Unable to use any Foundry models

[asagecty]

I'm not able to use any Foundry models at all now. The models show up in the model list when I click the settings wheel, but the only models I see available to select in the chat are the free GitHub models. I'm seeing the error below in the output tab of VSCode. This started today around 12EST and no one else in my tenant is able to get any Foundry models to load either.

2026-05-14 16:46:06.869 [info] Error: Microsoft.Neutron.AzureFoundry.AzureFoundryService [0] 2026-05-14T16:46:06.869149-04:00 Failed to process model #0 on page 1. error: [The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0., at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack&, JsonReaderException) + 0x2ea
at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader&, T&, JsonSerializerOptions, ReadStack&) + 0x14c at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.Deserialize(Utf8JsonReader&, ReadStack&) + 0x2d
at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1, JsonTypeInfo1, Nullable1) + 0xe5 at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1, JsonTypeInfo1) + 0x115 at System.Text.Json.JsonSerializer.Deserialize[TValue](String, JsonTypeInfo1) + 0x57
at Microsoft.Neutron.AzureFoundry.LocalModelHelper.ToAzureFoundryLocalModel(LocalModel) + 0x24a
at Microsoft.Neutron.AzureFoundry.AzureFoundryApiService.CreateModelsFromResponse(LocalModel[], Int32) + 0x6e]

[a1exwang]

Hi, @asagecty, do you mean Foundry Local models? from the log it seems to be the Foundry Local models, not Foundry models deployed in azure. Could you share a screenshot?

[asagecty]

You're right, the error may not be related. I am talking about Foundry models deployed in Azure.

[nicolassmallwoodgis]

I'm seeing this issue after updating to VS Code 1.120.0 this morning. When I open the Langauge models panel i'm seeing the following traffic in the output window.

[parisk]

I confirm this issue as well. It used to be that I could enable models in the dialog by clicking in the "empty space" on the row at the leftmost place to the model's name. Now this is not possible.

VS Code version

Version: 1.120.0
Commit: 0958016b2af9f09bb4257e0df4a95e2f90590f9f
Date: 2026-05-12T20:17:22Z (1 wk ago)
Electron: 39.8.8
ElectronBuildId: 13870025
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Darwin arm64 25.3.0

Screenshots

Kimi models available in "Language Models" dialog

Kimi models NOT available in "Copilot chat" model picker

Output

AI Toolkit

026-05-20 11:42:20.042 [info] Error: Microsoft.Neutron.AzureFoundry.AzureFoundryService [0]  2026-05-20T11:42:20.042447+03:00 Failed to process model #0 on page 1. error: [The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0.,    at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack&, JsonReaderException) + 0x338
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader&, T&, JsonSerializerOptions, ReadStack&) + 0x164
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.Deserialize(Utf8JsonReader&, ReadStack&) + 0x28
   at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan`1, JsonTypeInfo`1, Nullable`1) + 0xb0
   at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan`1, JsonTypeInfo`1) + 0x120
   at System.Text.Json.JsonSerializer.Deserialize[TValue](String, JsonTypeInfo`1) + 0x54
   at Microsoft.Neutron.AzureFoundry.LocalModelHelper.ToAzureFoundryLocalModel(LocalModel) + 0x244
   at Microsoft.Neutron.AzureFoundry.AzureFoundryApiService.CreateModelsFromResponse(LocalModel[], Int32) + 0x70]
2026-05-20 11:42:20.043 [info] Error: Microsoft.Neutron.AzureFoundry.AzureFoundryService [0]  2026-05-20T11:42:20.042918+03:00 Failed to process model #0 on page 1. error: [The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0.,    at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack&, JsonReaderException) + 0x338
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader&, T&, JsonSerializerOptions, ReadStack&) + 0x164
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.Deserialize(Utf8JsonReader&, ReadStack&) + 0x28
   at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan`1, JsonTypeInfo`1, Nullable`1) + 0xb0
   at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan`1, JsonTypeInfo`1) + 0x120
   at System.Text.Json.JsonSerializer.Deserialize[TValue](String, JsonTypeInfo`1) + 0x54
   at Microsoft.Neutron.AzureFoundry.LocalModelHelper.ToAzureFoundryLocalModel(LocalModel) + 0x244
   at Microsoft.Neutron.AzureFoundry.AzureFoundryApiService.CreateModelsFromResponse(LocalModel[], Int32) + 0x70]
2026-05-20 11:42:20.043 [info] Information: Microsoft.Neutron.AzureFoundry.AzureFoundryService [0]  2026-05-20T11:42:20.043328+03:00 Total models fetched across all pages: 70

[nixonie]

I confirm this issue as well. Pretty much as all of the above, new clean installs of vs code, foundry toolkit for vscode (ai toolkit) and foundry local (+ a model). The model is ok in playground, cannot be added to the "copilot chat"...

[nicolassmallwoodgis]

Updated to VS Code 1.121.0 this morning. The UI is slightly different that previous versions, but I was now able to pin my foundry models (on the right side) and use them again.

[asagecty]

Appears to be working for us now as well. Would be nice if this extension would get a little more attention. Seems like it's broken more than it works...