Claude Haiku 5.5 vs Hy4 preview
Claude Haiku 5.5 and Hy4 preview are closely matched at 50.1 and 49.9 on the LLM Stats Score.
Anthropic · Tencent · Updated for 2026
Which is better?
Claude Haiku 5.5 and Hy4 preview are closely matched on the overall LLM Stats Score at 50.1 and 49.9.
In the 5 individual benchmarks reported for both models, Claude Haiku 5.5 wins 3; 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 Claude Haiku 5.5
- you value its reported benchmark strengths — it wins 3 of 5 exact shared results
- you want the most recent training data — it shipped Oct 2026
Choose Hy4 preview
- 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
36 reported for Claude Haiku 5.5 · 32 for Hy4 preview
Claude Haiku 5.5 outperforms in 3 benchmarks (Humanity's Last Exam (no tools, text-only), Program Bench, SWE-bench Multilingual), while Hy4 preview is better at 2 benchmarks (OfficeQA Pro, SWE-Bench Pro).
Claude Haiku 5.5 has a slight edge in benchmark performance.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Claude Haiku 5.5 specifies input context (1,000,000 tokens). Only Claude Haiku 5.5 specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
Claude Haiku 5.5 supports multimodal inputs, whereas Hy4 preview does not.
Claude Haiku 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Haiku 5.5
Hy4 preview
License
Usage and distribution terms
Claude Haiku 5.5 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
Claude Haiku 5.5 was released on 2026-10-07, while Hy4 preview was released on 2026-08-28.
Claude Haiku 5.5 is 1 month newer than Hy4 preview.
Oct 7, 2026
4 days ago
1mo newerAug 28, 2026
1 months ago
Knowledge Cutoff
When training data ends
Claude Haiku 5.5 has a documented knowledge cutoff of 2026-06-01, while Hy4 preview's cutoff date is not specified.
We can confirm Claude Haiku 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Hy4 preview's cutoff date.
Jun 2026
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Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Haiku 5.5 and Hy4 preview side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Haiku 5.5 vs Hy4 preview.