Baidu: ERNIE 4.5 21B A3B Thinking

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ERNIE 4.5 21B A3B Thinking is Baidu's reasoning-enhanced language model built on the 21B A3B architecture with explicit chain-of-thought capabilities. It activates only 3B of its 21B parameters per token while specializing in logic, mathematics, coding, and multi-step reasoning tasks. The model supports extended context up to 131K tokens and is optimized for complex problem-solving through structured thinking.

Context Window 131K

tokens

Max Output 66K

tokens

Input Cost $0.07

per million tokens

Output Cost $0.28

per million tokens

Release Date Oct 9, 2025

 

Code Example

Add AI to your app with the Puter.js AI API — no API keys or setup required.

// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';

puter.ai.chat("Explain quantum computing in simple terms").then(response => {
    document.body.innerHTML = response.message.content;
});

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.chat("Explain quantum computing in simple terms").then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

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ERNIE 4.5 VL 424B A47B

ERNIE 4.5 VL 424B A47B is Baidu's largest multimodal vision-language model with 424B total parameters and 47B active per token. It supports up to 131K context tokens and excels at visual reasoning, document/chart understanding, and visual question answering with both thinking and non-thinking modes. In thinking mode, it approaches or surpasses OpenAI o1 on reasoning benchmarks like MathVista, MMMU, and VisualPuzzle.

Frequently Asked Questions

How do I use ERNIE 4.5 21B A3B Thinking?

You can access ERNIE 4.5 21B A3B Thinking by Baidu through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.

Is ERNIE 4.5 21B A3B Thinking free?

Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add ERNIE 4.5 21B A3B Thinking to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.

What is the pricing for ERNIE 4.5 21B A3B Thinking?
ERNIE 4.5 21B A3B Thinking costs $0.07 per 1M input tokens and $0.28 per 1M output tokens.
Price per 1M tokens
Input$0.07
Output$0.28
Who created ERNIE 4.5 21B A3B Thinking?

ERNIE 4.5 21B A3B Thinking was created by Baidu and released on Oct 9, 2025.

What is the context window of ERNIE 4.5 21B A3B Thinking?

ERNIE 4.5 21B A3B Thinking supports a context window of 131K tokens. For reference, that is roughly equivalent to 262 pages of text.

What is the max output length of ERNIE 4.5 21B A3B Thinking?

ERNIE 4.5 21B A3B Thinking can generate up to 66K tokens in a single response.

Does it work with React / Vue / Vanilla JS / Node / etc.?

Yes — the ERNIE 4.5 21B A3B Thinking API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.

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