BytePlus: GPT-OSS 120B
byteplus/gpt-oss-120b-250805
Try GPT-OSS 120B for free in your browser, and add it to your app for free with Puter.js AI API.
Try it free Add to your app// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain quantum computing in simple terms", {
model: "byteplus/gpt-oss-120b-250805"
}).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: "byteplus/gpt-oss-120b-250805"
}).then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
Model Card
GPT-OSS 120B is an open-weight reasoning model built by OpenAI and released under the Apache 2.0 license, available here through BytePlus's hosting.
It is built for agentic workflows, including tool use, web search, and code execution, with adjustable reasoning effort and full chain-of-thought output. It supports structured outputs and is compatible with OpenAI's Responses API format.
On reported benchmarks, it scores 90% on MMLU and 96.6% on AIME 2024, and 80-81% on GPQA Diamond, putting it near parity with OpenAI's o4-mini on core reasoning tasks. It also outperforms o3-mini on competition coding, tool calling (TauBench), and general problem solving, and scores above o4-mini on HealthBench.
Because the weights are open, it suits teams wanting OpenAI-level reasoning quality without the licensing restrictions of closed models like GPT-4.
Context Window 128K
tokens
Max Output 64K
tokens
Input Cost $0.1
per million tokens
Output Cost $0.5
per million tokens
Input text
modalities
Tool Use Yes
Release Date Aug 5, 2025
Try GPT-OSS 120B for free
Try GPT-OSS 120B instantly in your browser.
This playground uses the Puter.js AI API — no API keys or setup required.
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ImageDola Seedream 5.0 Pro
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Frequently Asked Questions
You can access GPT-OSS 120B by BytePlus 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.
GPT-OSS 120B is free to try with a Puter account. Every account includes a free AI allowance, and you can chat with it in the playground on this page. You can upgrade your account anytime for a larger allowance.
GPT-OSS 120B is free to integrate using the Puter.js AI API. With the User-Pays Model, you can add AI to your app for $0, since users cover their own AI usage through their Puter account.
| Price per 1M tokens | |
|---|---|
| Input | $0.1 |
| Output | $0.5 |
GPT-OSS 120B was created by BytePlus and released on Aug 5, 2025.
GPT-OSS 120B supports a context window of 128K tokens. For reference, that is roughly equivalent to 256 pages of text.
GPT-OSS 120B can generate up to 64K tokens in a single response.
GPT-OSS 120B accepts the following input types: text. It produces: text.
Yes, GPT-OSS 120B supports tool use (function calling), allowing it to interact with external tools, APIs, and data sources as part of its response flow.
Yes — the GPT-OSS 120B 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.
Add GPT-OSS 120B to your app for free
Developers can integrate GPT-OSS 120B for free using the Puter.js AI API.
With the User-Pays Model, each user covers their own AI usage instead of the developer.