manelalab/chrono-gpt-instruct-v1-20111231

ChronoGPT-Instruct

ChronoGPT-Instruct is a family of chronologically consistent, instruction-following large language models (LLMs) that eliminate lookahead bias by training exclusively on time-stamped data available before a fixed knowledge-cutoff date τ.
Each ChronoGPT-Instruct-τ extends the ChronoGPT-τ base models through supervised instruction fine-tuning while strictly maintaining temporal separation from all post-τ information.

These models provide the research community with a transparent, replicable benchmark for testing lookahead-bias-free prediction in economics, finance, and other time-sensitive domains.

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🔍 Model Overview

Property	Description
Architecture	Transformer-decoder
Parameters	≈ 1.55 B
Layers	52 layers
Embedding dim	1,536
Context length	1,792 tokens
Tokenizer	GPT2Tokenizer (Hugging Face)
Training stage	Pretraining + Instruction Fine-tuning (SFT)
License	MIT
Languages	English

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🧠 Training & Data

Chronological Consistency

Each model’s corpus satisfies chronologically consistency in both pretraining and instruction-finetuning phases. Texts dated after the model year are excluded, ensuring zero overlap with evaluation data. A GPT-4.1 classifier screens every instruction-response pair.

Instruction-Finetuning Corpus

Stage	Source	# Examples	Avg Length
1	LLMs-from-Scratch	1 097	102
2	GPT-3 Self-Instruct	67 136	183
3	AllenAI Tulu-3 Mixture	356 886	2 513

Only English, non-code entries with pre-2000 content (classifier label = 0 & confidence = 10) are retained.

We release the SFT dataset at https://huggingface.co/datasets/manelalab/ChronoInstruct-SFT.

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🚀 Usage Examples

You can try ChronoGPT-instruct directly in your browser via Google Colab:

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👩‍💻 Citation

@article{He_Lv_Manela_Wu_chronogpt_2025,
  title={Chronologically Consistent Generative AI},
  author={He, Songrun and Lv, Linying and Manela, Asaf and Wu, Jimmy},
  journal={Working Paper},
  year={2025}
}