Inworld AI

Developer of the Realtime TTS speech families and Inworld STT. Its broader inference platform also routes other developers’ models, which remain attributed to their original creators.

Six TTS releases and STT 1 reviewed, including deprecated and retired versions, direct transport limits, plan pricing and LiveKit/Cloudflare deployments. Private custom models, older character-platform engines and exact unnamed auxiliary checkpoints remain unresolved.

Closed-weight models

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What does one question cost?

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Input tokensOutput tokens

Estimate = (input tokens × input price + output tokens × output price) / 1,000,000. Include conversation history in input and billed reasoning in output. Input-only decision models ignore the output setting; enter all billed input for one decision, including its question and criteria. Media, tools and discounts are separate.

7 models

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Model input and output limits, prices and estimated cost per question at the selected token counts.
Input tokensPublished limit*	Output tokensMaximum per response*	Input pricePer 1M tokens	Cost per question1,000 input + 500 outputEstimated · uncached
Not collected	Not collected	Usage pricingNot collected	Different billing unitPrice details ↗
Not collected	Not collected	Usage pricingNot collected	Different billing unitPrice details ↗
Unary 2,000 UTF-16 code units; HTTP stream 4,000; WebSocket 2,000 per sendText messagetext input	MP3, PCM, WAV, LINEAR16, OGG_OPUS, FLAC, ALAW, MULAWoutput formats	Usage pricing $35.00 / 1M charactersSpeech synthesis · Build / Ship · LiveKit Inference$20.00 / 1M charactersSpeech synthesis · Scale · LiveKit InferenceRates & conditions ↗	Different billing unitPrice details ↗
Unary 2,000 UTF-16 code units; HTTP stream 4,000; WebSocket 2,000 per sendText messagetext input	MP3, PCM, WAV, LINEAR16, OGG_OPUS, FLAC, ALAW, MULAWoutput formats	Usage pricing $15.00 / 1M charactersSpeech synthesis · Build / Ship · LiveKit Inference$8.00 / 1M charactersSpeech synthesis · Scale · LiveKit InferenceRates & conditions ↗	Different billing unitPrice details ↗
Unary 2,000 UTF-16 code units; HTTP stream 4,000; WebSocket 2,000 per sendText messagetext input	MP3, PCM, WAV, LINEAR16, OGG_OPUS, FLAC, ALAW, MULAWoutput formats	Usage pricing $25.00 / 1M charactersSpeech synthesis · On-Demand · Inworld API$20.00 / 1M charactersSpeech synthesis · Creator · Inworld APIRates & conditions ↗	Different billing unitPrice details ↗
Unary 2,000 UTF-16 code units; HTTP stream 4,000; WebSocket 2,000 per sendText messagetext input	MP3, PCM, WAV, LINEAR16, OGG_OPUS, FLAC, ALAW, MULAWoutput formats	Usage pricing $15.00 / 1M charactersSpeech synthesis · On-Demand · Inworld API$10.00 / 1M charactersSpeech synthesis · Creator · Inworld APIRates & conditions ↗	Different billing unitPrice details ↗
Sync approximately 16 MB; async up to 512 MBfile limit	JSON transcript, Optional word timestamps, Optional voice-profile estimatesoutput formats	Usage pricing $0.15 / audio hourTranscription · On-Demand · Inworld API$0.10 / audio hourTranscription · Creator · Inworld APIRates & conditions ↗	Different billing unitPrice details ↗

* Media models show their native limits. A shared context window includes both input and output tokens.

Original currency and billing unit, without currency conversion. Rates are dated snapshots; open the conditions for tiers, promotions and endpoint restrictions.How to read the data

Catalog coverage

Closed-weight model variants and explicitly identified closed-source managed model components across language, code, image, video, audio and other documented modalities. Global provider and historical-release coverage is being expanded; this is not yet exhaustive. 172 company reviews are still open.

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