The AI Museum
AI Analytics1,072 recordsRecounted 23 September 2026

Open-weight models from United States of America in 2021

Weightsopenclosedunknownfrontier only
Year20262025202420232022202120202019201820172016
3 filters active, showing 28 of 1,072 recordsClear all

28

Models

15 organisations

100%

Open weights

28 open, 0 closed

1

Frontier

By Epoch's flag

1.6T

Largest traceable

Switch

2021

Span

19 with a traceable size

Releases

by month
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Records

28
Open-weight models from United States of America in 2021, newest first. Each row links to the source Epoch AI records for it.
ModelOrganisationReleasedParametersWeights
ContrieverMeta AI2021-12110M *Open
LongT5Google Research2021-123BOpen
XGLM-7.5BMeta AI2021-128BOpen
CodeT5-baseSalesforce2021-11220M *Open
Masked Autoencoders ViT-HFacebook AI Research2021-11632M *Open
AlphaFold-MultimerGoogle DeepMind2021-10—Open
S4Stanford University2021-10249M *Open
6-Act TetherFacebook AI Research2021-085MOpen
DNABERTNortheastern University2021-08110MOpen
XLMR-XXLFacebook AI Research2021-0811BOpen
HuBERTFacebook AI Research2021-071B *Open
SEERFacebook AI Research2021-071BOpen
DeBERTaMicrosoft2021-062BOpen
Denoising Diffusion Probabilistic Models (LSUN Bedroom)University of California (UC) Berkeley2021-06256MOpen
EfficientNetV2-XLGoogle2021-06208MOpen
StyleGAN3-RNVIDIA2021-062MOpen
StyleGAN3-TNVIDIA2021-062MOpen
ADMOpenAI2021-05559MOpen
ByT5-XXLGoogle2021-0513B *Open
Transformer local-attention (NesT-B)Google Cloud2021-0590MOpen
Generative BSTFacebook AI Research2021-039BOpen
UnicornAllen Institute for AI2021-0311BOpen
MSA TransformerFacebook AI Research2021-02100M *Open
SRU++ LargeASAPP2021-02234MOpen
CLIP (ResNet-50)OpenAI2021-0189M *Open
CLIP (ViT L/14@336px)OpenAI2021-01370MOpen
DeiT-BMeta AI2021-0186MOpen
SwitchGoogle2021-011.6TOpen

An asterisk marks a parameter figure the source does not consider traceable to the people who built the model. That judgement is the source’s and it has false negatives: Kimi K3 is marked speculative at 2.8T while Moonshot’s own model card states the figure. Why that distinction carries the whole exhibit.

Counts are of models Epoch AI records as notable, not of every model released. The most recent month is always incomplete, because a model enters the dataset when it is reviewed rather than when it ships.

Epoch AI, 'Data on AI Models'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/data/ai-models-documentation' Used under CC BY 4.0.

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