Longest-Context xAI Models

Quick answer · Updated June 2026

Grok 4.20 Multi-Agent has the largest context window of any xAI model, at 2M tokens. Grok 4.20 (2M) and Grok 4.3 (1M) round out the top three.

2MContext

336 t/sSpeed

$1.25Input /M

AI models with the largest context windows, ranked by token capacity. The best large language models for long documents, codebases and extended conversations.

Frequently asked

Which xAI model has the largest context window?

Grok 4.20 Multi-Agent has the largest context window of any xAI model, at 2M tokens. Grok 4.20 (2M) and Grok 4.3 (1M) round out the top three.

What's a good alternative to Grok 4.20 Multi-Agent?

Grok 4.20 (2M) is the closest alternative on this metric, followed by Grok 4.3 (1M). 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. 4 of them qualify for this ranking.

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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 LLMs for Agents Best Open-Source LLMs