# HarnessModelConfiguration
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Specification of which model to use.

## Contents
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**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** bedrockModelConfig **   <a name="bedrockagentcorecontrol-Type-HarnessModelConfiguration-bedrockModelConfig"></a>
Configuration for an Amazon Bedrock model.  
Type: [HarnessBedrockModelConfig](API_HarnessBedrockModelConfig.md) object  
Required: No

 ** geminiModelConfig **   <a name="bedrockagentcorecontrol-Type-HarnessModelConfiguration-geminiModelConfig"></a>
Configuration for a Google Gemini model.  
Type: [HarnessGeminiModelConfig](API_HarnessGeminiModelConfig.md) object  
Required: No

 ** openAiModelConfig **   <a name="bedrockagentcorecontrol-Type-HarnessModelConfiguration-openAiModelConfig"></a>
Configuration for an OpenAI model.  
Type: [HarnessOpenAiModelConfig](API_HarnessOpenAiModelConfig.md) object  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/bedrock-agentcore-control-2023-06-05/HarnessModelConfiguration) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/bedrock-agentcore-control-2023-06-05/HarnessModelConfiguration) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/bedrock-agentcore-control-2023-06-05/HarnessModelConfiguration)