Baidu open-sources ERNIE 5.5 Flash Base foundation model
What happened
On 6 November 2026, The Decoder reported that Baidu released the open-source foundation model ERNIE-5.5-Flash-Base. The model uses a MoE (mixture of experts) architecture with 280 billion total parameters, activating 14 billion parameters per input. According to the report, the model deliberately skips fine-tuning and post-training, leaving the next steps to developers, with a post-trained version planned for later. Baidu has so far open-sourced this foundation model; the post-trained version has not yet been released.
Written by AI from the reports · updated 3 h ago
Timeline
Follow the reports to see the event from each side.
- The DecoderBaidu releases ERNIE 5.5 Flash Base with 280 billion parameters as an open-source foundation model
Baidu releases ERNIE 5.5 Flash Base: a 280-billion-parameter MoE model pre-trained on 33.5 trillion tokens, shipped deliberately without fine-tuning, so developers can take it wherever they want.
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