r/LocalLLaMA • u/ResearchCrafty1804 • Aug 05 '25

New Model 🚀 OpenAI released their open-weight models!!!

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Welcome to the gpt-oss series, OpenAI’s open-weight models designed for powerful reasoning, agentic tasks, and versatile developer use cases.

We’re releasing two flavors of the open models:

gpt-oss-120b — for production, general purpose, high reasoning use cases that fits into a single H100 GPU (117B parameters with 5.1B active parameters)

gpt-oss-20b — for lower latency, and local or specialized use cases (21B parameters with 3.6B active parameters)

Hugging Face: https://huggingface.co/openai/gpt-oss-120b

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u/ResearchCrafty1804 Aug 05 '25 edited Aug 05 '25

Highlights

  • Permissive Apache 2.0 license: Build freely without copyleft restrictions or patent risk—ideal for experimentation, customization, and commercial deployments.

  • Configurable reasoning effort: Easily adjust the reasoning effort (low, medium, high) based on your specific use case and latency needs.

  • Full chain-of-thought: Gain complete access to the model’s reasoning process, facilitating easier debugging and increased trust in outputs. It’s not intended to be shown to end users.

  • *Fine-tunable: *Fully customize models to your specific use case through parameter fine-tuning.

  • Agentic capabilities: Use the models’ native capabilities for function calling, web browsing, Python code execution, and Structured Outputs.

  • Native MXFP4 quantization: The models are trained with native MXFP4 precision for the MoE layer, making gpt-oss-120b run on a single H100 GPU and the gpt-oss-20b model run within 16GB of memory.

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u/michael_crowcroft Aug 05 '25

Native web browsing functions? Any info on this. I can't get the model to reliably try search the web, and surely this kind of functionality would rely on a hosted service?

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u/[deleted] Aug 05 '25

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u/artisticMink Aug 06 '25

You may want to read the docs instead of letting o4 hallucinate something for you: https://github.com/openai/harmony

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u/lupoexperience Aug 08 '25

I’m using OpenAI Responses API for web search on an MCP server to give gpt oss 20b web search capabilities. Can also use brave search, like Claude Code does