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Large language models: an overview of foundational architectures, recent trends, and a new taxonomy

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Mienye, Ibomoiye Domor, Jere, Nobert, Obaido, George, Ogunruku, Oyindamola Omolara, Esenogho, Ebenezer, Modisane, Cameron·2025·Discover Applied Sciences

Abstract

Since the introduction of foundational models such as Bidirectional Encoder Representations from Transformers (BERT) and Generative Pre-trained Transformers (GPT), there has been rapid evolution in both the scale and application of large language models (LLMs). This review provides a concise overview of LLMs, their architecture, training methodologies, and recent innovative applications, focusing on notable models such as the GPT series, BERT, Pathways Language Model (PaLM), and Large Language Model Meta AI (LLaMA), and recently the DeepSeek-R1 model. Additionally, this paper presents a taxonomy for categorizing LLMs based on three critical dimensions: scalability, application domains, and ethical considerations. This taxonomy aims to enable researchers and practitioners to better understand these models in terms of their potential and limitations. Lastly, by reviewing contributions from numerous publications, this study identifies emerging trends, gaps, and opportunities in LLM research, providing a structured guide for future investigations.

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  • Recent advances in GenAI have substantially expanded the capabilities of AI systems, enabling increasingly autonomous forms of human-AI interaction.

    “Recent advances in GenAI have substantially expanded the capabilities of AI systems, enabling increasingly autonomous forms of human-AI interaction (Mienye et al. 2025).”

    From Machine marketing: rethinking the customer in the age of generative AI (2026) · cites this paper as Mienye et al. 2025

    Section 2 (Related works; page unavailable) describes expanded LLM capabilities, including content generation and automated customer service. Section 8.3 (Ethical risk tiers; page unavailable) also discusses models used in autonomous systems. Neither passage establishes the claimed progression toward increasingly autonomous human–AI interaction. (LLM, conf=0.82)

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Cited by

Sorted by citations

Authors
Mienye, I. D., Jere, N., Obaido, G., Ogunruku, O. O., Esenogho, E., & Modisane, C.
Affiliations
  • University of South Africa (ZA)
  • University of Fort Hare (ZA)
  • Western Illinois University (US)
Corresponding author
Obaido, George
Venue
Discover Applied Sciences
Published
2025-09-02
Volume
7
Issue
9
ISSN
3004-9261 (ISSN-L)
OpenAlex
W4413933064
Cited by
46
References
20
Citations by year
2026: 40 · 2025: 6
FWCI
18.45
Type
journal article
Language
en
Open access
Locations
  • Discover Applied Sciences (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
University of California
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Topic Modeling
  • Physical Sciences › Computer Science › Artificial Intelligence › Natural Language Processing Techniques
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Multimodal Machine Learning Applications
Keywords
large language models, LLM architecture, transformer models, BERT, GPT, Arecaceae, llamas, DeepSeek-R1, scalability, ethical considerations, LLM applications

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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