Claude Sonnet 4.6 vs Grok 4.1 Fast Reasoning

Claude Sonnet 4.6 vs Grok 4.1 Fast Reasoning: Grok 4.1 Fast Reasoning is cheaper by 97% on average. Claude Sonnet 4.6 from Azure AI Foundry (1,000,000-token context, reasoning, tool calls) vs. Grok 4.1 Fast Reasoning from xAI (2,000,000-token context, reasoning, tool calls). Use Agent Command Center to A/B both in shadow mode and pick the winner per workload.

Side-by-side cost

Live workload comparison

Same workload run through both models. The cheaper one is highlighted.

Input tokens / request3,000

02,000,000

Output tokens / request400

0200,000

Requests / day5,000

01,000,000

Claude Sonnet 4.6

Azure AI Foundry

$2,283/mo

Input $3.00/M · Output $15.00/M

Grok 4.1 Fast ReasoningCheaper

xAI

$122/mo

Input $0.200/M · Output $0.500/M

At this workload, Grok 4.1 Fast Reasoning is 95% cheaper than Claude Sonnet 4.6 — a savings of $2,161/month ($25,933/year).

Production recipe — Agent Command Center

strategy: cost-optimized
primary:
  model: grok-4-1-fast-reasoning
  provider: xai
fallback:
  model: claude-sonnet-4-6
  provider: azure-ai-foundry
shadow: { sample_rate: 0.05 }   # mirror 5% of traffic to compare quality live

Get started free →Routing docs ↗

	Claude Sonnet 4.6 Azure AI Foundry	Grok 4.1 Fast Reasoning xAI
Input price	$3.00/M	$0.200/M
Output price	$15.00/M	$0.500/M
Context window	1,000,000	2,000,000
Max output	64,000	2,000,000
Function calling	✓	✓
Vision	✓	✓
Audio input	—	✓
Reasoning	✓	✓
Prompt caching	✓	✓
Structured output	✓	✓
Pricing verified	May 12, 2026	May 12, 2026