xAI has launched Grok 4.3， achieving 53 on the Artificial Analysis Intelligence Index with improved agentic performance， ~40% lower input price， and ~60% lower output price than Grok 4.20

The release of Grok 4.3 places @xAI just above Muse Spark and Claude Sonnet 4.6 on the Intelligence Index， and a 4 points ahead of the latest version of Grok 4.20. Grok 4.3 improves its Artificial Analysis Intelligence Index score while reducing cost to run the benchmark suite.

Key Takeaways：

➤ Grok 4.3 improves on cost-per-intelligence relative to Grok 4.20 0309 v2： it scores higher on the Intelligence Index while costing less to run the full benchmark suite. Grok 4.3 costs $395 to run the Artificial Analysis Intelligence Index， around 20% lower than Grok 4.20 0309 v2， despite using more output tokens. This makes it one of the lower-cost models at its intelligence level

➤ Large increase in real world agentic task performance： The largest single benchmark improvement is on GDPval-AA， where Grok 4.3 scores an ELO of 1500， up 321 points from Grok 4.20 0309 v2's score of 1179 Grok 4.3， surpassing Gemini 3.1 Pro Preview， Muse Spark， Gpt-5.4 mini （xhigh）， and Kimi K2.5. Grok 4.3 narrows the gap to the leading model on GDPval-AA， but still trails GPT-5.5 （xhigh） by 276 Elo points， with an expected win rate of ~17% against GPT-5.5 （xhigh） under the standard Elo formula

➤ Grok 4.3's performs strongly on instruction following and agentic customer support tasks. It gains 5 points on τ2-Bench Telecom to reach 98%， in line with GLM-5.1. Grok 4.3 maintains an 81% IFBench score from Grok 4.20 0309 v2

➤ Gains 8 points on AA-Omniscience Accuracy， but at the cost of lower AA-Omniscience Non-Hallucination Rate of 8 points， so Grok 4.20 0309 v2 still leads AA-Omniscience Non-Hallucination Rate， followed by MiMo-V2.5-Pro， in line with Grok 4.3

Congratulations to @xAI and @elonmusk on the impressive release！