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 of Grok 4.3 for list of supported regions. To get started, visit the Grok 4.3 model detail page in our documentation.