Grok 4.3 lands on Amazon Bedrock for AWS developers

xAI has just rolled out Grok 4.3 on Amazon Bedrock, aiming to make it easier for AWS teams to build with the model via Bedrock’s secure inference engine. The move drew both excitement and skepticism, especially around xAI’s “hallucination rate” and tool-calling claims.

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AmazonGrok
Grok 4.3 lands on Amazon Bedrock for AWS developers

TL;DR

  • Grok on Amazon Bedrock: xAI announced Grok availability on AWS via Amazon Bedrock
  • Model version: Builds reference “Grok 4.3” and model ID xai.grok-4.3
  • Endpoint details: Endpoint bedrock-mantle with URL format [https://bedrock-mantle.{region}.api.aws/openai/v1](https://bedrock-mantle.{region}.api.aws/openai/v1`**)
  • Positioning claims: xAI described low hallucination rate and strong tool calling, using Bedrock’s secure inference engine
  • Docs: xAI follow-up post pointed to getting-started documentation
  • Community reaction: Mixed responses; questions on hallucination wording, chained-flow tool-calling behavior, and access availability

xAI announced on X that Grok is now available on Amazon Bedrock, with the company claiming AWS developers can build with “Grok 4.3” and describing it as “the industry leader in hallucination rate and tool calling,” powered by Bedrock’s “secure inference engine.”

The post was paired with a “Grok on Amazon Bedrock” title card and a small setup table listing an endpoint called bedrock-mantle, the model ID xai.grok-4.3, and an in-region URL formatted as [https://bedrock-mantle.{region}.api.aws/openai/v1.](https://bedrock-mantle.{region}.api.aws/openai/v1`.) A follow-up post from xAI pointed readers to docs for getting started.

Source: xAI on X

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