The AI Museum
AI Analytics1,072 recordsRecounted 23 September 2026

Open-weight frontier models in 2019

5

Models

4 organisations

100%

Open weights

5 open, 0 closed

5

Frontier

By Epoch's flag

11B

Largest traceable

T5-11B

2019

Span

5 with a traceable size

Releases

by month
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sept
Oct
Nov
Dec

Records

5
Open-weight frontier models in 2019, newest first. Each row links to the source Epoch AI records for it.
ModelOrganisationReleasedParametersWeights
XLM-RoBERTaFacebook AI2019-11550MOpen
T5-11BGoogle2019-1011BOpen
T5-3BGoogle2019-103BOpen
RoBERTa LargeFacebook2019-07355MOpen
XLNetCarnegie Mellon University (CMU)2019-06340MOpen

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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