Model Comparison

Grok 4 Fast vs Hy3Which is better in 2026?

Hy3 significantly outperforms across most benchmarks.

Verdict: Grok 4 Fast vs Hy3 — which is better?

Grok 4 Fast (by xAI) and Hy3 (by Tencent) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Grok 4 Fast outperforms in 0 benchmarks, while Hy3 is better at 2 benchmarks (BrowseComp, GPQA). Hy3 significantly outperforms across most benchmarks.

Choose Grok 4 Fast if…

  • you want predictable pricing at $0.20/M input and $0.50/M output

Choose Hy3 if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026
  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Grok 4 Fast outperforms in 0 benchmarks, while Hy3 is better at 2 benchmarks (BrowseComp, GPQA).

Hy3 significantly outperforms across most benchmarks.

Tue Jul 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok 4 Fast specifies input context (2,000,000 tokens). Only Grok 4 Fast specifies output context (30,000 tokens).

xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Tencent
Hy3
Input- tokens
Output- tokens
Tue Jul 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok 4 Fast supports multimodal inputs, whereas Hy3 does not.

Grok 4 Fast can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok 4 Fast

Text
Images
Audio
Video

Hy3

Text
Images
Audio
Video

License

Usage and distribution terms

Grok 4 Fast is licensed under a proprietary license, while Hy3 uses Apache 2.0.

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

Grok 4 Fast

Proprietary

Closed source

Hy3

Apache 2.0

Open weights

Release Timeline

When each model was launched

Grok 4 Fast was released on 2025-08-28, while Hy3 was released on 2026-07-06.

Hy3 is 10 months newer than Grok 4 Fast.

Grok 4 Fast

Aug 28, 2025

10 months ago

Hy3

Jul 6, 2026

2 weeks ago

10mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI
Larger context window (2,000,000 tokens)
Supports multimodal inputs
Tencent
Has open weights
Higher BrowseComp score (84.2% vs 44.9%)
Higher GPQA score (90.4% vs 85.7%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Grok 4 Fast and Hy3 side-by-side, then vote on the output you prefer.

Grok 4 Fast
✓ Preferred
Hy3
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok 4 Fast
Tencent
Hy3

FAQ

Common questions about Grok 4 Fast vs Hy3.

Which is better, Grok 4 Fast or Hy3?

Hy3 significantly outperforms across most benchmarks. Grok 4 Fast is made by xAI and Hy3 is made by Tencent. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok 4 Fast compare to Hy3 in benchmarks?

Grok 4 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%. Hy3 scores DeepSearchQA: 91.0%, GPQA: 90.4%, IMO-AnswerBench: 90.0%, BrowseComp: 84.2%, MCP Atlas: 79.1%.

What are the context window sizes for Grok 4 Fast and Hy3?

Grok 4 Fast supports 2.0M tokens and Hy3 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok 4 Fast and Hy3?

Key differences include multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok 4 Fast and Hy3?

Grok 4 Fast is developed by xAI and Hy3 is developed by Tencent.

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