Claude Mythos Preview vs Hy4 preview
Claude Mythos Preview leads the LLM Stats Score 55.7 to 51.5.
Anthropic · Tencent · Updated for 2026
Which is better?
Claude Mythos Preview leads the overall LLM Stats Score 55.7 to 51.5, ranking #3 overall.
In the 4 individual benchmarks reported for both models, Claude Mythos Preview wins 4; 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 Mythos Preview
- overall performance matters — it scores 55.7 and ranks #3 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 4 of 4 exact shared results
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
16 reported for Claude Mythos Preview · 32 for Hy4 preview
Claude Mythos Preview outperforms in 4 benchmarks (CyberGym, GPQA, SWE-bench Multilingual, SWE-Bench Pro), while Hy4 preview is better at 0 benchmarks.
Claude Mythos Preview significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Input capabilities
Documented input modalities across available providers
Claude Mythos Preview supports multimodal inputs, whereas Hy4 preview does not.
Claude Mythos Preview can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Mythos Preview
Hy4 preview
License
Usage and distribution terms
Claude Mythos Preview 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
Hy4 preview was released on 2026-08-28, while Claude Mythos Preview's release date is not specified.
We can confirm Hy4 preview's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.
—
Aug 28, 2026
2 days ago
Knowledge 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 Mythos Preview and Hy4 preview side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Mythos Preview vs Hy4 preview.