lmstudio-ai / lmstudio-ai/lmstudio-bug-tracker

openai/gpt-oss-20b doesn't load because of a validation issue in model.yaml

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Description

**Which version of LM Studio?**
LM Studio 0.3.22

**Which operating system?**
macOS

**What is the bug?**
The `openai/gpt-oss-20b` model (the verified one/"Staff Pick") is not useable because of a validation error in `model.yaml`:

Image

Image

Looks like the `select` type is not supported, manually changing it to `string` fixes the issue and the model appears, but supporting the `select` type is probably the right fix.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the validation error for openai/gpt-oss-20b in LM Studio 0.3.22 on macOS and inspect its model.yaml. Verify that the select type is accepted without manually changing it to string, and that the verified model appears and is usable.

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Assessment

Tech stack
yaml
Domain
desktop
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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