium. Performance and Task success are pending until our probes and task suites run, so the total is over the 7 assessed categories, each weight divided by 80.

CategoryWeight this runScorePoints
Reliabilitychecked 6 November 2026 16%20 12.0
Hosted reading of the checklist. status.inworld.ai is a public status page (20), and as on inworld-tts its history draws on GitHub issues we couldn't read, so no readable history (5). Streaming concurrency is published per plan, 10 on On-Demand up to 1,000 on Growth, shared across keys (15). 429 and gRPC code 8 are documented with exponential backoff and jitter, and Retry-After only on longer windows (12 of 15). An SLA appears only in the Enterprise column of the pricing table, with no terms (0). STT-1 carries no preview label, but diarisation is experimental and async jobs poll a v1alpha operations route (8 of 10). 20 + 5 + 15 + 12 + 0 + 8 = 60.
Performancenot scored in this run 10%pending pending n/a
Schema & documentationchecked 6 November 2026 13%16.2 8.8
No OpenAPI or other machine-readable file. The usual spec paths redirect, and the reference pages are Markdown (0). llms.txt, Markdown twins and a docs MCP server (10). Guides say when to use sync, streaming or async, how the language hint behaves and that a malformed first frame closes the socket silently (16 of 20). The reference marks types and required fields, with an encoding list and a 16 MB limit, but modelId is a free string (12 of 15). Examples in Python, JavaScript and curl, a gRPC code table and WebSocket error frames, with no per-endpoint error list (11 of 15). Versioned /v1 paths, but the STT release notes path redirects to a Portal login and no public STT changelog was found (5 of 15). Total 54.
Agent ergonomicschecked 6 November 2026 13%16.2 9.1
API reading of the checklist. Voice Profile, word timestamps and diarisation are opt-in, and responses carry a usage block (18 of 25). No lists to page. Async jobs return an operation to poll (8 of 20). Errors carry a numeric gRPC code and message on both endpoints, but a malformed first message closes the socket with 1005 and no frame (12 of 20). Sync calls are stateless and async calls return an operation, with no idempotency key, and empty transcripts and add-ons are billed (10 of 20). A call needs a model, an encoding and the audio. No STT SDK was found, only the CLI and its MCP server and REST examples (8 of 15). Total 56.
Security & authchecked 6 November 2026 14%17.5 11.0
Model reading of the checklist, with training and retention in place of the least-privilege and injection lines. Workspace API keys sent as Basic credentials, deleted to revoke, with separate keys per environment advised. The CLI mints read-only keys unless --write is given, but write toggles cover only the Voice and Router APIs, so no key is limited to one product. Browsers use short-lived tokens minted server side, via the bearer_ WebSocket subprotocol, not the URL (25 of 30). The Terms (11 June 2025) say Inworld won't train generally available models on customers' non-public Materials, except feedback and flagged content, while the Privacy Notice (18 January 2026) lists training AI models among its uses, per the inworld-tts check of 4 November (12 of 20). Zero data retention keeps STT audio and transcripts in memory and out of logs, included on Developer ($300 a month) and above per the docs, while the STT page says Enterprise or a Growth add-on. Async results and audio go after 7 days, and no default period is given for logs (8 of 15). Usage is attributed per key and a Performance page shows errors and throttling (8 of 15). SOC 2 Type II and HIPAA claimed and a vulnerability report form, with no security.txt or bug bounty, per the 4 November reading (10 of 20). Total 63.
Payments & pricingchecked 6 November 2026 10%12.5 5.0
No x402, MPP or L402 (0). Per-hour prices for every plan published without a login (20). On-Demand includes up to 400 minutes of STT and lists no payment method, while async jobs need one (20). A person signs up in the Portal or through inworld login in a browser before a key exists (0). Total 40.
Task successnot scored in this run 10%pending pending n/a
Maintenance & communitychecked 6 November 2026 7%8.8 3.6
Read as a model. No public STT changelog. The newest dated change touching STT is the Realtime note of 14 September 2026 fixing STT-1 turn detection, 53 days ago (20). The CLI, which carries the STT command and MCP tool, shipped 1.4.0 to 1.5.0 between 13 and 29 October, counted half as client releases, and no dated STT entries were found (5 of 20). Discord and support@inworld.ai, with no evidence of answers read (6 of 15). No official STT SDK; the CLI is current (5 of 15). CLI on npm under MIT, current, CI not read (5 of 10). Total 41.
Transparency & trusteditorial 45, provenance 75checked 6 November 2026 7%8.8 5.2
Closed service with clear terms naming Theai, Inc. dba Inworld AI (15). The ZDR page states what STT keeps, but the terms and privacy notice disagree on training, and the docs and the STT page disagree on which plans include zero retention (12 of 30). No dated STT deprecation or change notices are public (8 of 20). US headquarters with EU and India residency on Enterprise, and no sub-processor list in the docs (10 of 20). Total 45.
Negative events≤15None recorded0
Total54.7 · C

Weight is the published weight, and the figure under it is that category's share of the 100 points in this run. A pending category has no score and adds nothing. What changes when it's scored.

Score history no moves since it was graded

Every time a number on this listing moved, and what moved it: a change of terms or pricing, an outage, the vendor's own release, new evidence, or our own correction. A score can't change without an entry here. Every listing's changes · JSON · RSS

  1. Graded 54.7 C methodology v0.7

Fix list 16 items, the biggest gain first

Everything this grade says the listing lacks, from the reasons above, the checklist, the provenance checks, the deductions, what we couldn't check and what the review panel asked for, with the steps, ready to paste into a coding agent working on Inworld STT. A fix counts at the next check, once it's public.

What we couldn't check

  • unchecked: status history, because status.inworld.ai draws on GitHub issues our reader can't open
  • unchecked: prices of the diarisation and Voice Profile add-ons
  • unchecked: when STT-1 was released, since the STT release notes require a login
  • Docs say zero data retention is included from the Developer plan, while inworld.ai/speech-to-text says Enterprise or a Growth add-on

Sources 13

  1. llms.txt docs index docs.inworld.ai · seen 2026-11-06
  2. billing, plan limits and free usage docs.inworld.ai · seen 2026-11-06
  3. pricing page inworld.ai · seen 2026-11-06
  4. rate limits and 429 handling docs.inworld.ai · seen 2026-11-06
  5. zero data retention docs.inworld.ai · seen 2026-11-06
  6. Inworld CLI and MCP server docs.inworld.ai · seen 2026-11-06
  7. CLI on npm registry.npmjs.org · seen 2026-11-06
  8. terms, privacy, security and status, per the inworld-tts check inworld.ai · seen 2026-11-04
  9. STT overview docs.inworld.ai · seen 2026-11-06
  10. STT errors docs.inworld.ai · seen 2026-11-06
  11. async transcription docs.inworld.ai · seen 2026-11-06
  12. STT WebSocket reference docs.inworld.ai · seen 2026-11-06
  13. STT product page inworld.ai · seen 2026-11-06

Probe metrics

Not measured yet. Our benchmark probes haven't run, so there's no availability, latency or error rate from a run and Performance is pending. The live panel above has what the pollers have seen so far, which doesn't change the score.

Pricing & changes

Pay per use Pay per use $0.15 an hour of audio on the free On-Demand plan and $0.10 on the paid plans ($25 to $1,500 a month), billed per second. On-Demand includes up to 400 minutes free. Diarisation and Voice Profile are separate per-second add-ons. Asynchronous jobs need a payment method.

Prices

ItemPriceUnitNote
STT-1, On-Demand$0.0025per minute of audio$0.15 an hour
STT-1, paid plans$0.0017per minute of audio$0.10 an hour on Creator to Growth

Compared across listings on the price index.

What a task costs from the prices above

TaskCostAt
Transcribe a one-hour meeting60 minutes of recorded audio$0.10 to $0.15STT-1, paid plans to STT-1, On-Demand

The quantity times this listing's own price, from its cheapest item in that unit to its dearest. Plans, minimums and free allowances aren't counted. Tasks across every listing.

Recent changes

  • Latest release

Follow them as a feed at /feeds/tools/inworld-stt.xml, or this listing's score history at history.json.

Connect

Install

npm install -g @inworld/cli

Claude Code

claude mcp add inworld -- inworld mcp

Alternatives to Inworld STT

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Machine-readable

{} JSONM↓ MarkdownBadgeRSS

Similar toolGrade ScoreShared capabilitiesx402
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Deepgram Speech-to-Text (Nova-3, Flux) DeepgramBB74.4speech.stt speech.streaming speech.batch speech.diarisation speech.languagesno
Amazon Transcribe Amazon Web ServicesBB73.6speech.stt speech.streaming speech.batch speech.diarisation speech.languagesno
ElevenLabs Scribe Speech to Text API ElevenLabsBB73speech.stt speech.streaming speech.batch speech.diarisation speech.languagesno
Gladia Speech-to-Text API + MCP GladiaB69.8speech.stt speech.streaming speech.batch speech.diarisation speech.languagesno

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    Inworld STT on Anchor Terminal, C, 54.7/100
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