Model Comparison
Grok-4.1 Fast Non-Reasoning vs Grok-4 Fast ReasoningWhich is better in 2026?
Comparing Grok-4.1 Fast Non-Reasoning and Grok-4 Fast Reasoning across benchmarks, pricing, and capabilities.
Verdict: Grok-4.1 Fast Non-Reasoning vs Grok-4 Fast Reasoning — which is better?
Grok-4.1 Fast Non-Reasoning (by xAI) and Grok-4 Fast Reasoning (by xAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
Choose Grok-4.1 Fast Non-Reasoning if…
- you want the most recent training data — it shipped Nov 2025
Choose Grok-4 Fast Reasoning if…
- you want predictable pricing at $0.20/M input and $0.50/M output
Performance Benchmarks
Comparative analysis across standard metrics
Grok-4.1 Fast Non-Reasoning and Grok-4 Fast Reasoningdon'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-4.1 Fast Non-Reasoning ($0.20/1M tokens) costs the same as Grok-4 Fast Reasoning ($0.20/1M tokens).
For output processing, Grok-4.1 Fast Non-Reasoning ($0.50/1M tokens) costs the same as Grok-4 Fast Reasoning ($0.50/1M tokens).
In conclusion, Grok-4.1 Fast Non-Reasoning and Grok-4 Fast Reasoning cost the same.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 2,000,000 tokens. Both models can generate responses up to 30,000 tokens.
Input Capabilities
Supported data types and modalities
Both Grok-4.1 Fast Non-Reasoning and Grok-4 Fast Reasoning support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok-4.1 Fast Non-Reasoning
Grok-4 Fast 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-4.1 Fast Non-Reasoning was released on 2025-11-17, while Grok-4 Fast Reasoning was released on 2025-08-28.
Grok-4.1 Fast Non-Reasoning is 3 months newer than Grok-4 Fast Reasoning.
Nov 17, 2025
8 months ago
2mo newerAug 28, 2025
11 months ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Grok-4.1 Fast Non-Reasoning is available from xAI. Grok-4 Fast Reasoning is available from xAI.
Grok-4.1 Fast Non-Reasoning
Grok-4 Fast Reasoning
Outputs Comparison
Key Takeaways
No standout differentiators in the data we have for this pair.
No standout differentiators in the data we have for this pair.
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Grok-4.1 Fast Non-Reasoning and Grok-4 Fast Reasoning side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Grok-4.1 Fast Non-Reasoning vs Grok-4 Fast Reasoning.