Grok 4.3 from xAI is now available on Amazon Bedrock in AWS GovCloud (US-West)

xAI's Grok 4.3 model is now available on Amazon Bedrock in AWS GovCloud (US-West). With this launch, xAI joins Amazon Bedrock as a model provider in AWS GovCloud (US-West), giving you even more choice as you build generative AI applications across reasoning, agentic, and enterprise workflows. Grok 4.3 is a reasoning-first model that offers configurable reasoning effort (none, low, medium, high). It also offers strong tool use and instruction-following capabilities for building reliable agents, and token efficiency to help keep high-volume inference cost-effective. Grok 4.3 is especially well suited to enterprise workloads such as customer support, web development, case law research, and financial document Q&A, while delivering consistent, high-quality results across conversational Al, search, chat, and multi-turn workflows. Grok 4.3 runs on Mantle, a new inference engine in Amazon Bedrock designed for price performance, with support for tool calling, structured output, and response streaming. See [region availability](https://docs.aws.amazon.com/bedrock/latest/userguide/models-region-compatibility.html) of Grok 4.3 for list of supported regions. To get started, visit the Grok 4.3 [model detail page](https://docs.aws.amazon.com/bedrock/latest/userguide/model-cards.html) in our documentation.