xAI has made its Grok 4.3 model generally available on Amazon Bedrock, marking a significant expansion into enterprise...

xAI has made its Grok 4.3 model generally available on Amazon Bedrock, marking a significant expansion into enterprise and agentic AI workloads. The partnership, announced in a joint blog post by AWS and xAI, integrates Grok 4.3 via Mantle, a next-generation inference engine that uses OpenAI-compatible APIs. Grok 4.3 offers configurable reasoning effort (none to high), a 1 million token context window, and strong tool-use capabilities, positioning it for contract analysis, case law, and financial document tasks. The company claims the model ranks #1 on the Artificial Analysis Omniscience benchmark for lowest hallucination rate and places on the intelligence-versus-cost Pareto frontier.

This is a clear design win for xAI, giving it a distribution channel via the largest cloud provider. AWS notes that Grok 4.3 is built for enterprise work where accuracy matters, citing its tool-calling performance on the Tau2 Telecom benchmark and document understanding on Vals AI benchmarks. The partnership could drive adoption among AWS's vast enterprise customer base, potentially increasing inference revenue for xAI.

What the sources said

• AWS Blog: "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."
• AWS Blog: "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."
• AWS Blog: "Grok 4.3 ranked #1 on the Artificial Analysis Omniscience benchmark with the lowest hallucination rate among the frontier models it compared."

Source: Introducing Grok on Amazon Bedrock