ResearchResearch paperLarge Language Models · Training & Scaling · Retrieval, RAG & Search2 sources · Oct 13, 2026

Copy-Paste Language Models

We propose Copy-Paste Language Models (CPLMs), which add a lightweight Copy-Paste head to the conventional language modeling (LM) head.

Key points

  • Transformers are intuitively considered to be efficient at copying from their inputs.
  • We actually show that the ability of LLMs to copy in context can be improved through explicit modeling.
  • We validate our approach by pretraining models from 135M to 1.7B parameters, showing improvements across all scales and backbones with negligible training and inference overheads.
  • We explain the success of CPLMs by showing that they partially mitigate the LM head gradient bottleneck through an alternative gradient path.

Sources (2)

  • [1]Copy-Paste Language Models
    arXiv (AI, ML, NLP, CV, robotics, multi-agent) · Oct 13, 10:03 PM
    We propose Copy-Paste Language Models (CPLMs), which add a lightweight Copy-Paste head to the conventional language modeling (LM) head.
    Transformers are intuitively considered to be efficient at copying from their inputs.
  • [2]Copy-Paste Language Models
    Hugging Face Daily Papers · Oct 13, 12:00 AM · same content

Extractive summary: sentences quoted from the sources.

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