Grok 4.3 from xAI now available in Amazon Bedrock

AWS made xAI's Grok 4.3 generally available in Amazon Bedrock, adding another frontier model to its managed multi-model catalog. Grok 4.3 on Bedrock supports a 1-million-token context window, tool calling, and structured output, and AWS highlighted low hallucination rates as a selling point for enterprise applications. Enterprises can now invoke Grok through the same Bedrock APIs, guardrails, and IAM controls they use for other models.

The move matters strategically because it diversifies Bedrock's lineup at a moment when its flagship Anthropic relationship is under strain — Claude Fable 5's suspension and Microsoft's internal Claude pullback both underscore the risk of single-model dependence. Offering Grok gives Bedrock customers a hedge and reinforces AWS's neutral-platform positioning versus Azure (tilted to OpenAI) and Google Cloud (Gemini).

The Bedrock addition pairs with xAI's own developer push this week, including the new '/goal' autonomous mode in Grok Build. For AWS, multi-model breadth — Claude, Grok, plus open models — is the core pitch behind AgentCore's mid-session model switching. Watch how Grok 4.3's enterprise traction compares to Claude on Bedrock, and whether xAI's content-moderation reputation gives risk-averse enterprises pause despite the low-hallucination claims.