Baidu ERNIE 5.5 Flash Base (open source)

Baidu open-sourced ERNIE 5.5 Flash Base, a 280B-parameter mixture-of-experts base model with 14B active parameters.

Released Nov 5. Pretrained on 33.5 trillion tokens with a 128K pretraining context, extendable to 1 million tokens for fine-tuning and inference. Baidu claims best-in-class scores for its size on knowledge, reasoning, math, code, multilingual and long-context benchmarks, ahead of DeepSeek-V4-Flash-Base and Hy3-preview-Base; those are Baidu's own numbers. It is a base model meant for building specialized models, not a chat assistant.

Status

Released

Date

Nov 5, 2026

Maker

Baidu

Type

AI model

Price

Free (open source)

Categories

AI

Sources

• AIbase

Launch dates can change. Check the sources for the latest. Last reviewed Nov 10, 2026.