FluidInference / parakeet-ultra-coreml

huggingface.co
Total runs: 771
24-hour runs: 305
7-day runs: 771
30-day runs: 771
Model's Last Updated: September 25 2026
automatic-speech-recognition

Introduction of parakeet-ultra-coreml

Model Details of parakeet-ultra-coreml

parakeet-ultra-coreml

Core ML build of moondream/parakeet-ultra , a full-precision post-training of nvidia/parakeet-tdt-0.6b-v3 . Same architecture, 25 languages, tokenizer and output conventions as v3; drop-in for the v3 component contract. Encoder is int8 linear per-channel (595 MB); decoder and joint are re-exported from the Ultra checkpoint; preprocessor and vocabulary are the v3 ones.

Usage (FluidAudio ≥ next release)
let models = try await AsrModels.downloadAndLoad(version: .ultra)
let asr = AsrManager()
try await asr.initialize(models: models)
let result = try await asr.transcribe(audioFileURL)
swift run fluidaudiocli transcribe audio.wav --model-version ultra
Accuracy (FluidAudio, M-series Mac, full corpora, corpus-level WER)
v3 (Core ML) ultra (this repo)
LibriSpeech test-clean (2620 files) 2.27 % 2.13 %
LibriSpeech test-other (2939 files) 4.12 % 3.81 %
FLEURS, 24 languages × 100 samples, mean 14.81 % 11.67 %

Ultra wins all 24 FLEURS languages. The int8 encoder scores the same WER as an fp16 export (2.13 % / 3.79 %). Speed is within a few percent of v3 run back to back on the same machine (test-clean 126.7× vs 128.6× on the ANE).

Files
File Notes
Encoder.mlmodelc 595 MB, int8 linear per-channel, iOS 17+/macOS 14+, fixed 15 s window ( mel [1,128,1501] → encoder [1,1024,188] )
Decoder.mlmodelc RNNT prediction net, fp16, iOS 17+
JointDecisionv3.mlmodelc single-step joint + top-K 64, fp16, iOS 17+
Preprocessor.mlmodelc v3 mel front-end
parakeet_vocab.json , parakeet_v3_vocab.json v3 vocabulary

Conversion recipe: FluidInference/mobius models/stt/parakeet-ultra/coreml . License CC-BY-4.0, as the upstream checkpoint.

Runs of FluidInference parakeet-ultra-coreml on huggingface.co

771
Total runs
305
24-hour runs
620
3-day runs
771
7-day runs
771
30-day runs

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