HY4 is Tencent's new 770 billion parameter open model, and it helped build ITSELF.
That's not a cute line. Tencent used the model during its own training to improve how it was trained. Then it tuned its own running system and made itself 30% faster at replying. AI helping
I genuinely did not expect a sub dollar "flash" model to pull this off.
Gemini 3.8 Flash one shotted this entire solar system. Single file, zero tools, zero edits. trading blows with kimi k3 and glm 5.3 on artificial analysis intelligence index. - 73.7 DeepSWE v1.1 (Claude
Claude Fable 5.1, Claude Opus 5, Kimi K3, and GLM-5.3 Flash.
Recreate Girl with a Pearl Earring 👧🖼️
Same model, two names, two doors.
Anthropic announced Claude Fable 5.1 and Claude Mythos 5.1 yesterday. I think this is where the confusion begins. There are different interpretations. These are not separate intelligences. It's actually the same model. The difference here is who can do which job. Fable 5.1 is available to everyone.
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