Model Comparison

Grok Code Fast 1 vs Phi-3.5-vision-instructWhich is better in 2026?

Comparing Grok Code Fast 1 and Phi-3.5-vision-instruct across benchmarks, pricing, and capabilities.

Verdict: Grok Code Fast 1 vs Phi-3.5-vision-instruct — which is better?

Grok Code Fast 1 (by xAI) and Phi-3.5-vision-instruct (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.

Choose Grok Code Fast 1 if…

  • you want the most recent training data — it shipped Aug 2025

Choose Phi-3.5-vision-instruct if…

  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok Code Fast 1 and Phi-3.5-vision-instructdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok Code Fast 1 specifies input context (256,000 tokens). Only Grok Code Fast 1 specifies output context (10,000 tokens).

xAI
Grok Code Fast 1
Input256,000 tokens
Output10,000 tokens
Microsoft
Phi-3.5-vision-instruct
Input- tokens
Output- tokens
Sat Jul 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Phi-3.5-vision-instruct supports multimodal inputs, whereas Grok Code Fast 1 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 Code Fast 1

Text
Images
Audio
Video

Phi-3.5-vision-instruct

Text
Images
Audio
Video

License

Usage and distribution terms

Grok Code Fast 1 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 Code Fast 1

Proprietary

Closed source

Phi-3.5-vision-instruct

MIT

Open weights

Release Timeline

When each model was launched

Grok Code Fast 1 was released on 2025-08-28, while Phi-3.5-vision-instruct was released on 2024-08-23.

Grok Code Fast 1 is 12 months newer than Phi-3.5-vision-instruct.

Grok Code Fast 1

Aug 28, 2025

10 months ago

1.0yr newer
Phi-3.5-vision-instruct

Aug 23, 2024

1.9 years ago

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→

Key Takeaways

xAI
Larger context window (256,000 tokens)
Microsoft
Supports multimodal inputs
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Grok Code Fast 1 and Phi-3.5-vision-instruct side-by-side, then vote on the output you prefer.

Grok Code Fast 1
✓ Preferred
Phi-3.5-vision-instruct
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok Code Fast 1
Microsoft
Phi-3.5-vision-instruct

FAQ

Common questions about Grok Code Fast 1 vs Phi-3.5-vision-instruct.

Which is better, Grok Code Fast 1 or Phi-3.5-vision-instruct?

Grok Code Fast 1 (xAI) and Phi-3.5-vision-instruct (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 Code Fast 1 compare to Phi-3.5-vision-instruct in benchmarks?

Grok Code Fast 1 scores SWE-Bench Verified: 70.8%. Phi-3.5-vision-instruct scores ScienceQA: 91.3%, POPE: 86.1%, MMBench: 81.9%, ChartQA: 81.8%, AI2D: 78.1%.

What are the context window sizes for Grok Code Fast 1 and Phi-3.5-vision-instruct?

Grok Code Fast 1 supports 256K tokens and Phi-3.5-vision-instruct supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok Code Fast 1 and Phi-3.5-vision-instruct?

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

Who makes Grok Code Fast 1 and Phi-3.5-vision-instruct?

Grok Code Fast 1 is developed by xAI and Phi-3.5-vision-instruct is developed by Microsoft.

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