Notable Changes

• Add Qwen3-Next by @Qubitium and @LRL-ModelCloud in #1787
• Add Apertus support by @LRL-ModelCloud in #1767
• Add Kimi k2 support by @LRL-ModelCloud in #1768
• Add Klear support by @LRL-ModelCloud in #1769
• Add FastLLM support by @LRL-ModelCloud in #1771
• Add Nemotron H support by @LRL-ModelCloud in #1773
• Add fail_safe option by @LRL-ModelCloud in #1775
• Use threading lock to protect unsafe tensor moves in multi-gpu by @Qubitium in #1778
• Avoid building experimental extensions to reduce wheel size by @Qubitium in #1763

What's Changed

• Fix LlavaQwen2GPTQ by @LRL-ModelCloud in #1772
• Fix Q.to on multi-gpu gptq when proceeding fast and has many experts and gpus by @avtc in #1774
• Bump actions/setup-python from 5 to 6 in the github-actions group by @dependabot[bot] in #1758
• [CI] fix release jobs were skipped by @CSY-ModelCloud in #1759
• ignore compile warns about var declared but not used by @Qubitium in #1760
• allow prebuilt wheel path to be customized via env by @Qubitium in #1761
• add build toggles for all cpp kernels by @Qubitium in #1764
• fix multi gpu inference by @LRL-ModelCloud in #1762
• [CI] reduce wheel download size by @CSY-ModelCloud in #1765
• start 4.2.0-dev cycle by @Qubitium in #1766
• fix klear by @LRL-ModelCloud in #1770
• FIX transformers >= 4.56.1 force changed torch.default_dtype by @Qubitium in #1779
• fix multi gpu fail_safe by @LRL-ModelCloud in #1780
• fix device instance by @LRL-ModelCloud in #1783
• prepare for 4.2 release by @Qubitium in #1785

Full Changelog: v4.1.0...v4.2.0