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MMLU-Pro stories

Nov 5, 2026

Baidu releases ERNIE 5.5 Flash Base, a 280B open-source MoE foundation model

Baidu released ERNIE 5.5 Flash Base, a 280-billion-parameter sparse Mixture-of-Experts language model pre-trained on 33.5 trillion tokens, shipped without fine-tuning as an open-source foundation model for developers.

Nov 5, 2026·2 sources

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Top claims

▪Baidu self-reported that ERNIE 5.5 Flash Base scored 78.4 on MMLU-Pro, surpassing DeepSeek-V4-Flash-Base at 69.2, Hy3-preview-Base at 66.9, and MiMo-V2.5-Base at 65.7
▪Baidu reported that ERNIE 5.5 Flash Base achieved the top score on 24 out of 30 base-model benchmarks in Baidu's unified evaluation pipeline
▪Baidu trained ERNIE 5.5 Flash Base on FlashMask-4 kernels, reporting speedups on NVIDIA SM100 GPUs of up to 175% in forward pass and 74% in backward pass over FlashAttention-4 MaskMod

Topics

Pre-training AI Models Frontier models Open-weight models Chinese AI models Mixture-of-Experts Open-source AI AI benchmarks

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United Kingdom HumanEval South Korea