Best xAI Models for RAG

Match · Updated July 2026

The best xAI model for RAG is Grok 4.5 — 53.8 intelligence with 500K tokens of context for retrieved passages. Grok 4.3 (37.6) and Grok 4.20 (37.0) round out the top three.

53.8Intelligence

$2.00Input /M

500KContext

The best AI models for retrieval-augmented generation, ranked by intelligence among models with at least 128K tokens of context — enough to hold retrieved passages plus conversation. RAG pipelines run at volume, so weigh the price and speed columns as hard as the score.

Frequently asked

What is the best xAI model for RAG?

The best xAI model for RAG is Grok 4.5 — 53.8 intelligence with 500K tokens of context for retrieved passages. Grok 4.3 (37.6) and Grok 4.20 (37.0) round out the top three.

What's a good alternative to Grok 4.5?

Grok 4.3 (37.6) is the closest alternative on this metric, followed by Grok 4.20 (37.0). See the full ranking above for the tradeoffs.

How many xAI models are there?

modelgrep tracks 5 xAI models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by Grok 4.5. 3 of them qualify for this ranking.

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All rankings

Small & Fast LLMs Best Local 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 Longest-Context LLMs Best LLMs for Writing Best LLMs for Math & Science Best LLMs for SQL & Data Analysis Best LLMs for Roleplay Best Uncensored LLMs