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Stella Biderman

Executive Director of EleutherAI; first author of the Pythia open model suite

Stella Biderman is the Executive Director of EleutherAI. She is first author of the Pythia paper, which introduced 16 language models from 70M to 12B parameters, all trained on public data in the same order, with 154 checkpoints released for each model so researchers can study how models change over training and scale. She is also among the credited authors of the Language Model Evaluation Harness, EleutherAI's open framework for evaluating language models.1234

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Sources · reviewed Sep 29, 2026

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