Hume AI

Octave speech synthesis, EVI voice conversations and expression measurement in audio and faces.

Eight reviewed release and named service records. TTS/EVI sunset and legacy EVI retirement are recorded. Historical expression APIs, numeric pricing and remaining release details still need review.

Closed-weight models

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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.

8 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
5,000 characters per utterancetext input	MP3, WAV, PCMoutput formats	Usage pricing Subscription includes TTS, EVI and voice features, with plan allowances and overages. Current numeric rates remain unverified because the public pricing page redirects to the homepage.Rates & conditions ↗	Different billing unitPrice details ↗
5,000 characters per utterancetext input	MP3, WAV, PCMoutput formats	Usage pricing Subscription includes TTS, EVI and voice features, with plan allowances and overages. Current numeric rates remain unverified because the public pricing page redirects to the homepage.Rates & conditions ↗	Different billing unitPrice details ↗
Not collected	Not collected	Usage pricingNot collected	Different billing unitPrice details ↗
Not collected	Not collected	Usage pricingNot collected	Different billing unitPrice details ↗
Not collected	Not collected	Usage pricing Subscription includes TTS, EVI and voice features, with plan allowances and overages. Current numeric rates remain unverified because the public pricing page redirects to the homepage.Rates & conditions ↗	Different billing unitPrice details ↗
Not collected	Not collected	Usage pricing Subscription includes TTS, EVI and voice features, with plan allowances and overages. Current numeric rates remain unverified because the public pricing page redirects to the homepage.Rates & conditions ↗	Different billing unitPrice details ↗
25 MB upload request, approximately 13 minutesfile limit	Not collected	Usage pricing Billable audio seconds include silence. At least 10 seconds per successful upload or nonempty billed realtime run. Numeric rates require verification.Rates & conditions ↗	Different billing unitPrice details ↗
JPEG only; up to 8,294,400 pixels per image. Uploaded image at most 2 MB; total multipart upload at most 25 MB.image input	Not collected	Usage pricing Each image or accepted video frame counts as one third of a billable second, with a 10-second minimum per billed run. Face count does not set billed duration. Numeric rates require verification.Rates & 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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