Update README.md

README.md

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 # TESS 2 v0.3 - A Generalist Instruction Tuned Diffusion LM
 
 This model is the instruction-tuned TESS 2. This model is a simplex-based diffusion model adapted from Mistral v0.1 7B, further trained on Dolma 1.7 and Tulu 3 SFT data.
-For more details, please check out our paper [TESS-2: A Large-Scale, Generalist Diffusion Language Model](https://todo).
+For more details, please check out our paper [TESS-2: A Large-Scale, Generalist Diffusion Language Model](https://arxiv.org/abs/2502.13917).
 This is the model based on Mistral v0.3 and Tulu 3.
 
 This model will only work with our custom codebase found [here](https://github.com/hamishivi/tess-2) -- please go there to see details on how to run training and inference.