microsoft / microsoft/foundry-dev-tools
gpt-5-mini do not work Parameter max_token changed
@MuyangAmigo is already working on this.
Since Jan 27, 2026.
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Description
Type: Bug
I can´t use an gpt5 Model with the AI Toolkit because openAI change the maxt_tokens Parameter to max_completion_tokens.
The UI do not allow to change the Parameter.
[error] Unable to call the gpt-5-mini inference endpoint due to 400. Please check if the input or configuration is correct. 400 Unsupported parameter: 'max_tokens' is not supported with this model. Use 'max_completion_tokens' instead.
I tryed also to use the Schema Option. With the same Result.
Extension version: 0.28.1
VS Code version: Code 1.108.0 (94e8ae2b28cb5cc932b86e1070569c4463565c37, 2026-01-08T13:53:10.781Z)
OS version: Windows_NT x64 10.0.26100
Modes:
System Info
| Item | Value |
|---|---|
| CPUs | Intel(R) Core(TM) Ultra 7 155U (14 x 2688) |
| GPU Status | 2d_canvas: enabled direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off |
| Load (avg) | undefined |
| Memory (System) | 31.52GB (4.88GB free) |
| Process Argv | --crash-reporter-id 6488783b-8789-4e30-af60-1c3330aea77b |
| Screen Reader | no |
| VM | 0% |
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