GRDD+: An Extended Greek Dialectal Dataset with Cross-Architecture Fine-tuning Evaluation

Stergios Chatzikyriakidis; Dimitriοs Papadakis; Sevasti Ioanna Papaioannou; Erofili Psaltaki

doi:10.63317/3ijtb8uijcjh

GRDD+: An Extended Greek Dialectal Dataset with Cross-Architecture Fine-tuning Evaluation

Stergios Chatzikyriakidis, Dimitriοs Papadakis, Sevasti Ioanna Papaioannou, Erofili Psaltaki

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Abstract

We present an extended Greek Dialectal Dataset (GRDD+) that complements the existing GRDD dataset with more data from Cretan, Cypriot, Pontic and Northern Greek, while we add six new varieties: Greco-Corsican, Griko (Southern Italian Greek), Maniot, Heptanesian, Tsakonian, and Katharevusa Greek. The result is a dataset with total size 6,374,939 words and 10 varieties. This is the first dataset with such variation and size to date. We conduct a number of fine-tuning experiments to see the effect of good quality dialectal data on a number of LLMs. We fine-tune three model architectures (Llama-3-8B, Llama-3.1-8B, Krikri-8B) and compare the results to frontier models (Claude-3.7-Sonnet, Gemini-2.5, ChatGPT-5).

Anthology ID:: 2026.lrec-1.245
Volume:: Proceedings of the Fifteenth Language Resources and Evaluation Conference
Month:: May
Year:: 2026
Address:: Palma de Mallorca, Spain
Editors:: Stelios Piperidis, Núria Bel, Henk van den Heuvel, Nancy Ide, Simon Krek, Antonio Toral
Venue:: LREC
SIG:
Publisher:: ELRA Language Resource Association
Note:
Pages:: 3138–3146
Language:
External URL:: https://lrec.elra.info/lrec2026-main-245
DOI:: 10.63317/3ijtb8uijcjh
Bibkey:
Cite (ACL):: Stergios Chatzikyriakidis, Dimitriοs Papadakis, Sevasti Ioanna Papaioannou, and Erofili Psaltaki. 2026. GRDD+: An Extended Greek Dialectal Dataset with Cross-Architecture Fine-tuning Evaluation. In Proceedings of the Fifteenth Language Resources and Evaluation Conference, pages 3138–3146, Palma de Mallorca, Spain. ELRA Language Resource Association.
Cite (Informal):: GRDD+: An Extended Greek Dialectal Dataset with Cross-Architecture Fine-tuning Evaluation (Chatzikyriakidis et al., LREC 2026)
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@inproceedings{chatzikyriakidis-etal-2026-grdd,
    title = "{GRDD}+: An Extended {G}reek Dialectal Dataset with Cross-Architecture Fine-tuning Evaluation",
    author = "Chatzikyriakidis, Stergios  and
      Papadakis, Dimitri{o}s  and
      Papaioannou, Sevasti Ioanna  and
      Psaltaki, Erofili",
    editor = "Piperidis, Stelios  and
      Bel, N{\'u}ria  and
      van den Heuvel, Henk  and
      Ide, Nancy  and
      Krek, Simon  and
      Toral, Antonio",
    booktitle = "Proceedings of the Fifteenth Language Resources and Evaluation Conference",
    month = may,
    year = "2026",
    address = "Palma de Mallorca, Spain",
    publisher = "ELRA Language Resource Association",
    url = "https://aclanthology.org/2026.lrec-1.245/",
    doi = "10.63317/3ijtb8uijcjh",
    pages = "3138--3146",
    abstract = "We present an extended Greek Dialectal Dataset (GRDD+) that complements the existing GRDD dataset with more data from Cretan, Cypriot, Pontic and Northern Greek, while we add six new varieties: Greco-Corsican, Griko (Southern Italian Greek), Maniot, Heptanesian, Tsakonian, and Katharevusa Greek. The result is a dataset with total size 6,374,939 words and 10 varieties. This is the first dataset with such variation and size to date. We conduct a number of fine-tuning experiments to see the effect of good quality dialectal data on a number of LLMs. We fine-tune three model architectures (Llama-3-8B, Llama-3.1-8B, Krikri-8B) and compare the results to frontier models (Claude-3.7-Sonnet, Gemini-2.5, ChatGPT-5)."
}

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%0 Conference Proceedings
%T GRDD+: An Extended Greek Dialectal Dataset with Cross-Architecture Fine-tuning Evaluation
%A Chatzikyriakidis, Stergios
%A Papadakis, Dimitrios
%A Papaioannou, Sevasti Ioanna
%A Psaltaki, Erofili
%Y Piperidis, Stelios
%Y Bel, Núria
%Y van den Heuvel, Henk
%Y Ide, Nancy
%Y Krek, Simon
%Y Toral, Antonio
%S Proceedings of the Fifteenth Language Resources and Evaluation Conference
%D 2026
%8 May
%I ELRA Language Resource Association
%C Palma de Mallorca, Spain
%F chatzikyriakidis-etal-2026-grdd
%X We present an extended Greek Dialectal Dataset (GRDD+) that complements the existing GRDD dataset with more data from Cretan, Cypriot, Pontic and Northern Greek, while we add six new varieties: Greco-Corsican, Griko (Southern Italian Greek), Maniot, Heptanesian, Tsakonian, and Katharevusa Greek. The result is a dataset with total size 6,374,939 words and 10 varieties. This is the first dataset with such variation and size to date. We conduct a number of fine-tuning experiments to see the effect of good quality dialectal data on a number of LLMs. We fine-tune three model architectures (Llama-3-8B, Llama-3.1-8B, Krikri-8B) and compare the results to frontier models (Claude-3.7-Sonnet, Gemini-2.5, ChatGPT-5).
%R 10.63317/3ijtb8uijcjh
%U https://aclanthology.org/2026.lrec-1.245/
%U https://doi.org/10.63317/3ijtb8uijcjh
%P 3138-3146

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Markdown (Informal)

[GRDD+: An Extended Greek Dialectal Dataset with Cross-Architecture Fine-tuning Evaluation](https://aclanthology.org/2026.lrec-1.245/) (Chatzikyriakidis et al., LREC 2026)

GRDD+: An Extended Greek Dialectal Dataset with Cross-Architecture Fine-tuning Evaluation (Chatzikyriakidis et al., LREC 2026)

ACL

Stergios Chatzikyriakidis, Dimitriοs Papadakis, Sevasti Ioanna Papaioannou, and Erofili Psaltaki. 2026. GRDD+: An Extended Greek Dialectal Dataset with Cross-Architecture Fine-tuning Evaluation. In Proceedings of the Fifteenth Language Resources and Evaluation Conference, pages 3138–3146, Palma de Mallorca, Spain. ELRA Language Resource Association.