Introducing Grok on Amazon Bedrock | Amazon Web Services

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This post is co-written with Eric Jiang from xAI (SpaceXAI).

xAI’s Grok 4.3 is now generally available on Amazon Bedrock, giving teams that build agents and AI workflows a model that reasons reliably over long inputs. With this launch, xAI joins Amazon Bedrock as a model provider. Grok 4.3 is a model with configurable reasoning effort. It offers strong tool use and instruction following for building agents, and token efficiency for high-volume inference. It accepts text and image input, and has a 1 million token context window for long documents and multi-turn sessions. The model runs on Mantle, the next-generation inference engine in Amazon Bedrock.

This post covers what makes Grok 4.3 a great fit for agentic and enterprise workloads, how you access it through Amazon Bedrock, and how to use the capabilities most teams reach for first: a basic chat request, configurable reasoning effort, tool calling, structured output, image...

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