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LLM FoundationsMedium· Datasets· Benchmarks· Model Training
What is the difference between C4 and FineWeb, and when would you use one over the other?
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See plansC4 is a 156-billion-token dataset based on a single snapshot using heuristic-only filtering, making it ideal for reproducibility and controlled ablations. FineWeb, by contrast, spans 15 trillion tokens across all available dumps and incorporates fuzzy deduplication. FineWeb is the preferred choice for real-world training runs where a strong, general-purpose baseline is required, particularly for models in the 70B parameter range.