Grok 4 Fast (reasoning) vs Claude 4.1 Opus
Detailed comparison of capabilities, features, and performance.
Feature
Grok 4 Fast (reasoning)
Claude 4.1 Opus
Model Image
AI Lab
xAI
Anthropic
Context Size
2,000,000 tokens
200,000 tokens
Max Output Size
30,000 tokens
64,000 tokens
Frontier Model
Yes
Yes
Vision Support
No
Yes
Description
Reasoning-enabled Grok 4 with 2m context. Low latency for time-sensitive tasks and huge context window.
The latest Opus 4.1 model from Anthropic
Learn more about Grok 4 Fast (reasoning)
View detailed specifications and capabilities
View model details →Learn more about Claude 4.1 Opus
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