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Omnilingual ASR CTC 300M v2

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Omnilingual ASR CTC 300M v2 is an open-weights speech-to-text model from Meta, released December 2025. Its published size is 0.33B parameters. Licence: apache-2.0.

Catalogue identity notes

Omnilingual ASR model card 'omniASR_CTC_300M_v2' (checkpoint https://dl.fbaipublicfiles.com/mms/omniASR-CTC-300M-v2.pt, listed in src/omnilingual_asr/cards/models/rc_models_v2.yaml @ 81f51e2; 'December 2025 Update'). Not on Hugging Face; the CSV entry 'facebook/omniASR-CTC-300M-v2' is the leaderboard's label. Distinct from the v1 checkpoint of the same size. Params: README table. Needs libsndfile (README).

42.8±2.9#130 of 162 speech-to-text modelsfrom 1 benchmark result across 1 source* thinly tested, treat the rank as provisional

Score within the Open ASR English short-form WER (March 2026) comparison set only.

$ how it compares

The speech-to-text models ranked either side of Omnilingual ASR CTC 300M v2, out of 176 with a score, then more from Meta.

#modelscorewhereRAMreleased
141Nemotron 3.5 ASR Streaming 0.6B NVIDIA44±3local~0.7GB2026-05
142Whisper medium OpenAI43±2local~2.3GB2022-09
143Omnilingual ASR CTC 300M v2 Meta43±3local~1.3GB2025-12
144STT En Conformer-Transducer Small NVIDIA43±3local~0.6GB2021-09
145ESPnet Conformer 2020 + RNN LM ESPnet43±4local~1GB2020-11
more from Meta
1Muse Voice Transcribe 1.0 Meta71±3api $0.0030/audio min2026-09
58Omnilingual ASR LLM 7B Meta58±2local~19GB2025-11
59Omnilingual ASR LLM 7B v2 Meta58±3local~19GB2025-12

see all speech-to-text models · find the ones that fit your machine

$ what it's good at

multilingual transcription▃··▃▄█▆▅▄▂·▂ #35 of 36 * · 97% of its score · 1 test

Beats Omnilingual ASR CTC 300M here, though they rank higher overall.

testresultvs the others in its rundifficultycountswhy
Open ASR multilingual WER14.3% ✎▃··▂▃▂█▃█▂▁▁ beats 1/29avg 8.9%▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 97%typical

$ where to run it

Other ways to run it

  1. Run it as published · needs ~1.29 GB · from github.com/facebookresearch (official)
    uv run --python 3.12 --with omnilingual-asr python -c "from omnilingual_asr.models.inference.pipeline import ASRInferencePipeline as P; print(P(model_card='omniASR_CTC_300M_v2').transcribe(['audio.wav'], batch_size=1))"

Official weights and documentation: github.com/facebookresearch ↗

$ how the score was worked out · Open ASR Leaderboard 97%

Each result implies a score on its own, after adjusting for how hard its test is and who ran it. The score is their weighted average, with a small pull toward the middle for thinly tested models. Each test's weight is its counts column above; here it's added up by who ran the tests. How it works

sourceresultsshare of the scorelicence
Open ASR Leaderboard1▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 97%Apache-2.0
prior · pull toward the middle▇ 3%
weighted average= 42.8

$ improve this page

Update model informationAdd a place to run itAdd a test resultPropose a benchmarkCorrect a benchmark scoreEdit data on GitHub

Use a short GitHub form or edit the data through a pull request. Every number needs a source; here's which ones we can use.

data updated · sources and licences · json