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OpenMayhem
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  3. GPT-OSS 20B

OpenAI

Text model

GPT-OSS 20B

OpenAI's smaller open-weight reasoning model for tools and agents.

ChatCoding
Use this model See capabilities

Input to output

Text→Text
Context
128K tokens
Model size
21B / 3.6B active
Capabilities
Chat · Coding
License
Apache-2.0

Useful features

ReasoningTool callingStructured outputAgentic loops

Capabilities

What you can use it for.

The most useful reasons to choose this model, without making you read through its repository first.

ReasoningTool callingStructured outputAgentic loops
01

Reasoning assistants

02

Function calling

03

Agent workflows

For providers

Want to serve this model?

The provider requirements live here, separate from the information you need to choose and use the model.

Starting pointCPU · 24 GB RAM
Check your hardware in the fit calculator

16 GB memory

MXFP4 · vLLM / llama.cpp

Model source

This is OpenAI's supported minimum. Expect limited context or concurrency near the boundary.

24 GB system RAM

MXFP4 · llama.cpp

Conservative estimate

Memory fits through CPU/RAM, but a paid provider must verify that throughput is useful.

24 GB memory for headroom

MXFP4 · vLLM / llama.cpp

Conservative estimate

OpenAI's 16 GB minimum loads the model; 24 GB leaves more room for context and requests.

Source and license

Check the original model.

OpenMayhem links back to the source repository so you can inspect the model card, files, license, limitations, and creator guidance directly.

Source repositoryopenai/gpt-oss-20bOpen model card

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OpenMayhem

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OpenMayhem is built and operated by Trac Systems UG (haftungsbeschränkt). The software is open source and released under the MIT license; the OpenMayhem and Trac names and logos are trademarks of Trac Systems. The repository is the source of truth for everything described here.

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