Grok-4 Heavy vs Qwen3.5-397B-A17B
Grok-4 Heavy and Qwen3.5-397B-A17B are closely matched at 40.7 and 38.7 on the LLM Stats Score.
xAI · Alibaba Cloud / Qwen Team · Updated for 2026
Which is better?
Grok-4 Heavy and Qwen3.5-397B-A17B are closely matched on the overall LLM Stats Score at 40.7 and 38.7.
In the 3 individual benchmarks reported for both models, Grok-4 Heavy wins 2; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Grok-4 Heavy
- you value its reported benchmark strengths — it wins 2 of 3 exact shared results
Choose Qwen3.5-397B-A17B
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
6 reported for Grok-4 Heavy · 38 for Qwen3.5-397B-A17B
Grok-4 Heavy outperforms in 2 benchmarks (HMMT25, Humanity's Last Exam), while Qwen3.5-397B-A17B is better at 0 benchmarks.
Grok-4 Heavy shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Qwen3.5-397B-A17B specifies input context (262,144 tokens). Only Qwen3.5-397B-A17B specifies output context (262,144 tokens).
Input capabilities
Documented input modalities across available providers
Both Grok-4 Heavy and Qwen3.5-397B-A17B support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok-4 Heavy
Qwen3.5-397B-A17B
License
Usage and distribution terms
Grok-4 Heavy is licensed under a proprietary license, while Qwen3.5-397B-A17B uses Apache 2.0.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Apache 2.0
Open weights
Release Timeline
When each model was launched
Qwen3.5-397B-A17B was released on 2026-02-16, while Grok-4 Heavy's release date is not specified.
We can confirm Qwen3.5-397B-A17B's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.
—
Feb 16, 2026
7 months ago
Knowledge Cutoff
When training data ends
Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while Qwen3.5-397B-A17B'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 Qwen3.5-397B-A17B's cutoff date.
Dec 2024
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Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-4 Heavy and Qwen3.5-397B-A17B side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-4 Heavy vs Qwen3.5-397B-A17B.