# Baidu releases ERNIE 5.5 Flash Base with 280 billion parameters as an open-source foundation model > Source: > Published: 2026-11-05 17:56:41+00:00 # Baidu releases ERNIE 5.5 Flash Base with 280 billion parameters as an open-source foundation model **Baidu's AI development is still alive, but most of the work is on you.** The Chinese company has released [ERNIE-5.5-Flash-Base](https://huggingface.co/baidu/ERNIE-5.5-Flash-Base), an open foundation model that ships deliberately without fine-tuning or post-training. Developers are expected to decide for themselves where to take the model. A post-trained version is supposed to follow. ERNIE 5.5 uses a mixture-of-experts architecture with 280 billion parameters, 14 billion of which are active per input. The model was pre-trained on 33.5 trillion tokens with a training context of up to 128,000 tokens, though it's designed to support a context of up to one million tokens during fine-tuning and inference. In benchmarks for reasoning, code, and long-context tasks, the model competes with similarly sized open foundation models like DeepSeek V4 Flash or MiMo V2.5, according to Baidu. The weights are available on [Hugging Face](https://huggingface.co/baidu/ERNIE-5.5-Flash-Base) in FP8 and BF16. ``` AI News Without the Hype – Curated by Humans Subscribe to THE DECODER for ad-free reading, a weekly AI newsletter, our exclusive "AI Radar" frontier report six times a year, full archive access, and access to our comment section. Subscribe now ``` [Baidu](https://ernie.baidu.com/release/ernie-5-5-flash-base/)