The AI arena is free today

Open Superagent

Claude Fable 5.1 vs Hy4 preview

Claude Fable 5.1 leads the LLM Stats Score 54.8 to 51.5.

Anthropic · Tencent · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 54.8 to 51.5, ranking #5 overall.

The models split the 2 individual benchmarks reported for both models evenly.

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

Choose Claude Fable 5.1

  • overall performance matters — it scores 54.8 and ranks #5 on LLM Stats
  • you want the most recent training data — it shipped Sep 2026

Choose Hy4 preview

  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
Hy4 preview
Tencent
Core performance indexes
LLM Stats Score
54.8
#5
51.5
#11
Reasoning
52.1
#7
51.2
#9
Agents
39.3
#6
37.1
#12
Cost, coverage & limits
Benchmark wins
1 of 2
1 of 2
Input price
$10.00 / M
— / M
Output price
$50.00 / M
— / M
Context window
1,000,000
—

Individual benchmarks

7 reported for Claude Fable 5.1 · 32 for Hy4 preview

2 shared

Claude Fable 5.1 outperforms in 1 benchmarks (GDPval-AA), while Hy4 preview is better at 1 benchmark (AutomationBench).

Both models are evenly matched across the benchmarks.

Tue Sep 01 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Fable 5.1 specifies input context (1,000,000 tokens). Only Claude Fable 5.1 specifies output context (128,000 tokens).

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
Tencent
Hy4 preview
Input- tokens
Output- tokens
Tue Sep 01 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Fable 5.1 supports multimodal inputs, whereas Hy4 preview does not.

Claude Fable 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Fable 5.1

Text
Images
Audio
Video

Hy4 preview

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Fable 5.1 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.

Claude Fable 5.1

Proprietary

Closed source

Hy4 preview

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Hy4 preview was released on 2026-08-28.

Claude Fable 5.1 is 0 month newer than Hy4 preview.

Claude Fable 5.1

Sep 1, 2026

0 days ago

4d newer
Hy4 preview

Aug 28, 2026

4 days ago

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 Claude Fable 5.1 and Hy4 preview side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
Hy4 preview
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Hy4 preview.

Which is better, Claude Fable 5.1 or Hy4 preview?

Claude Fable 5.1 leads the LLM Stats Score 54.8 to 51.5. Claude Fable 5.1 is made by Anthropic 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 Claude Fable 5.1 compare to Hy4 preview in benchmarks?

Claude Fable 5.1 scores OSWorld 2.0: 77.9%, CursorBench v3.2: 73.4%, Humanity's Last Exam: 65.0%, GDPval-AA: 61.8%, Terminal-Bench 4.0: 55.8%. 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 Claude Fable 5.1 and Hy4 preview?

Claude Fable 5.1 supports 1.0M 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 Claude Fable 5.1 and Hy4 preview?

Key differences include LLM Stats Score (54.8 vs 51.5), multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Hy4 preview?

Claude Fable 5.1 is developed by Anthropic and Hy4 preview is developed by Tencent.

Related comparisons