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GPT-OSS-120B Model Unable to Call Document Tools in AI Agent Framework

in AI for Fusion Applications 1 comment

Summary:

GPT-OSS-120B model is unable to invoke Document Tools or other attached tools in Oracle AI Agent framework, while the same setup works correctly with GPT-5 Mini.

Content (please ensure you mask any confidential information):

We are currently working on an AI Agent implementation integrated with Oracle Fusion (AI Agent Studio).

Earlier, we were using the GPT-5 Mini model for our AI Agent orchestration and tool calling. With GPT-5 Mini, the agent was successfully able to:

  • Call attached tools
  • Access document tools / knowledge sources
  • Execute agent actions properly
  • Handle document-based responses correctly

However, due to cost optimization requirements, we started evaluating the "OpenAI gpt-oss-120b" model as an alternative.

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