Model Comparison
Grok-4 vs Grok-4 Fast Non-Reasoning
Comparing Grok-4 and Grok-4 Fast Non-Reasoning across benchmarks, pricing, and capabilities.
Performance Benchmarks
Comparative analysis across standard metrics
Grok-4 and Grok-4 Fast Non-Reasoning don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Grok-4 ($3.00/1M tokens) is 15.0x more expensive than Grok-4 Fast Non-Reasoning ($0.20/1M tokens).
For output processing, Grok-4 ($15.00/1M tokens) is 30.0x more expensive than Grok-4 Fast Non-Reasoning ($0.50/1M tokens).
In conclusion, Grok-4 is more expensive than Grok-4 Fast Non-Reasoning.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok-4 Fast Non-Reasoning accepts 2,000,000 input tokens compared to Grok-4's 256,000 tokens. Grok-4 Fast Non-Reasoning can generate longer responses up to 30,000 tokens, while Grok-4 is limited to 8,000 tokens.
Input Capabilities
Supported data types and modalities
Both Grok-4 and Grok-4 Fast Non-Reasoning support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok-4
Grok-4 Fast Non-Reasoning
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Grok-4 was released on 2025-07-09, while Grok-4 Fast Non-Reasoning was released on 2025-08-28.
Grok-4 Fast Non-Reasoning is 2 months newer than Grok-4.
Jul 9, 2025
10 months ago
Aug 28, 2025
9 months ago
1mo newerKnowledge Cutoff
When training data ends
Grok-4 has a documented knowledge cutoff of 2024-12-31, while Grok-4 Fast Non-Reasoning's cutoff date is not specified.
We can confirm Grok-4's training data extends to 2024-12-31, but cannot make a direct comparison without Grok-4 Fast Non-Reasoning's cutoff date.
Dec 2024
—
Provider Availability
Grok-4 is available from xAI. Grok-4 Fast Non-Reasoning is available from xAI.
Grok-4
Grok-4 Fast Non-Reasoning
Outputs Comparison
Key Takeaways
No standout differentiators in the data we have for this pair.
Grok-4Grok-4 Fast Non-ReasoningDetailed Comparison
| Feature | | |
|---|
FAQ
Common questions about Grok-4 vs Grok-4 Fast Non-Reasoning.