Foundry Tools
Formerly known as Azure AI Services or Azure Cognitive Services is a unified collection of prebuilt AI capabilities within the Microsoft Foundry platform
Experiencing failures with grok-4-fast-reasoning
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GABRIEL DOS SANTOS
10
Reputation points
Experiencing failures with grok-4 and grok-4-fast-reasoning model via API, while grok-4-fast-non-reasoning works successfully using same AI Foundry Resource
- Same endpoint URL
- Same API key
- Same request format
- Non-reasoning variant returns successful responses
- Reasoning variant fails with no response
The model thinks forever until it reaches timeout.
Foundry Tools
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Tom Fadial 5 Reputation points2025-12-15T21:14:16.5533333+00:00 Also not working for me, tried deleting and redeploying. Happening with both API requests and in the Chat playground.
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Miguel Cação 0 Reputation points2025-12-22T12:51:06.0433333+00:00 Stumbled into this problem as well. I deployed both and they worked fine, but after a day or two the reasoning model stopped responding.
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