Model Comparison

Granite 3.3 8B Instruct vs Grok-4 HeavyWhich is better in 2026?

Comparing Granite 3.3 8B Instruct and Grok-4 Heavy across benchmarks, pricing, and capabilities.

Verdict: Granite 3.3 8B Instruct vs Grok-4 Heavy — which is better?

Granite 3.3 8B Instruct (by IBM) and Grok-4 Heavy (by xAI) 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 Granite 3.3 8B Instruct if…

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

Choose Grok-4 Heavy if…

  • you are already invested in the xAI ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Granite 3.3 8B Instruct and Grok-4 Heavydon'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 Granite 3.3 8B Instruct specifies input context (128,000 tokens). Only Granite 3.3 8B Instruct specifies output context (8,192 tokens).

IBM
Granite 3.3 8B Instruct
Input128,000 tokens
Output8,192 tokens
xAI
Grok-4 Heavy
Input- tokens
Output- tokens
Tue Jul 28 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Granite 3.3 8B Instruct and Grok-4 Heavy support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Granite 3.3 8B Instruct

Text
Images
Audio
Video

Grok-4 Heavy

Text
Images
Audio
Video

License

Usage and distribution terms

Granite 3.3 8B Instruct is licensed under Apache 2.0, while Grok-4 Heavy uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Granite 3.3 8B Instruct

Apache 2.0

Open weights

Grok-4 Heavy

Proprietary

Closed source

Release Timeline

When each model was launched

Granite 3.3 8B Instruct was released on 2025-04-16, while Grok-4 Heavy's release date is not specified.

We can confirm Granite 3.3 8B Instruct's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

Granite 3.3 8B Instruct

Apr 16, 2025

1.3 years ago

Grok-4 Heavy

—

Knowledge Cutoff

When training data ends

Granite 3.3 8B Instruct has a knowledge cutoff of 2024-04-01, while Grok-4 Heavy has a cutoff of 2024-12-31.

Grok-4 Heavy has more recent training data (up to 2024-12-31), making it potentially better informed about events through that date compared to Granite 3.3 8B Instruct (2024-04-01).

Granite 3.3 8B Instruct

Apr 2024

Grok-4 Heavy

Dec 2024

8 mo newer

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

IBM
Larger context window (128,000 tokens)
Has open weights
xAI

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

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Granite 3.3 8B Instruct and Grok-4 Heavy side-by-side, then vote on the output you prefer.

Granite 3.3 8B Instruct
✓ Preferred
Grok-4 Heavy
Open in Playground
AI Model Comparison Table
Feature
IBM
Granite 3.3 8B Instruct
xAI
Grok-4 Heavy

FAQ

Common questions about Granite 3.3 8B Instruct vs Grok-4 Heavy.

Which is better, Granite 3.3 8B Instruct or Grok-4 Heavy?

Granite 3.3 8B Instruct (IBM) and Grok-4 Heavy (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Granite 3.3 8B Instruct compare to Grok-4 Heavy in benchmarks?

Granite 3.3 8B Instruct scores HumanEval: 89.7%, AttaQ: 88.5%, HumanEval+: 86.1%, AIME 2024: 81.2%, GSM8k: 80.9%. Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%.

What are the context window sizes for Granite 3.3 8B Instruct and Grok-4 Heavy?

Granite 3.3 8B Instruct supports 128K tokens and Grok-4 Heavy 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 Granite 3.3 8B Instruct and Grok-4 Heavy?

Key differences include licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Granite 3.3 8B Instruct and Grok-4 Heavy?

Granite 3.3 8B Instruct is developed by IBM and Grok-4 Heavy is developed by xAI.

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