Model Comparison

Grok-1.5 vs Phi 4 Reasoning

Phi 4 Reasoning significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Grok-1.5 outperforms in 0 benchmarks, while Phi 4 Reasoning is better at 2 benchmarks (GPQA, MMLU-Pro).

Phi 4 Reasoning significantly outperforms across most benchmarks.

Fri May 15 2026 • llm-stats.com

Arena Performance

Human preference votes

License

Usage and distribution terms

Grok-1.5 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.

Grok-1.5

Proprietary

Closed source

Phi 4 Reasoning

MIT

Open weights

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Phi 4 Reasoning was released on 2025-04-30.

Phi 4 Reasoning is 13 months newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.1 years ago

Phi 4 Reasoning

Apr 30, 2025

1.0 years ago

1.1yr newer

Knowledge Cutoff

When training data ends

Phi 4 Reasoning has a documented knowledge cutoff of 2025-03-01, while Grok-1.5'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 Grok-1.5's cutoff date.

Grok-1.5

—

Phi 4 Reasoning

Mar 2025

Outputs Comparison

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Key Takeaways

xAI

No standout differentiators in the data we have for this pair.

Microsoft
Has open weights
Higher GPQA score (65.8% vs 35.9%)
Higher MMLU-Pro score (74.3% vs 51.0%)

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-1.5
Microsoft
Phi 4 Reasoning

FAQ

Common questions about Grok-1.5 vs Phi 4 Reasoning.

Which is better, Grok-1.5 or Phi 4 Reasoning?

Phi 4 Reasoning significantly outperforms across most benchmarks. Grok-1.5 is made by xAI and Phi 4 Reasoning is made by Microsoft. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok-1.5 compare to Phi 4 Reasoning in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Phi 4 Reasoning scores FlenQA: 97.7%, HumanEval+: 92.9%, IFEval: 83.4%, OmniMath: 76.6%, AIME 2024: 75.3%.

What are the main differences between Grok-1.5 and Phi 4 Reasoning?

Key differences include licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-1.5 and Phi 4 Reasoning?

Grok-1.5 is developed by xAI and Phi 4 Reasoning is developed by Microsoft.