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OLMo 3-tokenized KletterMix ablation data

Megatron indexed training data tokenized with the OLMo 3 tokenizer (vocabulary size 100,278). Each branch contains exactly 12B tokens in 120M-token shards.

Branch Dataset Composition
climbmix-only ClimbMix only Exactly 12B tokens: 100% ClimbMix.
klettermix-05 5% KletterMix Exactly 12B tokens: 95% ClimbMix (80% base plus 15% extra) and 5% KletterMix.
klettermix-10 10% KletterMix Exactly 12B tokens: 90% ClimbMix (80% base plus 10% extra) and 10% KletterMix.
klettermix-15 15% KletterMix Exactly 12B tokens: 85% ClimbMix (80% base plus 5% extra) and 15% KletterMix.
klettermix-20 20% KletterMix Exactly 12B tokens: 80% ClimbMix and 20% KletterMix.
fineweb2-de-15 15% FineWeb2-deu_Latn Exactly 12B tokens: 85% ClimbMix and 15% FineWeb2-deu_Latn.
fineweb2-de-20 20% FineWeb2-deu_Latn Exactly 12B tokens: 80% ClimbMix and 20% FineWeb2-deu_Latn.
germanweb-15 15% GermanWeb Exactly 12B tokens: 85% ClimbMix and 15% GermanWeb.
germanweb-20 20% GermanWeb Exactly 12B tokens: 80% ClimbMix and 20% GermanWeb.

The branch names are part of the reproducibility interface. The private KletterMix_Ablations repository records the local source paths, exact branch commits, and the submodule mapping. The tokenized data can be consumed by Megatron using the .bin/.idx prefix in the selected branch.

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