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Hello.
Is model access enabled in the region where your knowledge base is set up?
https://docs.aws.amazon.com/bedrock/latest/userguide/model-access.html
By the way, the models that can be used in the knowledge base are described in the following document.
https://docs.aws.amazon.com/bedrock/latest/userguide/knowledge-base-supported.html
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Do I understand correctly that currently only Anthropic models can be used to generate responses after retrieving information from knowledge bases? If yes, there should be a noticeable disclaimer explaining this, as Anthropic models are not immediately available and require approval.
I think your understanding is correct. Anthropic Claude is currently the only knowledge base response model available.