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Grok-1.5V vs Phi 4 Reasoning Plus

Comparing Grok-1.5V and Phi 4 Reasoning Plus across benchmarks, pricing, and capabilities.

xAI · Microsoft · Updated for 2026

Which is better?

Grok-1.5V and Phi 4 Reasoning Plus trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Grok-1.5V

  • you are already invested in the xAI ecosystem

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.

Grok-1.5V
xAI
Phi 4 Reasoning Plus
Microsoft
Benchmark wins
—
—
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
—
Released
Apr 2024
Apr 2025
License
Proprietary
MIT

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok-1.5V and Phi 4 Reasoning Plusdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Playground indexes and blind preference scores

Input Capabilities

Supported data types and modalities

Grok-1.5V supports multimodal inputs, whereas Phi 4 Reasoning Plus does not.

Grok-1.5V can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok-1.5V

Text
Images
Audio
Video

Phi 4 Reasoning Plus

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-1.5V 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.

Grok-1.5V

Proprietary

Closed source

Phi 4 Reasoning Plus

MIT

Open weights

Release Timeline

When each model was launched

Grok-1.5V was released on 2024-04-12, while Phi 4 Reasoning Plus was released on 2025-04-30.

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

Grok-1.5V

Apr 12, 2024

2.4 years ago

Phi 4 Reasoning Plus

Apr 30, 2025

1.3 years ago

1.0yr newer

Knowledge Cutoff

When training data ends

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

Grok-1.5V

—

Phi 4 Reasoning Plus

Mar 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok-1.5V and Phi 4 Reasoning Plus side-by-side, then vote on the output you prefer.

Grok-1.5V
✓ Preferred
Phi 4 Reasoning Plus
Open in Playground

FAQ

Common questions about Grok-1.5V vs Phi 4 Reasoning Plus.

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

Grok-1.5V (xAI) and Phi 4 Reasoning Plus (Microsoft) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

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

Grok-1.5V scores AI2D: 88.3%, DocVQA: 85.6%, TextVQA: 78.1%, ChartQA: 76.1%, RealWorldQA: 68.7%. Phi 4 Reasoning Plus scores FlenQA: 97.9%, HumanEval+: 92.3%, IFEval: 84.9%, OmniMath: 81.9%, AIME 2024: 81.3%.

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

Key differences include multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-1.5V and Phi 4 Reasoning Plus?

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

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