Grok-4 Fast Non-Reasoning vs Hy4 preview
Comparing Grok-4 Fast Non-Reasoning and Hy4 preview across benchmarks, pricing, and capabilities.
xAI · Tencent · Updated for 2026
Which is better?
Grok-4 Fast Non-Reasoning and Hy4 preview trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Grok-4 Fast Non-Reasoning
- you want predictable pricing at $0.20/M input and $0.50/M output
Choose Hy4 preview
- 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.
Individual benchmarks
0 reported for Grok-4 Fast Non-Reasoning · 32 for Hy4 preview
Grok-4 Fast Non-Reasoning and Hy4 previewdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Grok-4 Fast Non-Reasoning specifies input context (2,000,000 tokens). Only Grok-4 Fast Non-Reasoning specifies output context (30,000 tokens).
Input capabilities
Documented input modalities across available providers
Grok-4 Fast Non-Reasoning supports multimodal inputs, whereas Hy4 preview does not.
Grok-4 Fast Non-Reasoning can handle both text and other forms of data like images, making it suitable for multimodal applications.
Grok-4 Fast Non-Reasoning
Hy4 preview
License
Usage and distribution terms
Grok-4 Fast Non-Reasoning 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 Fast Non-Reasoning was released on 2025-08-28, while Hy4 preview was released on 2026-08-28.
Hy4 preview is 12 months newer than Grok-4 Fast Non-Reasoning.
Aug 28, 2025
1.1 years ago
Aug 28, 2026
3 weeks ago
1.0yr newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-4 Fast Non-Reasoning and Hy4 preview side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-4 Fast Non-Reasoning vs Hy4 preview.