Challenge: Existing approaches to unlearning large language models assume full access to the forget dataset, overlooking two key challenges: (1) Forget data is often privacy-sensitive, rare, or legally regulated, making it expensive or impractical to obtain (2) The distribution of available forget data may not align with how that information is represented within the model.
Approach: They propose a “Reveal-and-Release” method to unlearn with self-generated data, prompting the model to reveal what it knows using optimized instructions.
Outcome: The proposed method removes the influence of undesirable data from the model.

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Challenge: Large Language Models (LLMs) have shown to be a great success in a wide range of applications ranging from regular NLP-based use cases to AI agents.
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Decoding-Unlearning: Fact Forgetting via Entropy-Guided Inference (2026.acl-long)

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Challenge: Existing methods for large-scale modeling memorize sensitive information . however, they are limited in real-world scenarios and require updating parameters .
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UNLEARN Efficient Removal of Knowledge in Large Language Models (2025.findings-naacl)

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Challenge: Large Language Models excel in many tasks but are outperformed by specialized tools for certain tasks.
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Answer When Needed, Forget When Not: Language Models Pretend to Forget via In-Context Knowledge Unlearning (2025.findings-acl)

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Challenge: Large language models (LLMs) are increasingly required to selectively unlearn specific information.
Approach: They propose a method which fine-tunes pre-trained LLMs to enable prompt unlearning of target knowledge within the context while preserving unrelated information.
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UIPE: Enhancing LLM Unlearning by Removing Knowledge Related to Forgetting Targets (2025.findings-emnlp)

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Challenge: Existing methods to unlearning large language models focus on forgetting target data while overlooking the impact of logically related knowledge on the effectiveness of unlearning.
Approach: They propose a method that removes knowledge highly correlated with the forgetting targets and a technique that remove logically related knowledge from the model.
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Human-Inspired Obfuscation for Model Unlearning: Local and Global Strategies with Hyperbolic Representations (2025.findings-emnlp)

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Challenge: Existing methods for unlearning large language models struggle to balance effective forgetting with maintaining model utility.
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BLUR: A Bi-Level Optimization Approach for LLM Unlearning (2026.eacl-long)

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Challenge: Existing algorithms to unlearn knowledge and capabilities from large datasets are unclear how to best formulate the unlearning problem.
Approach: They propose to model the hierarchical structure of the unlearning problem, where the forget problem takes priority over the retain problem, and propose an algorithm that aims to unlearn knowledge and capabilities.
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Preserving Privacy Through Dememorization: An Unlearning Technique For Mitigating Memorization Risks In Language Models (2023.emnlp-main)

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Challenge: Large Language models (LLMs) are trained on vast amounts of data, including sensitive information that poses a risk to personal privacy if exposed.
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Unlearners Can Lie: Evaluating and Improving Honesty in LLM Unlearning (2026.acl-long)

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Challenge: Existing methods for unlearning in large language models often hallucinate, generate abnormal token sequences, or behave inconsistently, raising safety and trust concerns.
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