BytePlus: GPT-OSS 120B
byteplus/gpt-oss-120b-250805
Access GPT-OSS 120B from BytePlus 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: "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>
# 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="byteplus/gpt-oss-120b-250805",
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": "byteplus/gpt-oss-120b-250805",
"messages": [
{"role": "user", "content": "Explain quantum computing in simple terms"}
]
}'
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
Model Playground
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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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.
Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add GPT-OSS 120B to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.
| 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.
Get started with Puter.js
Add GPT-OSS 120B to your app without worrying about API keys or setup.
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