Overview
ERNIE 5.5 Flash Base is a text-only, sparse mixture-of-experts base language model released on November 5, 2026. It is the checkpoint at the end of pre-training, before mid-training or post-training. (ernie.baidu.com)
Capabilities and intended uses
- Architecture: 280 billion total parameters, with 14 billion activated per token; 43 layers, including 42 MoE layers. The model was pre-trained on 33.5 trillion tokens. (huggingface.co)
- Context: Training used up to 131,072 tokens; the released configuration supports up to 1,048,576 tokens for fine-tuning and inference. (huggingface.co)
- Capabilities: Baidu reports evaluations across knowledge, reasoning, mathematics, multilingual tasks, coding and long-context tasks. For example, it reports 78.4 on MMLU-Pro with five-shot prompting and 82.3 Pass@1 on HumanEval+ with one-shot prompting. These are publisher-reported benchmark results, not guarantees of performance. (ernie.baidu.com)
- Uses and deployment: The base checkpoint is intended as a starting point for domain adaptation, instruction tuning and reinforcement-learning research. FP8 and BF16 weights are available; Baidu documents serving through SGLang or vLLM using a completions endpoint. (huggingface.co)
Limitations and license
This is a text-only pre-trained base model, not the separately released, post-trained ERNIE 5.5 Flash Preview. It has not undergone mid-training or post-training; applications may require further training and evaluation. (huggingface.co)
The weights use the ERNIE 5.5 Flash Base Model License Agreement v1.0, not an unrestricted open-source license. The license excludes the European Union, United Kingdom and South Korea from its defined territory and restricts using the model or its outputs to improve unrelated AI models. Non-commercial use is free of model license charges. Qualifying commercial use with related annual product or service revenue at or below USD 50 million requires attribution and a one-time notice; above that threshold, separate written authorization is required. The threshold is a license condition, not an API price. Consult the full license for its definitions and other conditions. (huggingface.co)
Pricing
API input and output pricing for this Base version was not verified on either Baidu's domestic CNY pricing page or its international USD pricing page, checked November 14, 2026. Those pages list the distinct ERNIE-5.5-Flash-Preview version; its rates should not be attributed to Base. Self-hosting the released weights may incur infrastructure costs. (cloud.baidu.com)