Grok 4.5 vs Hy4 preview
Grok 4.5 and Hy4 preview are closely matched at 45.5 and 51.1 on the LLM Stats Score.
xAI · Tencent · Updated for 2026
Which is better?
Grok 4.5 and Hy4 preview are closely matched on the overall LLM Stats Score at 45.5 and 51.1.
In the 5 individual benchmarks reported for both models, Hy4 preview wins 4; 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 4.5
- you want predictable pricing at $2.00/M input and $6.00/M output
Choose Hy4 preview
- you value its reported benchmark strengths — it wins 4 of 5 exact shared results
- you want the most recent training data — it shipped Aug 2026
- 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
15 reported for Grok 4.5 · 32 for Hy4 preview
Grok 4.5 outperforms in 1 benchmarks (GPQA), while Hy4 preview is better at 4 benchmarks (DeepSWE, SWE-Bench Pro, SWE-Marathon, Terminal-Bench 2.1).
Hy4 preview significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Grok 4.5 specifies input context (500,000 tokens).
Input capabilities
Documented input modalities across available providers
Grok 4.5 supports multimodal inputs, whereas Hy4 preview does not.
Grok 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Grok 4.5
Hy4 preview
License
Usage and distribution terms
Grok 4.5 is licensed under a proprietary license, while Hy4 preview 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
Grok 4.5 was released on 2026-07-16, while Hy4 preview was released on 2026-08-28.
Hy4 preview is 1 month newer than Grok 4.5.
Jul 16, 2026
1 months ago
Aug 28, 2026
1 weeks ago
1mo newerKnowledge Cutoff
When training data ends
Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while Hy4 preview's cutoff date is not specified.
We can confirm Grok 4.5's training data extends to 2026-02-01, but cannot make a direct comparison without Hy4 preview's cutoff date.
Feb 2026
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Outputs Comparison
Judge for yourself.
Run your own prompts against Grok 4.5 and Hy4 preview side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok 4.5 vs Hy4 preview.