Klang AI releases open model for fast Swedish transcription
Klang AI has launched Pianissimo, an open speech-to-text model for Swedish. The model is reported to transcribe over an hour of audio in one second on a standard laptop.
What happened?
On 23 September 2026, Klang AI announced the release of the open speech-to-text model Pianissimo for the Swedish language. The model is stated to transcribe up to 3,600 times faster than real-time, processing over an hour of audio in one second directly on a standard laptop. Pianissimo is based on Nvidia’s Parakeet model and has been fine-tuned for Swedish and its dialects.
Key facts
| Tillkännagivet datum | 23 september 2026 |
|---|---|
| Hastighet | 3 600 gånger realtid |
| Jämförelse mot KB Whisper | Ca 60 gånger snabbare |
| Basmodell | Nvidia Parakeet |
Why it matters
Transcribing Swedish speech has historically required heavy computational resources or external cloud services. According to Klang AI, Pianissimo achieves an accuracy comparable to the National Library of Sweden’s KB Whisper Large, while being approximately 60 times faster and capable of running locally on consumer hardware or via Berget AI’s Swedish API.
Who is affected?
The release concerns developers, companies, and organisations handling Swedish audio material. The model is specifically aimed at entities that require rapid transcription or, for privacy reasons, prefer to perform processing locally within Sweden.
Impact on the EU
The model is released freely via Hugging Face and can be run entirely locally without transmitting data to external cloud services, facilitating compliance with GDPR and EU data protection regulations.
What else you should know
In Klang AI’s internal tests, accuracy is claimed to be comparable to KB Whisper Large, though independent evaluations are absent from the source material.
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