gpt-oss-120b — Free AI Model & API

Overview

Quick Start

Integrate gpt-oss-120b with 3 lines of code. See the config generator for Claude Code, Cursor, and more.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.cerebras.ai/v1",
    api_key="YOUR_API_KEY"
)

response = client.chat.completions.create(
    model="gpt-oss-120b",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

import OpenAI from "openai";

const openai = new OpenAI({
  baseURL: "https://api.cerebras.ai/v1",
  apiKey: "YOUR_API_KEY",
});

const completion = await openai.chat.completions.create({
  model: "gpt-oss-120b",
  messages: [{ role: "user", content: "Hello!" }],
});

console.log(completion.choices[0].message.content);

curl https://api.cerebras.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-oss-120b",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Other Free Models from Cerebras

Rate Limits & Constraints

Features & Use Cases

How to Get a Free Cerebras API Key

Follow these steps to get your free API key for gpt-oss-120b. No credit card required — just sign up and start using the API.

1. Sign up at cloud.cerebras.ai Email or GitHub. No credit card.
2. Go to API Keys
3. Generate an API key
4. Choose a model Llama 3.3 70B or GPT-OSS 120B available for free.
5. Configure OpenAI client Base URL: https://api.cerebras.ai/v1

Playground — Test gpt-oss-120b

Test gpt-oss-120b directly in your browser. Your API key is sent directly to Cerebras — never stored.

Frequently Asked Questions

More questions? See our full FAQ →

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