v0.29.0

Highlights

This release features 594 commits from 277 contributors (91 new)!

• Model Runner V2 is now the default for all models (#53183), completing the rollout that began with pooling models (#48290). MRV2 also gained CUDA graph memory profiling for KV cache auto-sizing (#53306), batch-sharded sampling that cuts per-step logits memory by 1/TP (#50465), prompt embeds (#42963), extract_hidden_states speculation (#49811), padded FULL cudagraph dispatch for uniform decode under spec decode (#53407), and DP-sync skipping before EAGLE/MTP draft prefill (#53694). MRV1 remains in use for a few ROCm models and features MRV2 does not yet support.
• New models: Hy4-preview, Tencent's 770B/49B-active MoE with Gated DeepSeek Sparse Attention and native MTP (#54160); Qwen3.8-Flash-Next with BF16/FP8/NVFP4 and MTP (#53896); GraniteSWA and GraniteMoeSWA (#52706); NemotronH_Omni_Reasoning_V3 with MTP (#52929, #53121); Kimi K3 NVFP4 checkpoints (#53132).
• Kimi-K3 and DeepSeek V4 performance: fused MXFP4 top-k finalization in the K3 latent tail (about 5% E2E latency, #53152), K3 Mamba metadata preparation in one Triton launch (6.6-7.6x kernel speedup, #52388), tuned Hopper low-latency GEMM (#54088) now also dispatched on SM100 (#53534) and used for eh_proj (12.9-25.2% kernel speedup, #53942), GEMM-RS extended to GEMM-AR (#53053), MLA gate merged into the QKV-A projection (#54015), K3 DCP with DSpark (#52188) and DCP partial prefix cache hits (#50493); DeepSeek V4 shared experts fused into MegaMoE (#53040), adaptive top-k width re-landed (#52823), a native SwiGLU clamp kernel for Humming MoE (#53685), and an opt-in FlashInfer moe_ep expert backend (#49636).
• Speculative decoding: per-request acceptance stats in OpenAI API responses via --per-request-spec-decode-metrics (#48915), adaptive verification extended to logprobs (#52242), SM100 sparse MLA for GLM-5.2 (#52783) and DeepSeek V4 on SM90 (#52795), Qwen3-Omni DSpark drafts (#52560), PLaMo3 EAGLE-3/DFlash (#54239), and DFlash2 loading from speculators format (#53797).
• RL weight sync: a new sharded_rdt P2P backend where each worker pulls only its TP/EP slice over NIXL or Ray Direct Transport (#43375), rank-local IPC weight updates (#52497), sparse checkpoint-coordinate updates through native weight loaders (#50723, #53751), and routed expert loading for gpt-oss (#52209).
• Mamba prefix caching: internal prefill checkpoints deliver a 9%-25% TTFT improvement (#52789); prefix_cache_retention_interval is now a CLI argument defaulting to 0 (#52216), with dense retention automatically restored for hybrid models using EAGLE/MTP (#55760, #55861).
• New defaults: FlashInfer all-reduce enabled by default for TP CUDA groups, opt out with VLLM_ALLREDUCE_USE_FLASHINFER=0 (#52998); prefix-cache NONE_HASH is deterministic by default so distributed KV cache users no longer need to pin PYTHONHASHSEED (#51875); new --max-num-queued-reqs / --max-num-queued-tokens admission-control flags (#49445).
• Breaking changes: ten deprecated model architectures removed (#53608); FlexOlmo, Olmo3 and Hunyuan V1/VL migrated to the Transformers modeling backend (#53615); PyAV video decoder backend removed (#54231); python -m vllm.entrypoints.openai.api_server deprecated in favor of vllm serve (#52131); VLLM_TEST_FORCE_FP8_MARLIN (#52182) and VLLM_ROCM_USE_AITER_FP4_ASM_GEMM (#53141) removed.

[余略，详见 https://github.com/vllm-project/vllm/releases/tag/v0.29.0]