Best xAI Models for Agents

Quick answer · Updated June 2026

Grok 4.3 is the best xAI model for agents, scoring 65.9 on the Artificial Analysis Agentic Index for tool use and multi-step task completion. Grok 4.20 (37.8) is next.

65.9Agentic

53.2Intelligence

127 t/sSpeed

$1.25Input /M

1MContext

AI models ranked by the Artificial Analysis Agentic Index — measuring multi-step tool use, planning and task completion (including Tau²-Bench). The best models for building autonomous agents and agentic workflows.

Frequently asked

What is the best xAI model for agents?

Grok 4.3 is the best xAI model for agents, scoring 65.9 on the Artificial Analysis Agentic Index for tool use and multi-step task completion. Grok 4.20 (37.8) is next.

What's a good alternative to Grok 4.3?

Grok 4.20 (37.8) is the closest alternative on this metric. See the full ranking above for the tradeoffs.

How many xAI models are there?

modelgrep tracks 4 xAI models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by Grok 4.3. 2 of them qualify for this ranking.

More xAI rankings

xAI: Smartest LLMs xAI: Best LLMs for Coding xAI: Best LLMs for Design & Frontend xAI: Fastest LLMs xAI: Lowest-Latency LLMs xAI: Cheapest LLMs xAI: Best Free LLMs xAI: Best Reasoning LLMs xAI: Best Vision LLMs xAI: Best Open-Source LLMs xAI: Longest-Context LLMs

All rankings

Small & Fast LLMs Smartest LLMs Best LLMs for Coding Best LLMs for Design & Frontend Fastest LLMs Lowest-Latency LLMs Cheapest LLMs Best Free LLMs Best Reasoning LLMs Best Vision LLMs Best Open-Source LLMs Longest-Context LLMs