language encoder
Longformer base 4096
Longformer base 4096, a checkpoint of the Longformer family. Transformer with sliding-window plus global attention that scales linearly with length, for documents of thousands of tokens; LED is its encoder-decoder for long summarisation.
Levelvariant
Classlanguage encoder
Parametersnot in the notes
Contextnot in the notes
Releasednot in the notes
Opennessopen weights permissive
Runs onnot in the notes
Statusactive
Identity
- Developer
- Allen AI
- Family
- Longformer
- Released
- – sources
- Weights published
- –
- Record checked
- 12 Oct 2026
Where this comes from
Developer and dates from the research notes. Release date is the vendor's public announcement; weights date is when open weights were published.
Architecture and Size
- Architecture
- dense transformer
- Total parameters
- – sources
- Active parameters
- –
- Checkpoint parameters
- –
- Context length
- not in the notes
- Input
- text
- Output
- text
Where this comes from
Parameter counts as the developer states them. Where the checkpoint holds a different total, both are shown (register A16).
Openness and Access
- Openness
- open weights permissive
- Licence
- Apache License 2.0 sources
- Access routes
- open weights download
Where this comes from
The licence file governs over registry tags and aggregator labels.
Deployment
- Runs on
- not in the notes
- Footprint
- not in the notes
- Runtimes
- not in the notes
Where this comes from
Deployment tiers and runtimes as named in the notes. Footprint is the notes' figure, not a measurement by AURION.
Indonesia
- Indonesian support
- not stated
- Regional languages
- not in the notes
- Jakarta hosting
- unknown
- Languages
- Model card languages: en
Where this comes from
Indonesia fields are carried on every model; unknown is an allowed value.
Benchmark Results
The notes record no benchmark result for this model.
Lineage
The notes record no lineage for this model.
Industry Use Cases
No industry use case links this model.
Links
DeveloperAllen AIcompany, USA
Allen AIcompany, USAModelLongformer base 4096Allen AI, language encoder
Longformer base 4096Allen AI, language encoderUse Casesnone recorded
Who Runs Itnone recorded
Organisations 1
Sources
- arxiv.org/abs/2004.05150 https://arxiv.org/abs/2004.05150
- huggingface.co/allenai/longformer-base-4096 https://huggingface.co/allenai/longformer-base-4096
- paperswithcode.com/method/longformer https://paperswithcode.com/method/longformer
- github.com/tensorflow/models/tree/master/official/projec... https://github.com/tensorflow/models/tree/master/official/projects/longformer
To cite this page: Project AURION, AI Use-Cases Research & Innovation, "Longformer Base 4096", https://aurion.semai.id/models/allen-ai-longformer-base-4096/, records of October 2026.