The AI arena is free today

Open Superagent

Grok Code Fast 1 vs Hy4 preview

Hy4 preview leads the LLM Stats Score 51.0 to 20.7.

xAI · Tencent · Updated for 2026

Which is better?

Hy4 preview leads the overall LLM Stats Score 51.0 to 20.7, ranking #14 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Grok Code Fast 1

  • you want predictable pricing at $0.20/M input and $1.50/M output

Choose Hy4 preview

  • overall performance matters — it scores 51.0 and ranks #14 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • 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.

Grok Code Fast 1
xAI
Hy4 preview
Tencent
Core performance indexes
LLM Stats Score
20.7
#192
51.0
#14
Reasoning
20.6
#185
50.8
#10
Coding
12.9
#140
39.7
#14
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.20 / M
— / M
Output price
$1.50 / M
— / M
Context window
256,000
—

Individual benchmarks

1 reported for Grok Code Fast 1 · 32 for Hy4 preview

No common benchmarks found

Grok Code Fast 1 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 Code Fast 1 specifies input context (256,000 tokens). Only Grok Code Fast 1 specifies output context (10,000 tokens).

xAI
Grok Code Fast 1
Input256,000 tokens
Output10,000 tokens
Tencent
Hy4 preview
Input- tokens
Output- tokens
Mon Sep 21 2026 • llm-stats.com

License

Usage and distribution terms

Grok Code Fast 1 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.

Grok Code Fast 1

Proprietary

Closed source

Hy4 preview

Apache 2.0

Open weights

Release Timeline

When each model was launched

Grok Code Fast 1 was released on 2025-08-28, while Hy4 preview was released on 2026-08-28.

Hy4 preview is 12 months newer than Grok Code Fast 1.

Grok Code Fast 1

Aug 28, 2025

1.1 years ago

Hy4 preview

Aug 28, 2026

3 weeks ago

1.0yr 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→

Judge for yourself.

Run your own prompts against Grok Code Fast 1 and Hy4 preview side-by-side, then vote on the output you prefer.

Grok Code Fast 1
✓ Preferred
Hy4 preview
Open in Playground

FAQ

Common questions about Grok Code Fast 1 vs Hy4 preview.

Which is better, Grok Code Fast 1 or Hy4 preview?

Hy4 preview leads the LLM Stats Score 51.0 to 20.7. Grok Code Fast 1 is made by xAI and Hy4 preview is made by Tencent. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Grok Code Fast 1 compare to Hy4 preview in benchmarks?

Grok Code Fast 1 scores SWE-Bench Verified: 70.8%. Hy4 preview scores GPQA: 92.3%, Terminal-Bench 2.1: 85.4%, WideSearch: 83.9%, MCP Atlas: 83.7%, SWE-bench Multilingual: 82.9%.

What are the context window sizes for Grok Code Fast 1 and Hy4 preview?

Grok Code Fast 1 supports 256K tokens and Hy4 preview 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 Code Fast 1 and Hy4 preview?

Key differences include LLM Stats Score (20.7 vs 51.0), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok Code Fast 1 and Hy4 preview?

Grok Code Fast 1 is developed by xAI and Hy4 preview is developed by Tencent.

Related comparisons