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Grok-4 Heavy vs Qwen3.8-Flash-Next

Both models are evenly matched across the benchmarks.

xAI · Alibaba Cloud / Qwen Team · Updated for 2026

Which is better?

Grok-4 Heavy outperforms in 1 benchmarks (Humanity's Last Exam), while Qwen3.8-Flash-Next is better at 1 benchmark (GPQA). Both models are evenly matched across the benchmarks.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Grok-4 Heavy

  • you are already invested in the xAI ecosystem

Choose Qwen3.8-Flash-Next

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

At a glance

The differences that matter most.

Grok-4 Heavy
xAI
Qwen3.8-Flash-Next
Alibaba Cloud / Qwen Team
Benchmark wins
1 of 2
1 of 2
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
—
Released
—
Aug 2026
License
Proprietary
Qwen Community License 1.0

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Grok-4 Heavy outperforms in 1 benchmarks (Humanity's Last Exam), while Qwen3.8-Flash-Next is better at 1 benchmark (GPQA).

Both models are evenly matched across the benchmarks.

Wed Aug 26 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Input Capabilities

Supported data types and modalities

Both Grok-4 Heavy and Qwen3.8-Flash-Next support multimodal inputs.

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

Grok-4 Heavy

Text
Images
Audio
Video

Qwen3.8-Flash-Next

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-4 Heavy is licensed under a proprietary license, while Qwen3.8-Flash-Next uses Qwen Community License 1.0.

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

Grok-4 Heavy

Proprietary

Closed source

Qwen3.8-Flash-Next

Qwen Community License 1.0

Open weights

Release Timeline

When each model was launched

Qwen3.8-Flash-Next was released on 2026-08-26, while Grok-4 Heavy's release date is not specified.

We can confirm Qwen3.8-Flash-Next's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

Grok-4 Heavy

—

Qwen3.8-Flash-Next

Aug 26, 2026

0 days ago

Knowledge Cutoff

When training data ends

Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while Qwen3.8-Flash-Next'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 Qwen3.8-Flash-Next's cutoff date.

Grok-4 Heavy

Dec 2024

Qwen3.8-Flash-Next

—

Outputs Comparison

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Judge for yourself.

Run your own prompts against Grok-4 Heavy and Qwen3.8-Flash-Next side-by-side, then vote on the output you prefer.

Grok-4 Heavy
✓ Preferred
Qwen3.8-Flash-Next
Open in Playground

FAQ

Common questions about Grok-4 Heavy vs Qwen3.8-Flash-Next.

Which is better, Grok-4 Heavy or Qwen3.8-Flash-Next?

Both models are evenly matched across the benchmarks. Grok-4 Heavy is made by xAI and Qwen3.8-Flash-Next is made by Alibaba Cloud / Qwen Team. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok-4 Heavy compare to Qwen3.8-Flash-Next in benchmarks?

Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%. Qwen3.8-Flash-Next scores MathVision: 95.7%, LiveCodeBench v6: 91.9%, GPQA: 91.7%, CharXiv-R: 90.6%, RealWorldQA: 88.5%.

What are the main differences between Grok-4 Heavy and Qwen3.8-Flash-Next?

Key differences include licensing (Proprietary vs Qwen Community License 1.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-4 Heavy and Qwen3.8-Flash-Next?

Grok-4 Heavy is developed by xAI and Qwen3.8-Flash-Next is developed by Alibaba Cloud / Qwen Team.

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