Baidu

Baidu: ERNIE 4.5 21B A3B

baidu/ernie-4.5-21b-a3b

Access ERNIE 4.5 21B A3B from Baidu using Puter.js AI API.

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

puter.ai.chat("Explain quantum computing in simple terms", {
    model: "baidu/ernie-4.5-21b-a3b"
}).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", {
            model: "baidu/ernie-4.5-21b-a3b"
        }).then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

# pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://api.puter.com/puterai/openai/v1/",
    api_key="YOUR_PUTER_AUTH_TOKEN",
)

response = client.chat.completions.create(
    model="baidu/ernie-4.5-21b-a3b",
    messages=[
        {"role": "user", "content": "Explain quantum computing in simple terms"}
    ],
)

print(response.choices[0].message.content)

curl https://api.puter.com/puterai/openai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_PUTER_AUTH_TOKEN" \
  -d '{
    "model": "baidu/ernie-4.5-21b-a3b",
    "messages": [
      {"role": "user", "content": "Explain quantum computing in simple terms"}
    ]
  }'

Model Card

ERNIE 4.5 21B A3B is a lightweight text-only language model from Baidu using a Mixture-of-Experts architecture with 21B total parameters but only 3B active per token. It excels at general language understanding, generation, reasoning, and coding tasks while remaining computationally efficient. Released under Apache 2.0, it achieves competitive performance against larger models like Qwen3-30B-A3B despite having 30% fewer total parameters.

Context Window 120K

tokens

Max Output 8K

tokens

Input Cost $0.07

per million tokens

Output Cost $0.28

per million tokens

Release Date Jun 30, 2025

 

Model Playground

Try ERNIE 4.5 21B A3B instantly in your browser.
This playground uses the Puter.js AI API — no API keys or setup required.

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Frequently Asked Questions

How do I use ERNIE 4.5 21B A3B?

You can access ERNIE 4.5 21B A3B 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 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 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?
Pricing for ERNIE 4.5 21B A3B is based on the number of input and output tokens used per request.
Price per 1M tokens
Input$0.07
Output$0.28
Who created ERNIE 4.5 21B A3B?

ERNIE 4.5 21B A3B was created by Baidu and released on Jun 30, 2025.

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

ERNIE 4.5 21B A3B supports a context window of 120K tokens. For reference, that is roughly equivalent to 240 pages of text.

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

ERNIE 4.5 21B A3B can generate up to 8K tokens in a single response.

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

Yes — the ERNIE 4.5 21B A3B 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.

Get started with Puter.js

Add ERNIE 4.5 21B A3B to your app without worrying about API keys or setup.

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