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Grok-1.5 vs Phi-3.5-vision-instruct

Grok-1.5 and Phi-3.5-vision-instruct are closely matched at -2.5 and -3.2 on the LLM Stats Score.

xAI · Microsoft · Updated for 2026

Which is better?

Grok-1.5 and Phi-3.5-vision-instruct are closely matched on the overall LLM Stats Score at -2.5 and -3.2.

In the 2 individual benchmarks reported for both models, Grok-1.5 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 Grok-1.5

  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results

Choose Phi-3.5-vision-instruct

  • you want the most recent training data — it shipped Aug 2024
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Grok-1.5
xAI
Phi-3.5-vision-instruct
Microsoft
Core performance indexes
LLM Stats Score
-2.5
#328
-3.2
#332
Reasoning
-2.0
#318
-4.6
#329
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Grok-1.5
Phi-3.5-vision-instruct
Vision
-4.8#197
-3.1#190
Multimodal
-2.2#156
-0.6#151
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

9 reported for Grok-1.5 · 9 for Phi-3.5-vision-instruct

2 shared

Grok-1.5 outperforms in 2 benchmarks (MathVista, MMMU), while Phi-3.5-vision-instruct is better at 0 benchmarks.

Grok-1.5 significantly outperforms across most benchmarks.

Sat Sep 05 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Input capabilities

Documented input modalities across available providers

Phi-3.5-vision-instruct supports multimodal inputs, whereas Grok-1.5 does not.

Phi-3.5-vision-instruct can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok-1.5

Text
Images
Audio
Video

Phi-3.5-vision-instruct

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-1.5 is licensed under a proprietary license, while Phi-3.5-vision-instruct 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-3.5-vision-instruct

MIT

Open weights

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Phi-3.5-vision-instruct was released on 2024-08-23.

Phi-3.5-vision-instruct is 5 months newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.4 years ago

Phi-3.5-vision-instruct

Aug 23, 2024

2.0 years ago

4mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok-1.5 and Phi-3.5-vision-instruct side-by-side, then vote on the output you prefer.

Grok-1.5
✓ Preferred
Phi-3.5-vision-instruct
Open in Playground

FAQ

Common questions about Grok-1.5 vs Phi-3.5-vision-instruct.

Which is better, Grok-1.5 or Phi-3.5-vision-instruct?

Grok-1.5 and Phi-3.5-vision-instruct are closely matched on the LLM Stats Score at -2.5 and -3.2. Grok-1.5 is made by xAI and Phi-3.5-vision-instruct is made by Microsoft. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Grok-1.5 compare to Phi-3.5-vision-instruct in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Phi-3.5-vision-instruct scores ScienceQA: 91.3%, POPE: 86.1%, MMBench: 81.9%, ChartQA: 81.8%, AI2D: 78.1%.

What are the main differences between Grok-1.5 and Phi-3.5-vision-instruct?

Key differences include LLM Stats Score (-2.5 vs -3.2), multimodal support (no vs yes), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-1.5 and Phi-3.5-vision-instruct?

Grok-1.5 is developed by xAI and Phi-3.5-vision-instruct is developed by Microsoft.

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