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Grok-4 Heavy vs Grok 4.6

Comparing Grok-4 Heavy and Grok 4.6 across benchmarks, pricing, and capabilities.

xAI · xAI · Updated for 2026

Which is better?

Grok-4 Heavy and Grok 4.6 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-4 Heavy

  • you are already invested in the xAI ecosystem

Choose Grok 4.6

  • you want predictable pricing at $2.00/M input and $6.00/M output

At a glance

The differences that matter most.

Grok-4 Heavy
xAI
Grok 4.6
xAI
Benchmark wins
—
—
Input price
— / M
$2.00 / M
Output price
— / M
$6.00 / M
Context window
—
500,000
Released
—
Aug 2026
License
Proprietary
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok-4 Heavy and Grok 4.6don'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

Context Window

Maximum input and output token capacity

Only Grok 4.6 specifies input context (500,000 tokens).

xAI
Grok-4 Heavy
Input- tokens
Output- tokens
xAI
Grok 4.6
Input500,000 tokens
Output- tokens
Tue Aug 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok-4 Heavy and Grok 4.6 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 4.6

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 4.6

Proprietary

Closed source

Release Timeline

When each model was launched

Grok 4.6 was released on 2026-08-12, while Grok-4 Heavy's release date is not specified.

We can confirm Grok 4.6's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

Grok-4 Heavy

—

Grok 4.6

Aug 12, 2026

1 weeks ago

Knowledge Cutoff

When training data ends

Grok-4 Heavy has a knowledge cutoff of 2024-12-31, while Grok 4.6 has a cutoff of 2026-02-01.

Grok 4.6 has more recent training data (up to 2026-02-01), making it potentially better informed about events through that date compared to Grok-4 Heavy (2024-12-31).

Grok-4 Heavy

Dec 2024

Grok 4.6

Feb 2026

1.2 yr newer

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok-4 Heavy and Grok 4.6 side-by-side, then vote on the output you prefer.

Grok-4 Heavy
✓ Preferred
Grok 4.6
Open in Playground

FAQ

Common questions about Grok-4 Heavy vs Grok 4.6.

Which is better, Grok-4 Heavy or Grok 4.6?

Grok-4 Heavy (xAI) and Grok 4.6 (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 4.6 in benchmarks?

Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%. Grok 4.6 scores CursorBench v3.2: 69.9%, DeepSWE 1.1: 65.9%, FrontierCode: 61.3%, AA-Index: 61.0%, GDPval-AA: 58.4%.

What are the context window sizes for Grok-4 Heavy and Grok 4.6?

Grok-4 Heavy supports an unknown number of tokens and Grok 4.6 supports 500K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

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