xAI shipped Grok 4.3 on May 6, and the move that matters is the price cut. $1.25 per 1M input tokens, $2.50 per 1M output — roughly 40% below Grok 4.20 — for a model that just hit 53 on the Artificial Analysis Intelligence Index, the highest in its price tier.
The numbers behind the upgrade
GDPval-AA ELO jumped 321 points to 1500, pushing Grok 4.3 past Gemini 3.1 Pro Preview and GPT-5.4 mini. CaseLaw v2 hit 79.3%, ranked #1 in legal reasoning. CorpFin also #1. The pattern: xAI’s reasoning architecture rewards dense logical text — law and corporate finance are exactly that.
What you get through the API
Grok 4.3 is API-first. 1M token context, native reasoning, function calling, structured outputs, prompt caching. Agentic tool calling is the headline feature xAI is pushing for builders. If you’re shipping a legal-tech agent, a finance copilot, or anything long-context, the price-to-quality ratio just got hard to ignore. The release also bundles a fast voice cloning suite and an Imagine agent mode for multi-step tasks.
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