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release: label Greek Apertus v0.5
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metadata
language: el
license: apache-2.0
library_name: transformers
pipeline_tag: text-generation
base_model: swiss-ai/Apertus-8B-2509
datasets:
  - glossAPI/apertus-8b-greek-cpt-modern-greek-train
tags:
  - apertus
  - greek
  - glossapi
  - continued-pretraining
model-index:
  - name: apertus-8b-greek-cpt main
    results:
      - task:
          type: text-generation
        dataset:
          name: GreekMMLU (decontaminated, n=16,159)
          type: dascim/GreekMMLU
        metrics:
          - type: accuracy
            value: 54.85
            verified: false
      - task:
          type: text-generation
        dataset:
          name: ASEP MCQA (strict contamination-filtered)
          type: fffoivos/native-greek-suite
        metrics:
          - type: accuracy
            value: 55.08
            verified: false
      - task:
          type: text-generation
        dataset:
          name: DemosQA (strict contamination-filtered)
          type: fffoivos/native-greek-suite
        metrics:
          - type: accuracy
            value: 46.58
            verified: false
      - task:
          type: text-generation
        dataset:
          name: GPCR (strict contamination-filtered)
          type: fffoivos/native-greek-suite
        metrics:
          - type: accuracy
            value: 62.89
            verified: false
      - task:
          type: text-generation
        dataset:
          name: Medical MCQA (strict contamination-filtered)
          type: fffoivos/native-greek-suite
        metrics:
          - type: accuracy
            value: 38.42
            verified: false
      - task:
          type: text-generation
        dataset:
          name: OYXOY metaphor (strict contamination-filtered)
          type: fffoivos/native-greek-suite
        metrics:
          - type: accuracy
            value: 33.89
            verified: false
      - task:
          type: text-generation
        dataset:
          name: OYXOY NLI (strict contamination-filtered)
          type: fffoivos/native-greek-suite
        metrics:
          - type: accuracy
            value: 38.73
            verified: false
      - task:
          type: text-generation
        dataset:
          name: OYXOY WiC (strict contamination-filtered)
          type: fffoivos/native-greek-suite
        metrics:
          - type: accuracy
            value: 33.64
            verified: false
      - task:
          type: text-generation
        dataset:
          name: OYXOY WSD (strict contamination-filtered)
          type: fffoivos/native-greek-suite
        metrics:
          - type: accuracy
            value: 38.06
            verified: false
      - task:
          type: text-generation
        dataset:
          name: Apertus Table-14 retention macro
          type: apertus-pretraining-suite
        metrics:
          - type: accuracy
            value: 62.95
            verified: false

Apertus 8B Greek CPT — full checkpoint trajectory

Continued pretraining on 76.685B active tokens. Base models, not instruction tuned.

Training

79% Modern Greek, 20% foreign replay, 1% Old Greek. Extended vocabulary: 148,992 tokens. 18 training checkpoints and two checkpoint averages. main: terminal checkpoint.

Recommended checkpoint

base-avg30B-50B: GreekMMLU 56.78% (best single checkpoint: 56.81%). Apertus pretraining-suite macro: 64.58% (terminal: 62.95%).

Repositories and checkpoints

Resource Links
Original Apertus Repository, Revision
Instruction models Repository, Stage 1, Greek maths, Conversation
Greek base base-avg30B-50B, 17-step18284-tokens77B, base-avg30B-50B, CHECKPOINTS.md, checkpoint-index.json
Pre-training data Repository, Revision
SFT data Stage 1, Repository
Post-training data Greek maths, Conversation, Repository
Tokenizer Revision, Repository
Benchmark audit Repository

Acknowledgements

This work was implemented thanks to a grant by Swiss AI for compute on CSCS.

Collection: Greek Apertus 8B.