Grok 4.6 is xAI’s second model on Amazon Bedrock and adds configurable reasoning effort at four levels.

xAI’s Grok 4.6 is now available in Amazon Bedrock, giving the cloud catalog a frontier model built for long-running agents, coding, and knowledge work. The model landed on Bedrock on August 18, 2026, and carries a 500K token context window plus configurable reasoning effort at low, medium, high, and xhigh levels.

Grok 4.6 is xAI’s second model in Amazon Bedrock. Grok 4.3 marked xAI’s entry as a Bedrock model provider and was reachable only through Bedrock Mantle, the OpenAI-compatible inference engine. Grok 4.6 widens that surface area: it runs on both the bedrock-mantle and bedrock-runtime endpoints and supports the Converse API alongside Chat Completions and Responses.

Teams building long-running agents gain a model that checks its own work on longer trajectories, xAI reports, and one that produces a stronger first pass on visual and interactive projects. Access through bedrock-runtime means standard AWS inference paths now reach Grok, which simplifies routing for operators already standardized on Bedrock.

xAI states that Grok 4.6’s safeguards were calibrated to its capabilities and backed by its widest pre-deployment testing suite, plus post-deployment and third-party testing. The four reasoning levels give operators a dial to trade latency for depth, and the next signal to watch is production performance on multi-step agent workloads and code bases.

What matters

• xAI launched Grok 4.6 on Amazon Bedrock on August 18, 2026, with a 500K token context window.
• Builders can now call the model from both the bedrock-runtime and bedrock-mantle endpoints.
• Watch whether xAI ships a third Bedrock model and how the four reasoning levels perform in production agents.

Why it matters

Watch whether xAI ships a third Bedrock model and how the four reasoning levels perform in production agents.

This GenAI News article was prepared in original wording using reporting and materials published by AWS Machine Learning Blog. Source reference: https://aws.amazon.com/blogs/machine-learning/xais-grok-4-6-is-now-available-in-amazon-bedrock/.

Drafted by the GenAI News review pipeline.