GPT-OSS 20B API

Access GPT-OSS 20B from OpenAI using Puter.js AI API.

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Model Card

GPT-OSS 20B is OpenAI's smaller open-weight model for lower latency and local inference, matching o3-mini on common benchmarks. It requires only 16GB of memory and runs on consumer hardware.

Context Window N/A

tokens

Max Output 131K

tokens

Input Cost $0.03

per million tokens

Output Cost $0.14

per million tokens

Release Date Jul 22, 2025

API Usage Example

Add GPT-OSS 20B to your app with just a few lines of code.
No API keys, no backend, no configuration required.

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

puter.ai.chat("Explain quantum computing in simple terms", {
    model: "openai/gpt-oss-20b"
}).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: "openai/gpt-oss-20b"
        }).then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

View full documentation →

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Frequently Asked Questions

What is this GPT-OSS 20B API about?

The GPT-OSS 20B API gives you access to OpenAI's chat model through Puter.js. With just a few lines of JavaScript, you can integrate GPT-OSS 20B into any web app or Node.js project — no API keys, no backend, and no configuration required.

Who created GPT-OSS 20B?

GPT-OSS 20B was created by OpenAI and released on Jul 22, 2025.

What is the max output length of GPT-OSS 20B?

GPT-OSS 20B can generate up to 131K tokens in a single response.

How much does it cost?

The GPT-OSS 20B API is available through the User-Pays Model. As a developer, you can add the GPT-OSS 20B API to your app for free — your users pay for their own AI costs directly.

	Price per 1M tokens
Input	$0.03
Output	$0.14

How do I access the GPT-OSS 20B API?

You can access the GPT-OSS 20B API with just a few lines of JavaScript — no API keys, no backend, and no configuration required. Include the Puter.js library in your project and start making calls right away. For more details, check out our documentation.

Does the GPT-OSS 20B API work with React / Vue / Vanilla JS / Node / etc.?

Yes — the GPT-OSS 20B 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 GPT-OSS 20B to your app without worrying about API keys or setup.

Read the Docs View Tutorials