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OpenAI

GPT-OSS

OpenAI's strategic entry into open weights, optimized for reasoning and agents.

Generic Info

  • Publisher: OpenAI
  • Release Date: Late 2024
  • Parameters: 120B (MoE), 20B
  • Context Window: 128k tokens
  • License: Apache 2.0
  • Key Capabilities: Advanced Reasoning, Tool Use, Agentic Workflows

GPT-OSS bridges the gap between OpenAI's closed frontier models and the open ecosystem. The 120B parameter model uses a Mixture-of-Experts architecture to deliver high-performance reasoning and tool use, making it ideal for building complex agents.

Hello World Guide

Run GPT-OSS using standard libraries like transformers or vLLM.

Python
from transformers import pipeline

# Hypothetical model path for GPT-OSS
model_id = "openai/gpt-oss-120b-instruct"

pipe = pipeline(
    "text-generation",
    model=model_id,
    device_map="auto"
)

messages = [
    {"role": "user", "content": "Plan a 3-day itinerary for Tokyo."}
]

outputs = pipe(
    messages,
    max_new_tokens=500,
)

print(outputs[0]["generated_text"][-1])

Industry Usage

Agentic Workflows

Used as the brain for autonomous agents that need to plan, reason, and use tools reliably.

Hybrid Deployments

Enterprises use GPT-OSS for sensitive data processing on-premise while using GPT-4o for general tasks.

Research

Provides a powerful, aligned baseline for safety and alignment research in the open community.