Baidu launches ERNIE 5.5 Flash Preview with 280 billion parameters

The Chinese tech giant's newest model pairs a 1 million token context window with a sparse design that wakes up only 14 billion parameters at a time Baidu has released ERNIE 5.5 Flash Preview, a large language model with about 280 billion parameters and a context window of up to 1 million tokens. The launch landed on November 11, 2026, just six days after its foundation model went public. The Preview is the first post-trained model in the ERNIE 5.5 Flash line. Post-training is the finishing school stage, where a raw model learns to follow instructions and behave usefully instead of just predicting text. The headline number is 280 billion total parameters. Only 14 billion parameters activate for each token the model processes.

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