GPT-4.5 vs Phi 4 Reasoning Plus
GPT-4.5 and Phi 4 Reasoning Plus are closely matched at 19.7 and 14.5 on the LLM Stats Score.
OpenAI · Microsoft · Updated for 2026
Which is better?
GPT-4.5 and Phi 4 Reasoning Plus are closely matched on the overall LLM Stats Score at 19.7 and 14.5.
In the 3 individual benchmarks reported for both models, GPT-4.5 wins 2; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-4.5
- you value its reported benchmark strengths — it wins 2 of 3 exact shared results
Choose Phi 4 Reasoning Plus
- you want the most recent training data — it shipped Apr 2025
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
26 reported for GPT-4.5 · 11 for Phi 4 Reasoning Plus
GPT-4.5 outperforms in 2 benchmarks (GPQA, IFEval), while Phi 4 Reasoning Plus is better at 1 benchmark (AIME 2024).
GPT-4.5 shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only GPT-4.5 specifies input context (128,000 tokens). Only GPT-4.5 specifies output context (4,096 tokens).
Input capabilities
Documented input modalities across available providers
GPT-4.5 supports multimodal inputs, whereas Phi 4 Reasoning Plus does not.
GPT-4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-4.5
Phi 4 Reasoning Plus
License
Usage and distribution terms
GPT-4.5 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
GPT-4.5 was released on 2025-02-27, while Phi 4 Reasoning Plus was released on 2025-04-30.
Phi 4 Reasoning Plus is 2 months newer than GPT-4.5.
Feb 27, 2025
1.7 years ago
Apr 30, 2025
1.5 years ago
2mo newerKnowledge Cutoff
When training data ends
Phi 4 Reasoning Plus has a documented knowledge cutoff of 2025-03-01, while GPT-4.5's cutoff date is not specified.
We can confirm Phi 4 Reasoning Plus's training data extends to 2025-03-01, but cannot make a direct comparison without GPT-4.5's cutoff date.
—
Mar 2025
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-4.5 and Phi 4 Reasoning Plus side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-4.5 vs Phi 4 Reasoning Plus.