I think the "Molmo-7B-O" and "MolmoE-1B" models are using Olmo, judging by the fact its LLM backbone is the only one listed as having open data.
EDIT: From the post "For the LLM, we have trained models on a variety of choices at different scales and degrees of openness including: the fully open-weight and data OLMo-7B-1024 (using the October, 2024 pre-released weights, which will be public at a later date), the efficient fully open-weight and data OLMoE-1B-7B-0924, open-weight Qwen2 7B, open-weight Qwen2 72B, open-weight Mistral 7B, open-weight Gemma2 9B, and Phi 3 Medium). Today we are releasing 4 samples from this family."
EDIT: From the post "For the LLM, we have trained models on a variety of choices at different scales and degrees of openness including: the fully open-weight and data OLMo-7B-1024 (using the October, 2024 pre-released weights, which will be public at a later date), the efficient fully open-weight and data OLMoE-1B-7B-0924, open-weight Qwen2 7B, open-weight Qwen2 72B, open-weight Mistral 7B, open-weight Gemma2 9B, and Phi 3 Medium). Today we are releasing 4 samples from this family."