xAI's Grok 4.6 lands on Amazon Bedrock with 500K context and new xhigh reasoning tier
AWS ML Blog · rss · 2026-09-22
AWS announced that xAI's Grok 4.6 is now available in Amazon Bedrock (launched August 18, 2026), xAI's second model there, offering a 500K token context window and configurable reasoning effort across four levels: low, medium, high, and xhigh.
- Model focus: Builds on Grok 4.5 for long-running agents and interactive/visual work. xAI reports the model shows more self-testing and verification on long trajectories and stronger first passes on visual projects. Training involved a longer supplemental run, SFT trajectories regenerated with Grok 4.5, and agentic RL tasks spanning coding, kernel optimization, and web development.
- New on Bedrock: Served on both bedrock-mantle and bedrock-runtime endpoints, with Converse API including streaming; cross-region inference profiles us.xai.grok-4.6 ($2.20/M input) and global.xai.grok-4.6 ($2.00/M, cheaper default). Also supports Bedrock Guardrails, invocation logging to CloudWatch (including reasoning tokens), and prompt caching at roughly a quarter of standard input price.
- Benchmarks: Reported Grok 4.6 High scores include AA Intelligence Index 61, CursorBench v3.2 69.9%, Terminal-Bench v3.0 26%.
- Limits: Text and image input, text output only; no audio, video, image generation, or embeddings.
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