Model Comparison
Grok-4 Heavy vs Phi 4 Reasoning Plus
Grok-4 Heavy significantly outperforms across most benchmarks.
Performance Benchmarks
Comparative analysis across standard metrics
Grok-4 Heavy outperforms in 3 benchmarks (AIME 2025, GPQA, LiveCodeBench), while Phi 4 Reasoning Plus is better at 0 benchmarks.
Grok-4 Heavy significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Input Capabilities
Supported data types and modalities
Grok-4 Heavy supports multimodal inputs, whereas Phi 4 Reasoning Plus does not.
Grok-4 Heavy can handle both text and other forms of data like images, making it suitable for multimodal applications.
Grok-4 Heavy
Phi 4 Reasoning Plus
License
Usage and distribution terms
Grok-4 Heavy is licensed under a proprietary license, while Phi 4 Reasoning Plus uses MIT.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
MIT
Open weights
Release Timeline
When each model was launched
Phi 4 Reasoning Plus was released on 2025-04-30, while Grok-4 Heavy's release date is not specified.
We can confirm Phi 4 Reasoning Plus's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.
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Apr 30, 2025
1.1 years ago
Knowledge Cutoff
When training data ends
Grok-4 Heavy has a knowledge cutoff of 2024-12-31, while Phi 4 Reasoning Plus has a cutoff of 2025-03-01.
Phi 4 Reasoning Plus has more recent training data (up to 2025-03-01), making it potentially better informed about events through that date compared to Grok-4 Heavy (2024-12-31).
Dec 2024
Mar 2025
3 mo newerOutputs Comparison
Key Takeaways
Phi 4 Reasoning Plus
View detailsMicrosoft
Detailed Comparison
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FAQ
Common questions about Grok-4 Heavy vs Phi 4 Reasoning Plus.