Large language model
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A large language model is a deep-learning language model trained on a very large text dataset; a generative LLM commonly produces text through next-token or next-word prediction.
Review status: 2026-11-26
Technical explanation
A generative LLM can produce text by predicting the next token or word in a sentence or phrase.
Conceptual boundaries
An LLM is not a Transformer architecture itself; in its March 2025 publication, NIST described Transformer-based GPT models as then-predominant LLM architecture.
Provider-neutral example
A helpdesk workflow can use an LLM to propose the next sentence of a response for an employee to edit before sending.
Limitations
Next-token or next-word prediction is a common generative mechanism and does not define every language-model architecture.
Related concepts
Atomic claims and evidence
1.1NIST SP 1500-29, Artificial Intelligence in the Fire Service: Considerations for Implementing Artificial Intelligence into Electronic Safety Equipment
- Source
- NIST SP 1500-29, Artificial Intelligence in the Fire Service: Considerations for Implementing Artificial Intelligence into Electronic Safety Equipment
- Source role
- Authoritative source
- Exact locator
- Section 1.1, p. 5: Large Language Models (LLM) bullet; sentences distinguishing Generative LLMs from Discriminatory LLMs
- Supported claim
- NIST SP 1500-29 defines a large language model as a deep-learning language model trained on a very large text dataset and distinguishes generative from discriminatory LLMs; in its generative-AI risk discussion, NIST AI 600-1 states that LLMs predict the next token or word in a sentence or phrase.
- Last verification
- Review due
- Scope limitation
- This distinguishes a broad LLM category from generative LLMs and does not set a parameter-count threshold.
1.2NIST AI 600-1, Artificial Intelligence Risk Management Framework: Generative Artificial Intelligence Profile
- Source
- NIST AI 600-1, Artificial Intelligence Risk Management Framework: Generative Artificial Intelligence Profile
- Source role
- Authoritative source
- Exact locator
- Confabulation pp. 5-6: LLMs predict the next token or word in a sentence or phrase
- Supported claim
- NIST SP 1500-29 defines a large language model as a deep-learning language model trained on a very large text dataset and distinguishes generative from discriminatory LLMs; in its generative-AI risk discussion, NIST AI 600-1 states that LLMs predict the next token or word in a sentence or phrase.
- Last verification
- Review due
- Scope limitation
- This distinguishes a broad LLM category from generative LLMs and does not set a parameter-count threshold.
2.1NIST AI 100-2e2025, Adversarial Machine Learning: A Taxonomy and Terminology of Attacks and Mitigations
- Source
- NIST AI 100-2e2025, Adversarial Machine Learning: A Taxonomy and Terminology of Attacks and Mitigations
- Source role
- Authoritative source
- Exact locator
- Appendix A p. 108: generative pre-trained transformer (GPT)
- Supported claim
- In its March 2025 publication, NIST described GPT as a Transformer-based model family and as the then-predominant architecture for large language models.
- Last verification
- Review due
- Scope limitation
- Predominant does not mean universal, and the claim does not make an LLM identical to its architecture.