Model Details

This is a decoder-only model with approximately 9B parameters. The architecture largely follows the Llama design, with the following key hyperparameters:

• Hidden Size: 4096
• Attention Heads: 32
• Layers: 32
• Sequence Length: 2048

Training Data

The training data is a diverse and multilingual dataset, combined high-quality English, code, math, and European language corpora. The total token budget for training is 4 trillion tokens. The training mixture is comprised of the following datasets:

• English: A mixture of Nemotron-CC high-actual and medium-high-actual datasets.
• Code: The StarCoder dataset.
• Math: The FineMath 4+ dataset.
• Multilingual: The cleaned version of HPLT 2.0, covering 36 official EU and partner languages.

The final data split is based on a predefined proportion of English, code, and math, with the remaining token budget allocated to other languages. A minimum proportion for each language in a mix is 0.05% (with the exception of nno_Latn, which is combined with nob_Latn for proportion calculation).

Tokenizer

The model utilizes Gemma-3 tokenizer — a SentencePiece tokenizer with a 262K vocabulary size. It supports over 140 languages, which contributed to the model's multilingual performance.

Training Information

The model was trained using the Megatron-LM framework on the LUMI HPC supercomputer. The training utilized 256 AMD MI250x nodes, totaling approximately 700000 GPU hours.

Intermediate Checkpoints

We have released intermediate checkpoints to provide access to the model's training progression. These checkpoints are available in separate branches, with a new checkpoint released every 10000 training steps.

The naming convention is iter_0xxxxx00. For example, the checkpoint for 50000 iterations is named iter_0050000. The available checkpoints range from iter_0010000 up to iter_0953675. The final checkpoint, iter_0953675, is located in the main branch.