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Hume AIEVI familyCurrentSpeech and audioReleased 29 May 2025

Hume EVI 3 / EVI 4 mini (speech-to-speech)

Hume’s Empathic Voice Interface for real-time voice agents.

Model idEVI version 3 or 4-mini (set in EVI config)

Price$0.06 per minute

Checked29 September 2026

Where it stands

93newer speech and audio models since its release

The 5 newest are listed. All speech and audio models

After it from Hume AI
Hume Octave 2 (TTS)1 Oct 2025
Weights
Closed weights; access is hosted only.

How to call it

2 ways to use Hume EVI 3 / EVI 4 mini (speech-to-speech), with the model id each provider expects.

Providers, model ids, endpoints and docs for Hume EVI 3 / EVI 4 mini (speech-to-speech)
ProviderModel idEndpointDocs
Hume API (EVI WebSocket) EVI version 3 or 4-mini (set in EVI config) wss://api.hume.ai/v0/evi/chat dev.hume.ai
Web app platform.hume.ai

Pricing

Prices for Hume EVI 3 / EVI 4 mini (speech-to-speech)
Per minute$0.06

As published: “per minute overage on Free/Pro ($0.07 Starter/Creator, $0.05 Scale, $0.04 Business); plans include monthly minutes”.

Source: hume.ai, checked 29 September 2026.

Specs

Input
Audio and text
Output
Audio and text
Context window
Not published
Max output
Not published
Open weights
No
Licence
Proprietary
Released
29 May 2025
Status
Current
Type
Speech and audio

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • Empathic voice interface with any prompted voice

    EVI 3 (2025-05-29) is a speech-to-speech foundation model that can speak in any of 100,000+ custom voices created via prompting, with inferred personality; ~1.2 s practical end-of-speech-to-response latency at launch.

    Source: hume.ai

  • EVI 4 mini: Octave 2 voice in 11 languages

    EVI 4 mini (announced with Octave 2 on 2025-10-01) brings Octave 2 to the speech-to-speech API in 11 languages but must be paired with an external LLM (Anthropic, OpenAI, Google, Fireworks...) until the full EVI 4 ships.

    Source: hume.ai

Notes

EVI 3 is English-only and can answer without an external LLM (‘quick responses’); EVI 4 mini is multilingual but requires a supplemental LLM. Both share the same WebSocket; version is chosen in the EVI configuration. Full EVI 4 not launched as of 2026-09-29 (not on Hume blog). EVI 1/2 are older generations.

Sources: https://dev.hume.ai/docs/speech-to-speech-evi/overview , https://www.hume.ai/pricing , https://www.hume.ai/blog/introducing-evi-3