LLM Comparison

Sonar Pro vs Grok 4.1 Fast

Side-by-side specs, pricing & capabilities · Updated April 2026

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2/6 models

Same tier:

	S Sonar Pro	Grok 4.1 Fast
Organization	Perplexity AI	xAI
OpenTools Score
Family	Sonar	Grok
Status	Current	Current
Release Date	Mar 2025	Nov 2025
Context Window	200K tokens	2.0M tokens
Input Price	$3.00/M tokens	$0.20/M tokens
Output Price	$15.00/M tokens	$0.50/M tokens
Pricing Notes	—	Cache read: $0.0500/M tokens
Capabilities	textvisioncode	textvisioncode
Max Output	8K tokens	30K tokens
API Identifier	`perplexity/sonar-pro`	`x-ai/grok-4.1-fast`
Benchmarks
MMLU	83	—
	View Sonar Pro	View Grok 4.1 Fast

Cost Calculator

Enter your expected monthly token usage to compare costs.

Input tokens / month

Output tokens / month

Model	Input	Output	Total / mo	vs Best
Grok 4.1 FastCheapest	$0.20	$0.25	$0.45	—
Sonar Pro	$3.00	$7.50	$10.50	+2233%

Perplexity AI

Sonar Pro

Sonar Pro is a multimodal llm from Perplexity AI. Supports up to 200,000 token context window. Achieves 83.0% on MMLU. Available from $3.00/M input tokens.

xAI

Grok 4.1 Fast

Grok 4.1 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.