Claude Sonnet 5 vs Hy4 preview
Claude Sonnet 5 and Hy4 preview are closely matched at 48.3 and 51.0 on the LLM Stats Score.
Anthropic · Tencent · Updated for 2026
Which is better?
Claude Sonnet 5 and Hy4 preview are closely matched on the overall LLM Stats Score at 48.3 and 51.0.
In the 6 individual benchmarks reported for both models, Hy4 preview wins 5; 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 Sonnet 5
- you want predictable pricing at $2.00/M input and $10.00/M output
Choose Hy4 preview
- you value its reported benchmark strengths — it wins 5 of 6 exact shared results
- 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.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
23 reported for Claude Sonnet 5 · 32 for Hy4 preview
Claude Sonnet 5 outperforms in 1 benchmarks (ArXivMath), while Hy4 preview is better at 5 benchmarks (AutomationBench, OfficeQA Pro, SWE-bench Multilingual, SWE-Bench Pro, Toolathlon).
Hy4 preview significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Claude Sonnet 5 specifies input context (1,000,000 tokens). Only Claude Sonnet 5 specifies output context (64,000 tokens).
Input capabilities
Documented input modalities across available providers
Claude Sonnet 5 supports multimodal inputs, whereas Hy4 preview does not.
Claude Sonnet 5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Sonnet 5
Hy4 preview
License
Usage and distribution terms
Claude Sonnet 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 Sonnet 5 was released on 2026-06-30, while Hy4 preview was released on 2026-08-28.
Hy4 preview is 2 months newer than Claude Sonnet 5.
Jun 30, 2026
2 months ago
Aug 28, 2026
3 weeks ago
1mo 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 Claude Sonnet 5 and Hy4 preview side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Sonnet 5 vs Hy4 preview.