# Baidu releases ERNIE 5.5 Flash Base, a lean MoE model

> The bilingual mixture-of-experts base model arrives on Hugging Face, extending Baidu's ERNIE family toward faster, lighter deployments.

Published by The Open Weights on Oct 21, 2026. Canonical: https://theopenweights.com/news/ernie-5-5-flash-p13v

## Key facts

- Company: Baidu
- Model: ERNIE-5.5-Flash-Base
- Version: 5.5-Flash-Base
- Category: Text / LLM
- Modalities: Text / LLM
- License: Other (Open weights, commercial use allowed)
- Context window: 1.0M tokens
- Architecture: Ernie5_5_MoeForCausalLM
- Precision: FP8
- Weights size: 288.3 GB
- Languages: en, zh
- Significance: notable
- Published: 2026-10-21
- Last verified: 2026-11-09
- Hugging Face: https://huggingface.co/baidu/ERNIE-5.5-Flash-Base
- Canonical URL: https://theopenweights.com/news/ernie-5-5-flash-p13v

Baidu has quietly added another entry to its ERNIE lineup with the release of **ERNIE-5.5-Flash-Base**, a text-focused large language model now available on [Hugging Face](https://huggingface.co/baidu/ERNIE-5.5-Flash-Base). The "Flash" designation signals a model tuned for speed and efficiency, and the release is a base model rather than an instruction-tuned chat variant.

Under the hood, ERNIE 5.5 Flash uses a mixture-of-experts (MoE) architecture, the approach that routes each token through a subset of specialized expert networks. That design lets a model carry a large total parameter count while activating only a fraction per inference, which is why MoE has become the default recipe for labs trying to balance capability against serving cost.

## What we know

- It is a **base** model, not a fine-tuned assistant — a foundation for downstream training.
- It targets both **English and Chinese**, consistent with Baidu's bilingual focus.
- It ships under a custom "other" license, so teams should read the terms before commercial use.
- Baidu has not published parameter counts, active parameters, or context length alongside the release.

## Why it matters

Flash-class models are where open-weight releases meet real-world economics. A base MoE model that Baidu can position as fast and affordable gives developers a starting point for building their own fine-tuned systems without paying for a frontier-scale model. As one of the most active contributors to open AI outside the U.S., Baidu's continued ERNIE output keeps competitive pressure on the broader field — though the missing technical details make it hard to gauge exactly where this model lands until benchmarks and documentation follow.

## Get the model

- [Hugging Face](https://huggingface.co/baidu/ERNIE-5.5-Flash-Base)

## Sources

- [baidu/ERNIE-5.5-Flash-Base](https://huggingface.co/baidu/ERNIE-5.5-Flash-Base) — Hugging Face, Oct 21, 2026

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Source: The Open Weights (https://theopenweights.com/). Aggregated and written by Claude, curated by humans. Cite as: "Baidu releases ERNIE 5.5 Flash Base, a lean MoE model", The Open Weights, Oct 21, 2026, https://theopenweights.com/news/ernie-5-5-flash-p13v