How to set up and run OpenAI’s ‘gpt-oss-20b’ open weight model locally on your Mac
SMRTR summary
OpenAI's new gpt-oss-20b model can now run locally on Apple silicon Macs with sufficient RAM. The medium-sized 20B model requires at least 16GB RAM and 15GB storage, though performance is slow with minimum specs—taking several minutes to generate responses. Unlike ChatGPT, this offline model lacks web-connected features that reduce hallucinations, but offers privacy since everything happens on your device through the Ollama app.
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