LLM Comparison

Grok 4.1 Fast vs Claude Opus 4.6

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

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2/6 models
Same tier:
 xAIGrok 4.1 FastAnthropicClaude Opus 4.6
OrganizationxAIxAIAnthropicAnthropic
OpenTools Score
73
4.9
FamilyGrokClaude
StatusCurrentCurrent
Release DateNov 2025Feb 2026
Context Window2.0M tokens1.0M tokens
Input Price$0.20/M tokens$5.00/M tokens
Output Price$0.50/M tokens$25.00/M tokens
Pricing NotesCache read: $0.0500/M tokensCache read: $0.5000/M tokens
Capabilities
textvisioncode
textvisioncodetool-use
Max Output30K tokens128K tokens
API Identifierx-ai/grok-4.1-fastanthropic/claude-opus-4.6
Benchmarks
MMLU—89.8
HumanEval—91.5
MATH—84.9
GPQA—72.4
 View Grok 4.1 FastView Claude Opus 4.6

Cost Calculator

Enter your expected monthly token usage to compare costs.

ModelInputOutputTotal / movs Best
Grok 4.1 FastCheapest$0.20$0.25$0.45—
Claude Opus 4.6$5.00$12.50$17.50+3789%

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.

Anthropic

Claude Opus 4.6

Claude Opus 4.6 is a multimodal llm from Anthropic. Supports up to 1,000,000 token context window. Achieves 89.8% on MMLU. Available from $5.00/M input tokens.

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