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I did a quick `openai/gpt-oss-20b` testing on an Macbook Pro M1 16GB. Pretty impressed with it so far.

* It seems that using version @lmstudio's 20B gguf version (https://huggingface.co/lmstudio-community/gpt-oss-20b-GGUF) will have options for reasoning effort.

* My MBP M1 16GB config: temp 0.8, max content length 7990, GPU offload 8/24, runs slow and still fine for me.

* I tried testing with MCP with the above config, with basic tools like time and fetch + reasoning effort low, and the tool calls instruction follow is quite good.

* In LM Studio's Developer tab there is a log output about the model information which is useful to learn.

Overall, I like the way OpenAI backs to being Open AI, again, after all those years.

--

Shameless plug, If anyone want to try out gpt-oss-120b and gpt-oss-20b as alternative to their own demo page [0], I have added both models with OpenRouter providers in VT Chat [1] as real product. You can try with an OpenRouter API Key.

[0] https://gpt-oss.com

[1] https://vtchat.io.vn



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