ollama - 💡(How to fix) Fix qwen3.5:35b-a3b-mlx-bf16 posts 500: mlx runner failed: Error: failed to read config.json: [1 comments, 2 participants]

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ollama/ollama#15180Fetched 2026-04-08 01:58:13
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Error Message

500: mlx runner failed: Error: failed to read config.json:

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What is the issue?

Reproduced on Apple Silicon with Ollama 0.19.0.

Model: qwen3.5:35b-a3b-mlx-bf16

Pull succeeds, but run fails with: 500: mlx runner failed: Error: failed to read config.json: config "config.json" not found in manifest

Observed on macOS / Apple Silicon. The model also did not appear to pull the usual supporting artifacts compared with standard Qwen pulls.

Relevant log output

OS

No response

GPU

No response

CPU

No response

Ollama version

No response

extent analysis

TL;DR

  • The issue is likely due to a missing config.json file in the manifest, which is required by the mlx runner, and can be resolved by ensuring the file is present or modifying the runner configuration.

Guidance

  • Verify that the config.json file is included in the model's manifest and that its path is correctly specified.
  • Check the model's documentation or configuration options to see if there's a way to specify an alternative configuration file or disable the mlx runner's requirement for config.json.
  • Investigate why the usual supporting artifacts are not being pulled during the model pull process, as this might be related to the missing config.json issue.
  • Consider testing the model pull and run process on a different platform or with a different version of Ollama to isolate if the issue is specific to Apple Silicon or Ollama 0.19.0.

Example

  • No specific code snippet can be provided without more information about the model's configuration or the mlx runner's implementation.

Notes

  • The issue seems to be specific to Apple Silicon and Ollama 0.19.0, but it's unclear if this is a bug in Ollama or a configuration issue with the model.
  • Without more information about the model's configuration or the mlx runner's requirements, it's difficult to provide a more specific solution.

Recommendation

  • Apply workaround: Modify the model's configuration or the mlx runner's settings to either include the config.json file in the manifest or disable its requirement, as upgrading to a fixed version of Ollama is not explicitly implied in the issue.

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