Update README.md

README.md

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 # BLIP-2, OPT-6.7b, pre-trained only
 
-BLIP-2 model, leveraging [OPT-2.7b](https://huggingface.co/facebook/opt-6.7b) (a large language model with 2.7 billion parameters).
+BLIP-2 model, leveraging [OPT-6.7b](https://huggingface.co/facebook/opt-6.7b) (a large language model with 6.7 billion parameters).
 It was introduced in the paper [BLIP-2: Bootstrapping Language-Image Pre-training with Frozen Image Encoders and Large Language Models](https://arxiv.org/abs/2301.12597) by Li et al. and first released in [this repository](https://github.com/salesforce/LAVIS/tree/main/projects/blip2).
 
 Disclaimer: The team releasing BLIP-2 did not write a model card for this model so this model card has been written by the Hugging Face team.