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EffiBench-X: A Multi-Language Benchmark for Measuring Efficiency of LLM-Generated Code

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arxiv 2505.13004 v1 pith:N6YY7W57 submitted 2025-05-19 cs.CL

EffiBench-X: A Multi-Language Benchmark for Measuring Efficiency of LLM-Generated Code

classification cs.CL
keywords codeefficiencyeffibench-xpythonjavallm-generatedbenchmarkeffibench
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Existing code generation benchmarks primarily evaluate functional correctness, with limited focus on code efficiency and often restricted to a single language like Python. To address this gap, we introduce EffiBench-X, the first multi-language benchmark designed to measure the efficiency of LLM-generated code. EffiBench-X supports Python, C++, Java, JavaScript, Ruby, and Golang. It comprises competitive programming tasks with human-expert solutions as efficiency baselines. Evaluating state-of-the-art LLMs on EffiBench-X reveals that while models generate functionally correct code, they consistently underperform human experts in efficiency. Even the most efficient LLM-generated solutions (Qwen3-32B) achieve only around \textbf{62\%} of human efficiency on average, with significant language-specific variations. LLMs show better efficiency in Python, Ruby, and JavaScript than in Java, C++, and Golang. For instance, DeepSeek-R1's Python code is significantly more efficient than its Java code. These results highlight the critical need for research into LLM optimization techniques to improve code efficiency across diverse languages. The dataset and evaluation infrastructure are submitted and available at https://github.com/EffiBench/EffiBench-X.git and https://huggingface.co/datasets/EffiBench/effibench-x.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. PerfCodeBench: Benchmarking LLMs for System-Level High-Performance Code Optimization

    cs.SE 2026-05 unverdicted novelty 7.0

    PerfCodeBench reveals that state-of-the-art LLMs produce functionally correct but significantly slower code than expert-optimized versions on system-level tasks, especially those involving parallelism and GPUs.

  2. CodeSpecBench: Benchmarking LLMs for Executable Behavioral Specification Generation

    cs.SE 2026-04 accept novelty 7.0

    CodeSpecBench shows LLMs achieve at most 20.2% pass rate on repository-level executable behavioral specification generation, revealing that strong code generation does not imply deep semantic understanding.

  3. RLPF: Reinforcement Learning from Performance Feedback for Code Generation

    cs.LG 2026-07 conditional novelty 6.0

    RLPF's staged performance reward lifts Qwen3-32B on PerfCodeBench from 11.1% to 54.6% correct-and-runnable and from 8.1% to 38.6% relative efficiency.

  4. Multi-LLM Orchestration for High-Quality Code Generation: Exploiting Complementary Model Strengths

    cs.SE 2025-10 conditional novelty 6.0

    PerfOrch is a four-agent multi-LLM system that uses offline profiling to build language-and-category rankings for routing tasks, achieving 97.19% and 95.83% pass@1 on HumanEval-X and EffiBench-X with generalization ac...

  5. Rethinking Technology Stack Selection with AI Coding Proficiency

    cs.SE 2025-09 conditional novelty 6.0

    AI coding proficiency, a new measure of how effectively LLMs use a given library, reveals large quality gaps between competing Python libraries, with winners varying by model.

  6. SysLLMatic: Large Language Models are Software System Optimizers

    cs.SE 2025-06 unverdicted novelty 6.0

    SysLLMatic integrates LLMs with performance diagnostics and a 43-pattern catalog to optimize complex software, reporting 1.54x latency and 1.24x energy gains over compilers on large Java systems where prior LLM method...