Grok 4 Fast (reasoning) vs Claude 4 Opus
Detailed comparison of capabilities, features, and performance.
Feature
Grok 4 Fast (reasoning)
Claude 4 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 model from Anthropic
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View model details →Learn more about Claude 4 Opus
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