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Next, open Terminal on your Mac and enter this command: ollama pull gpt-oss:20b ollama run gpt-oss:20b This will prompt your Mac to download gpt-oss-20b, which uses around 15GB of disk storage.
OpenAI’s GPT-OSS-20B can now run locally on Windows. Here’s how to set it up using Microsoft’s AI Foundry toolkit, plus what you’ll need in terms of hardware.