Model Comparison
GPT-4o vs Phi 4 ReasoningWhich is better in 2026?
Both models are evenly matched across the benchmarks.
Verdict: GPT-4o vs Phi 4 Reasoning — which is better?
GPT-4o (by OpenAI) and Phi 4 Reasoning (by Microsoft) 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.
GPT-4o outperforms in 2 benchmarks (GPQA, MMLU-Pro), while Phi 4 Reasoning is better at 2 benchmarks (AIME 2024, IFEval). Both models are evenly matched across the benchmarks.
Choose GPT-4o if…
- you want predictable pricing at $2.50/M input and $10.00/M output
Choose Phi 4 Reasoning if…
- you want the most recent training data — it shipped Apr 2025
- you need open weights you can self-host or fine-tune
Performance Benchmarks
Comparative analysis across standard metrics
GPT-4o outperforms in 2 benchmarks (GPQA, MMLU-Pro), while Phi 4 Reasoning is better at 2 benchmarks (AIME 2024, IFEval).
Both models are evenly matched across the benchmarks.
Arena Performance
Human preference votes
Context Window
Maximum input and output token capacity
Only GPT-4o specifies input context (128,000 tokens). Only GPT-4o specifies output context (16,384 tokens).
Input Capabilities
Supported data types and modalities
GPT-4o supports multimodal inputs, whereas Phi 4 Reasoning does not.
GPT-4o can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-4o
Phi 4 Reasoning
License
Usage and distribution terms
GPT-4o is licensed under a proprietary license, while Phi 4 Reasoning 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
GPT-4o was released on 2024-08-06, while Phi 4 Reasoning was released on 2025-04-30.
Phi 4 Reasoning is 9 months newer than GPT-4o.
Aug 6, 2024
2.0 years ago
Apr 30, 2025
1.2 years ago
8mo newerKnowledge Cutoff
When training data ends
Phi 4 Reasoning has a documented knowledge cutoff of 2025-03-01, while GPT-4o's cutoff date is not specified.
We can confirm Phi 4 Reasoning's training data extends to 2025-03-01, but cannot make a direct comparison without GPT-4o's cutoff date.
—
Mar 2025
Outputs Comparison
Key Takeaways
GPT-4o
View detailsOpenAI
Phi 4 Reasoning
View detailsMicrosoft
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-4o and Phi 4 Reasoning side-by-side, then vote on the output you prefer.
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FAQ
Common questions about GPT-4o vs Phi 4 Reasoning.