Model Comparison

Grok-4 Heavy vs Grok-4.1Which is better in 2026?

Comparing Grok-4 Heavy and Grok-4.1 across benchmarks, pricing, and capabilities.

Verdict: Grok-4 Heavy vs Grok-4.1 — which is better?

Grok-4 Heavy (by xAI) and Grok-4.1 (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 Grok-4 Heavy if…

  • you are already invested in the xAI ecosystem

Choose Grok-4.1 if…

  • you want predictable pricing at $3.00/M input and $15.00/M output
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok-4 Heavy and Grok-4.1 don'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-4.1 specifies input context (256,000 tokens). Only Grok-4.1 specifies output context (8,000 tokens).

xAI
Grok-4 Heavy
Input- tokens
Output- tokens
xAI
Grok-4.1
Input256,000 tokens
Output8,000 tokens
Sat Jun 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok-4 Heavy and Grok-4.1 support multimodal inputs.

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

Grok-4 Heavy

Text
Images
Audio
Video

Grok-4.1

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Grok-4 Heavy

Proprietary

Closed source

Grok-4.1

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-4.1 was released on 2025-11-17, while Grok-4 Heavy's release date is not specified.

We can confirm Grok-4.1's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

Grok-4 Heavy

—

Grok-4.1

Nov 17, 2025

6 months ago

Knowledge Cutoff

When training data ends

Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while Grok-4.1's cutoff date is not specified.

We can confirm Grok-4 Heavy's training data extends to 2024-12-31, but cannot make a direct comparison without Grok-4.1's cutoff date.

Grok-4 Heavy

Dec 2024

Grok-4.1

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI

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

xAI
Larger context window (256,000 tokens)

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-4 Heavy
xAI
Grok-4.1

FAQ

Common questions about Grok-4 Heavy vs Grok-4.1.

Which is better, Grok-4 Heavy or Grok-4.1?

Grok-4 Heavy (xAI) and Grok-4.1 (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 Grok-4 Heavy compare to Grok-4.1 in benchmarks?

Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%. Grok-4.1 scores FActScore: 97.0%, Creative Writing v3: 85.4%, EQ-Bench: 79.3%, LMArena Text Leaderboard: 73.3%.

What are the context window sizes for Grok-4 Heavy and Grok-4.1?

Grok-4 Heavy supports an unknown number of tokens and Grok-4.1 supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Related comparisons