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 ## 📣 News
+- [06/04/2026] [**NVIDIA Nemotron 3 Ultra**](https://huggingface.co/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16) is now public! Day-0 support for the 550B-A55B hybrid Mamba-Transformer MoE model is available on the [`nemotron_3_ultra`](https://github.com/NVIDIA-NeMo/Megatron-Bridge/tree/nemotron_3_ultra) branch, including checkpoint conversion, inference, SFT, PEFT (LoRA), and pretraining examples. Read the [NVIDIA Technical Blog](https://developer.nvidia.com/blog/nvidia-nemotron-3-ultra-powers-faster-more-efficient-reasoning-for-long-running-agents/) and see the [examples README](https://github.com/NVIDIA-NeMo/Megatron-Bridge/blob/nemotron_3_ultra/examples/models/nemotron/nemotron_3/ultra/README.md) for the full walkthrough.
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 - [05/28/2026] [**Step-3.7-Flash**](https://github.com/NVIDIA-NeMo/Megatron-Bridge/tree/main/examples/models/stepfun/step37) is now merged on **main**! See the [examples README](https://github.com/NVIDIA-NeMo/Megatron-Bridge/tree/main/examples/models/stepfun/step37/README.md) for sft training details.
 
 - [05/26/2026] [**DeepSeek V4**](https://huggingface.co/deepseek-ai/DeepSeek-V4-Flash) FP8 support is now available in Megatron Bridge, including HF↔Megatron conversion, quantized checkpoint export with regenerated scale tensors, and downstream verification with Megatron-backend GRPO.