Increasing LLM Coding Capabilities through Diverse Synthetic Coding Tasks

• URL: http://arxiv.org/abs/2510.23208v1
• Date: Mon, 27 Oct 2025 10:54:25 GMT
• Title: Increasing LLM Coding Capabilities through Diverse Synthetic Coding Tasks
• Authors: Amal Abed, Ivan Lukic, Jörg K. H. Franke, Frank Hutter,
• Abstract summary: Large language models (LLMs) have shown impressive promise in code generation.<n>We present a scalable synthetic data generation pipeline that produces nearly 800k instruction-reasoning-code-test quadruplets.
• Score: 41.75017840131367
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large language models (LLMs) have shown impressive promise in code generation, yet their progress remains limited by the shortage of large-scale datasets that are both diverse and well-aligned with human reasoning. Most existing resources pair problems with solutions, but omit the intermediate thought process that guides coding. To close this gap, we present a scalable synthetic data generation pipeline that produces nearly 800k instruction-reasoning-code-test quadruplets. Each sample combines a task, a step-by-step reasoning trace, a working solution, and executable tests, enabling models to learn not just the what but also the how of problem solving. Our pipeline combines four key components: curated contest problems, web-mined content filtered by relevance classifiers, data expansion guided by reasoning patterns, and multi-stage execution-based validation. A genetic mutation algorithm further increases task diversity while maintaining consistency between reasoning traces and code implementations. Our key finding is that fine-tuning LLMs on this dataset yields consistent improvements on coding benchmarks. Beyond raw accuracy, reasoning-aware data can substitute for model scaling, generalize across architectures, and outperform leading open-source alternatives under identical sample budgets. Our work establishes reasoning-centered synthetic data generation as an efficient approach for advancing coding capabilities in LLMs. We publish our dataset and generation pipeline to facilitate further research.

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