Model Comparison
Grok-3 vs Grok-4 Heavy
Grok-4 Heavy shows notably better performance in the majority of benchmarks.
Performance Benchmarks
Comparative analysis across standard metrics
Grok-3 outperforms in 0 benchmarks, while Grok-4 Heavy is better at 2 benchmarks (AIME 2025, GPQA).
Grok-4 Heavy shows notably better performance in the majority of benchmarks.
Arena Performance
Human preference votes
Context Window
Maximum input and output token capacity
Only Grok-3 specifies input context (128,000 tokens). Only Grok-3 specifies output context (8,000 tokens).
Input Capabilities
Supported data types and modalities
Both Grok-3 and Grok-4 Heavy support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok-3
Grok-4 Heavy
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-3 was released on 2025-02-17, while Grok-4 Heavy's release date is not specified.
We can confirm Grok-3's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.
Feb 17, 2025
1.3 years ago
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Knowledge Cutoff
When training data ends
Grok-3 has a knowledge cutoff of 2024-11-17, while Grok-4 Heavy has a cutoff of 2024-12-31.
Grok-4 Heavy has more recent training data (up to 2024-12-31), making it potentially better informed about events through that date compared to Grok-3 (2024-11-17).
Nov 2024
Dec 2024
1 mo newerOutputs Comparison
Key Takeaways
Grok-3Grok-4 HeavyDetailed Comparison
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FAQ
Common questions about Grok-3 vs Grok-4 Heavy.