Explore Baidu's ERNIE 4.5 21B A3B Model

Advanced text processing with a 120,000 token context window.

Input: text Output: text Context: 120,000 tokens Release: 2025-08-12

Baidu's ERNIE 4.5 21B A3B, released in August 2025, is a powerful text-based model designed to handle complex multimodal tasks. With a massive context window of 120,000 tokens, it excels in understanding and generating text. The model employs a sophisticated Mixture-of-Experts architecture, activating 3 billion parameters per token for efficient processing. It supports a wide range of applications by utilizing advanced post-training techniques like SFT, DPO, and UPO, ensuring optimal performance. Whether you're working with text-to-text transformations or seeking improved task handling, ERNIE 4.5 provides robust solutions.

Use Cases

Here are a few ways teams apply Baidu: ERNIE 4.5 21B A3B in practice—from fast drafting to multimodal understanding. Adapt these ideas to your workflow.

Enhance multimodal understanding and generation

Optimize text-based applications

Improve task handling with specialized routing

Efficient inference with multi-expert collaboration

Key Features

A quick look at the capabilities that make this model useful in real projects.

21B total parameters with 3B activated per token

120,000 token context length

Text-to-text processing capabilities

Mixture-of-Experts architecture

Advanced post-training techniques

Specs

Overview

Vendor
baidu

Model ID
baidu/ernie-4.5-21b-a3b

Release
2025-08-12

Modalities & context

Input
text

Output
text

Context
120,000 tokens

Parameters & defaults

Supported parameters: frequency_penalty, max_tokens, presence_penalty, repetition_penalty, seed, stop, temperature, tool_choice, tools, top_k, top_p

Defaults: temperature 0.8, top_p 0.8

Benchmark tests: Baidu: ERNIE 4.5 21B A3B

We ran this model against a few representative prompts to show its range. Review the outputs below and be the judge.

Text

Prompt:

Write 150 words on how AI might positively upend work, leisure and creativity

Artificial intelligence (AI) has the potential to revolutionize work, leisure, and creativity in profound ways. In the workplace, AI could automate repetitive tasks, freeing humans to focus on higher-order thinking, innovation, and complex problem-solving. This shift may democratize access to skilled roles, reducing barriers for underrepresented groups. In leisure, AI-driven personalization could curate tailored experiences—from hyper-customized entertainment to adaptive fitness programs—enhancing enjoyment and well-being. For creativity, AI tools like generative algorithms could act as collaborators, sparking inspiration, refining ideas, and even producing novel works across media. By handling data-driven tasks, AI might also reduce burnout, enabling a healthier work-life balance. However, ethical challenges—such as job displacement, algorithmic bias, and intellectual property rights—must be addressed. Ultimately, AI’s positive impact hinges on equitable deployment, ensuring it amplifies human potential rather than replaces it. When harnessed thoughtfully, it could redefine productivity, leisure, and creativity as interconnected, human-centric endeavors.

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up.end

/ˌəpˈend/

verb

To “upend” means to completely disrupt, overturn, or drastically change the established order or structure of something. It implies a significant shift or alteration that can potentially have far-reaching consequences. When something is upended, it is turned upside down or transformed in a way that challenges conventional norms or expectations. The term often carries a sense of innovation, transformation, and sometimes even a hint of upheaval, indicating that the changes are not just minor adjustments but rather a fundamental reimagining of the status quo.

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