Kyutai Moshi vs WhisperAPI

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

	Kyutai Moshi Audio	WhisperAPI Audio
Tagline	Open-source, full-duplex speech-to-speech foundation model with sub-200ms latency	Hosted OpenAI Whisper transcription with a pay-as-you-go API and drop-in web dashboard.
Category	Audio	Audio
Pricing	Free· Free and open source. Models under CC-BY 4.0, code under MIT (Python) / Apache 2.0 (Rust). Self-hosted only — you pay your own compute (24GB+ GPU for PyTorch, or Apple Silicon via MLX).	Paid· 20 API Credits: $5 · 100 API Credits: $20 · 200 API Credits: $30 · Custom: $100.00
Model	Moshi (7B-class speech-text foundation model) + Mimi neural audio codec, in-house by Kyutai	OpenAI Whisper
Editorial score	—	6.9 / 10
Use cases	Real-time voice assistant prototypesResearch on full-duplex spoken dialogueOn-device voice interaction on Apple Silicon via MLXLow-latency conversational agents behind WebSocketNeural audio codec experimentation with MimiSelf-hosted voice interface for privacy-sensitive appsSpeech tokenizer for downstream audio LLM trainingInterruptible in-car or wearable voice UX	audio-transcriptionvideo-subtitlesmultilingual-transcriptionpodcast-to-text
Pros	Truly full-duplex — handles interruptions, overlap and back-channels rather than rigid turn-taking Sub-200ms practical latency on a single L4 GPU, well below third-party voice APIs Fully open weights (CC-BY 4.0) plus MIT/Apache code — self-host with no per-minute billing Ships with Mimi, a streaming neural audio codec that beats SpeechTokenizer and SemantiCodec Multiple inference backends: PyTorch for research, Rust/Candle for production, MLX for on-device Mac/iPhone Inner-monologue text prediction gives you a transcript alongside the audio stream for free	Hosted Whisper with no GPU or OpenAI key required Generous 10GB file size and 98+ language coverage Credits never expire and no monthly minimums Outputs JSON, VTT, DOCX, PDF out of the box
Cons	English-only voices at launch — no multilingual support out of the box Knowledge and reasoning quality trail top text LLMs; it's a 7B-class model, not GPT-4o Voice Requires a 24GB+ GPU for the reference PyTorch build; on-device is only viable via MLX on Apple Silicon No hosted API or SaaS tier — you own the ops, scaling and safety filtering Only two fixed synthetic voices (Moshiko/Moshika); no voice cloning or speaker conditioning in the release	More expensive than self-hosting open-source Whisper No advertised diarization or real-time streaming Thin product surface - essentially a Whisper wrapper
Website	kyutai.org	whisper-api.com

Pick Kyutai Moshi if

✅ Truly full-duplex — handles interruptions, overlap and back-channels rather than rigid turn-taking
✅ Sub-200ms practical latency on a single L4 GPU, well below third-party voice APIs
✅ Fully open weights (CC-BY 4.0) plus MIT/Apache code — self-host with no per-minute billing
✅ Ships with Mimi, a streaming neural audio codec that beats SpeechTokenizer and SemantiCodec

Pick WhisperAPI if

✅ Hosted Whisper with no GPU or OpenAI key required
✅ Generous 10GB file size and 98+ language coverage
✅ Credits never expire and no monthly minimums
✅ Outputs JSON, VTT, DOCX, PDF out of the box

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