Grok 4.3 lands on Amazon Bedrock
xAI's Grok 4.3 is generally available on Amazon Bedrock at $1.25/$2.50 per million tokens with a 1M-token context, now sitting next to Claude and Llama.
xAI made Grok 4.3 generally available on Amazon Bedrock on June 17, 2026, so AWS customers can now call the model through Bedrock’s managed API at $1.25 per million input tokens and $2.50 per million output tokens, with cached input at $0.20 per million. The model carries a 1 million token context window with up to 30,000 tokens of output, and it lets you set reasoning effort to none, low, medium, or high to trade speed against depth.
That control matters for cost. A simple classification or extraction job can run with reasoning off and stay cheap and fast, while a contract review or a long research task can dial it up. The 1 million token window means a full contract, a long policy document, or a large codebase can go in one pass.
What it changes for operators
For anyone already on AWS, this is mostly a procurement and plumbing change. Grok now sits beside Claude, Llama, and the other Bedrock models under the same billing, logging, and access controls, so a trial is a config change rather than a new vendor relationship. That makes it easy to compare it against the tools you already pay for instead of committing up front.
xAI says Grok 4.3 has the lowest hallucination rate among frontier models, a claim it ties to third-party benchmarks. Treat that as a reason to test it on your own work, not a guarantee, and keep in mind that the same vendor is facing a safety lawsuit over Grok. A managed option is convenient, but it is one more model to weigh on accuracy and price, much like the recent open-weights gains from GLM-5.2.
Update, July 18: AWS published a technical walkthrough confirming the model runs on Mantle, Bedrock’s newer inference engine, and detailing xAI’s specific benchmark claims: first place on the Artificial Analysis Omniscience leaderboard, the Tau2 Telecom tool-calling benchmark, and Vals AI’s Case Law and Corporate Finance document-understanding tests. No pricing or capability changes accompany the post; it’s a deeper how-to on the same June GA launch.