Challenge: In-Context Learning (ICL) is a key method in prompt engineering, but its long retrieved contexts and limited token throughput will slow reasoning speeds.
Approach: They propose a method that leverages the overlap between context and model output to generate drafts from the context.
Outcome: The proposed method achieves the highest mean speedup on Vicuna-7B, Llama2-7B-Chat, and Llma3-8B-Instruct tasks.

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Towards Fast Multilingual LLM Inference: Speculative Decoding and Specialized Drafters (2024.emnlp-main)

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Challenge: Large language models (LLMs) have revolutionized natural language processing and are limited by high inference time in multilingual settings.
Approach: They propose a training recipe for an assistant model in speculative decoding, which are leveraged to draft and-then its future tokens are verified by the target LLM.
Outcome: The proposed model significantly speeds up inference time and out-of-domain speedup across various languages.
Unlocking Efficiency in Large Language Model Inference: A Comprehensive Survey of Speculative Decoding (2024.findings-acl)

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Challenge: Large Language Models (LLMs) have a high inference latency stemming from autoregressive decoding.
Approach: They propose a novel decoding paradigm that drafts multiple tokens and verifies them in parallel . they aim to provide a catalyst for further research on Speculative Decoding .
Outcome: The proposed method drafts multiple tokens and verifies them in parallel . it can be used to accelerate inference in large language models.
LLMLingua: Compressing Prompts for Accelerated Inference of Large Language Models (2023.emnlp-main)

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Challenge: Large language models (LLMs) are increasingly lengthy and require longer prompts . this paper presents a coarse-to-fine prompt compression method to reduce cost and increase performance.
Approach: They propose a coarse-to-fine prompt compression method that maintains semantic integrity under high compression ratios and a token-level iterative compression algorithm to better model the interdependence between compressed contents.
Outcome: The proposed method yields state-of-the-art performance and allows for up to 20x compression with little performance loss over four datasets from different scenarios.
RACER: Retrieval-Augmented Contextual Rapid Speculative Decoding (2026.findings-acl)

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Challenge: Existing methods for decoding large language models generate one token per step, causing high inference latency.
Approach: They propose a method that integrates retrieved exact patterns with logit-driven future cues.
Outcome: Experiments on Spec-Bench, HumanEval, and MGSM-ZH show that RACER outperforms training-free methods and accelerates inference.
Tagging-Augmented Generation: Assisting Language Models in Finding Intricate Knowledge In Long Contexts (2025.emnlp-industry)

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Challenge: Recent studies into effective context lengths of flagship large language models (LLMs) have revealed major limitations in effective question answering (QA) and reasoning over long and complex contexts for even the largest and most impressive cadre of models.
Approach: They propose a lightweight data augmentation strategy that boosts LLM performance in long-context scenarios without degrading and altering the integrity and composition of retrieved documents.
Outcome: The proposed strategy boosts performance in long-context scenarios without degrading and altering the integrity and composition of retrieved documents.
LongSpec: Long-Context Lossless Speculative Decoding with Efficient Drafting and Verification (2026.acl-long)

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Challenge: Large Language Models (LLMs) can process extremely long contexts, requiring efficient inference over extended inputs.
Approach: They propose a model that uses a constant-sized key-value cache to train long-context models.
Outcome: Experimental results show that LongSpec achieves 3.26x speedup over strong Flash Attention baselines and 2.34x wall clock time on four math reasoning tasks.
Discovering the Gems in Early Layers: Accelerating Long-Context LLMs with 1000x Input Token Reduction (2026.findings-acl)

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Challenge: Large Language Models (LLMs) have demonstrated remarkable capabilities in handling long context inputs, but this comes at the cost of increased computational resources and latency.
Approach: They propose an algorithm that uses early LLM layers as filters to select and compress input tokens, reducing the context length for subsequent processing.
Outcome: The proposed method outperforms existing techniques on the Needle in a Haystack task while demonstrating comparable performance on the LongBench challenge.
DReSD: Dense Retrieval for Speculative Decoding (2025.findings-acl)

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Challenge: Speculative decoding (SD) uses an efficient draft model to propose the next few tokens, which are verified by the LLM in a single forward call, reducing latency while preserving its outputs.
Approach: They propose a draft model that proposes the next few tokens from a non-parametric datastore and uses a framework that uses approximate nearest neighbour search with contextualised token embeddings to retrieve the most semantically relevant sequences for SD.
Outcome: The proposed framework achieves (on average) 87% higher acceptance rates, 65% longer accepted tokens and 19% faster generation speeds compared to sparse retrieval (REST).
FastMem: Fast Memorization of Prompt Improves Context Awareness of Large Language Models (2024.findings-emnlp)

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Challenge: Large language models struggle with context awareness, leading to inaccuracies in tasks requiring faithful adherence to provided information.
Approach: They propose a method to enhance LLMs' context awareness by updating only the last Feed-Forward Network module to maximize the likelihood of the prompt before inference .
Outcome: The proposed method improves the accuracy of Llama 3-8B-Inst on the NQ-SWAP dataset from 59.1% to 71.6% and reduces the output structure failure rate of Qwen 1.5-4B-Chat from 34.9% to 25.5%.
Decoding Speculative Decoding (2025.naacl-long)

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Challenge: Speculative decoding is a widely used technique to speed up inference for Large Language Models (LLMs) Autoregressive decoding has been known to be hardware inefficient, leading to poor resource utilization and low throughput during inference.
Approach: They propose to use a draft model to generate speculative tokens and then use the target LLM to verify those tokens.
Outcome: The proposed model can provide 111% higher throughput than existing draft models and generalizes further to all LLaMA models and supervised fine-tuned models.

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