Amazon Bedrock Adds GPT-4.1 and Llama 4 Models with Inline Agents Feature

AWS updated Amazon Bedrock to include GPT-4.1 via a cross-cloud model access preview and Llama 4 Scout and Maverick as fully managed models. A new Inline Agents capability allows developers to define agent instructions and tools dynamically at runtime without pre-configuring agents in the console. The update also expanded Bedrock Guardrails with contextual grounding checks for RAG pipelines and features Claude Mythos Preview as a gated research preview.