xAI Launches Grok 4.3: Fastest Model Yet, Tops Enterprise Benchmarks at $1.25 Per Million Tokens

Grok 4.3 claims the top spot in agentic tool calling and enterprise legal/finance reasoning, with aggressive pricing that undercuts most frontier competitors by a wide margin.

xAI shipped Grok 4.3 to its API on Monday, and the positioning is unmistakable: this is the company's bid for enterprise developer adoption. As @xai announced, the model tops Artificial Analysis leaderboards in agentic tool calling and claims the number-one spot in Vals AI's enterprise benchmarks for case law (79.31%) and corporate finance (68.53%). Those are specific, auditable numbers — and if they hold, they represent a meaningful challenge to Claude and GPT in the domains where legal and financial professionals are most cautiously experimenting with AI.

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