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v0.20.0

#model-release #version-bump #inference

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vLLM v0.20.0

Highlights

This release features 752 commits from 320 contributors (123 new)!

  • DeepSeek V4: Initial DeepSeek V4 support landed (#40860), with DSML token-leakage fix in DSV4/3.2 (#40806), DSA + MTP IMA fix (#40772), and a silu clamp limit on the shared expert (#40950).
  • CUDA 13.0 default: Default CUDA wheel on PyPI and vllm/vllm-openai:v0.20.0 image switched to CUDA 13.0; architecture lists and build-args cleaned up (#39878), and CUDA bumped to 13.0.2 to match PyTorch 2.11.0 (#40669). As a general rule of thumb, our CUDA version policy follows PyTorch's. We highly recommend to install vLLM with uv and use --torch-backend=cu129 if you are on CUDA 12.9.
  • PyTorch 2.11 upgrade (#34644): vLLM ships on torch 2.11 for CUDA, and XPU is now also on torch 2.11 (#37947) — XPU is no longer pinned to 2.10. This is a breaking change for environment dependency.
  • Python 3.14: Added to the supported Python version list (#34770).
  • Transformers v5: vLLM now runs on HuggingFace transformers>=5 (#30566), with vision-encoder torch.compile bypass (#30518) and continued v4/v5 compat fixes including PaddleOCR-VL image processor max_pixels (#38629), Mistral YaRN warning (#37292), and Jina ColBERT rotary inv_freq recompute (#39176).
  • New large models: Hunyuan v3 (Hy3) preview (#40681) with HYV3 reasoning parser (#40713); Granite 4.1 Vision as a built-in multimodal model (#40282).
  • FlashAttention 4 as default MLA prefill: FA4 re-enabled as the default MLA prefill backend (#38819) with head-dim 512 and paged-KV support on SM90+ (#38835), plus an upstream FA4 sync (#38690).
  • TurboQuant 2-bit KV cache: New attention backend delivering 2-bit KV cache compression with 4× capacity (#38479), now with FA3/FA4 prefill support (#40092).
  • Online quantization frontend: New end-to-end online quantization frontend (#38138), with docs (#39736); experts_int8 consolidated into the FP8 online path (#38463); MXFP8 online quant moved to the new frontend (#40152).
  • vLLM IR: Initial IR skeleton with rms_norm op (#33825), OOT-platform kernel imports (#38807), gemma_rms_norm reworked on IR (#39014), and IR op testing/benchmarking infra added (#40167) — foundation for future kernel work.
  • Model Runner V2 advances: Eagle prefill full-CUDA-graph (#37588), auto-resolve cudagraph mode/sizes from attention backend (#32936), fused probabilistic rejection sample kernels (#38496), config validation for unsupported features (#38758), piecewise-fallback disabled for eagle draft decodes (#39773), multiple prompt-logprobs support (#39937), prefill warmup coverage (#40746), and a fix for accuracy regression caused by stale sampled/draft tokens (#39833).
  • MoE refactor series: Unquantized migrated to Full Oracle Flow (#36286), CT W8A8 to Oracle (#39187), SharedExperts class (#35153), SharedFusedMoE removed (#35782), DefaultMoERunner split (#35326) and later combined back into MoERunnerBase (#40560), shared/fused expert output sum moved into MoERunnerBase (#35949), ZeroExpertFusedMoE in new framework (#35549), compressed_tensors_moe.py split (#38960), GPTQMarlinMoEMethod reworked with MK (#37990), XPU & CUTLASS MoE relocated to fused_moe/experts/ (#40568, #40574), make_expert_params_mapping renamed (#40671), MoE LoRA refactor (#40338), and MoE DP chunking removed (#39107).
  • Performance: Optimize batch invariant with fused rms norm — 2.1% E2E latency improvement (#40413); avoid seq_lens_cpu GPU→CPU sync (#40654); cache InductorPass.hash_source (#39328); skip FX-graph deserialization on loading for faster warm compile (#40151); CUDAGraph memory profiling enabled by default for clearer startup memory accounting (#38284).

Model Support

  • New architectures: DeepSeek V4 (#40860), Hunyuan v3 preview (#40681), Granite 4.1 Vision (#40282), EXAONE-4.5 (#39388), BharatGen Param2MoE (#38000), Phi-4-reasoning-vision-15B (#38306), Cheers multimodal (#38788), telechat3 (#38510), FireRedLID (#39290), jina-reranker-v3 (#38800), Jina Embeddings v5 (#39575), Nemotron-v3 VL Nano/Super (#39747).
  • Gemma4 series: fast prefill (#38879), quantized MoE (#39045), Eagle3 (#39450), block-local attention + YaRN for Gemma3 (#39823), bidirectional vision attention for sliding layers (#40534), token-repetition fix via dynamic BOS (#39842), multimodal embedder norm-order fix (#40411), plus a string of streaming/tool-call fixes (#38844, #38909, #38992, #39114, #39679, #39027).
  • Quantization formats: GGUF support for MiniMax-M2.1 (#36965), non-standard GGUF quant types with prefix such as UD-IQ1_S (#39471).
  • Speculative decoding: Eagle3 for MiniMax-M2 (#37512), Eagle3 for Gemma4 (#39450).
  • LoRA: Qwen3ASRForConditionalGeneration (#37247), Gemma4ForConditionalGeneration (#39291, #38844), DeepSeek V3.2 (#35077), Qwen3.5 / Step3.x expert base_layer extension (#37114), MoE LoRA refactor (#40338), dual-CUDA-streams linear layer (#35721).
  • Multimodal MRoPE refresh: mm_features-based MRoPE for Ernie-4.5 VL (#39753), Keye-VL / Keye-1.5-VL (#39869), PaddleOCR-VL (#39888).
  • Other: Nano-Nemotron-VL static image inputs fix (#40724); Qwen3 MoE no longer calls gate twice (#40664); DeepSeek V2-Lite accuracy drop fix (#40673); Parakeet UX / perf enhancements (#39423); ColModernVBERT updated for latest HF checkpoint (#39307); NemotronH default mamba_ssm_cache_dtype=float32 with NemotronHNanoVLV2 auto-hook (#39032); new TP plan styles for the Transformers backend (#40467); GLM-5.1 fix on ROCm (#40763).

Engine Core

  • Model Runner V2: Full CUDA graph for eagle prefill (#37588), auto cudagraph mode/sizes based on attention backend (#32936), fused probabilistic rejection-sample kernels (#38496), config validation (#38758), eagle-draft piecewise fallback disabled (#39773), multiple prompt logprobs (#39937), prefill warmup coverage (#40746), stale sampled/draft tokens accuracy fix (#39833).
  • vLLM IR: IR skeleton + rms_norm (#33825), OOT kernel import hooks (#38807), gemma_rms_norm on IR (#39014), IR op testing/benchmarking infra (#40167).
  • torch.compile: Opaque Objects on torch 2.11 (#39286), AOT compile with batch-invariance mode (#39201), Inductor cache nested under AOT dir (#39718), split FX graph via codegen (#38657), Inductor pre-grad passes re-enabled for torch≥2.12 (#38944), strings in custom ops without compile regressions (#38123), MLA + group FP8 fusion (#38877), SiluMul activation+quant fusion refactor (#39684), donate_graph_module=True for standalone_compile (#39733), skip FX graph deserialization on loading (#40151), include Inductor & functorch configs in compile-cache key (#40627), respect TORCH_COMPILE_DISABLE at vLLM config level (#40715), disable Sequence Parallelism for piecewise compilation (#38373).
  • Attention: FA4 as default MLA prefill (#38819), head-dim 512 + paged-KV on sm90+FA4 (#38835), FA4 upstream sync (#38690), full CUDA graph for FlexAttention (#36298), FlexAttention non-causal support (#40394), unified 2D/3D triton_unified_attention (#40631), TRTLLM minimax_allreduce_rms ported (#37045), concat_mla_q half-types only (#37892), batch-invariance-aware backend auto-selection (#40193), avoid seq_lens_cpu GPU→CPU sync (#40654).
  • Helion kernels: torch.compile support for Helion kernels (#38592).
  • HMA / KV offload: GPU-side KV events for HMA (#37688), group block hashes/IDs tracked (#37109), unified memory layout for offloading workers (#37206), shutdown() on OffloadingConnector (#39182), request context passed through KV offload (#39185), sliding-window lookup (#36645), multi-group worker transfer (#38453), multi-KV-group lookup/load/store (#39401, #39402, #39403).
  • Features: NUMA binding for GPU workers (#38635), opt-in VLLM_MEDIA_CACHE media URL caching (#37123), safe request abort when FSM fails to advance (#38663), KV connector prioritized over internal registry (#38301), CUDAGraph memory profiling on by default (#38284), shared-expert overlap restored (#39222), CONFIG_REGISTRY config-class lookup fix when on-disk model_type differs (#39554), workspace-resize GPU memory leak fix (#39226), SWA/chunked-local runtime admission capped to startup pool-sizing bound (#40946).
  • Pluggable layers: Applied to llm_head / vocab embedding (#33465) and MoE layers (#33556).
  • Mamba: Stochastic rounding (#35753), different Conv state layouts (#37416), FlashInfer selective_state_update (#36162).
  • Metrics & scheduling: Labeled waiting-breakdown (capacity/deferred) metric (#38435), API server handshake simplified (#39364), mm-scheduler get_num_embed overhead reduced (#40143), request_id on FinishedRequestStats (#39710).
  • Executor: RayExecutorV2 introduced (#36836); unified engine process monitoring with Ray backend (#35862).

Hardware & Performance

  • NVIDIA: swapAB support for SM120 CUTLASS blockwise FP8 GEMM (#38325), MXFP4 W4A4 CUTLASS MoE for SM100 (#37463), TRTLLM GEN NVFP4 MoE with non-512-aligned hidden dims via weight padding (#39510), TRTLLM FP8 MoE with shuffled weights + BlockMajorK layout (#38993), fused qknorm+rope kernel on SM9.0 (#37376), tuned fused_moe config for RTX PRO 6000 Blackwell (#39183), ViT full CUDA graph for Qwen3-VL video (#38061), --enable-vit-cuda-graph for VLM examples (#40580), default max_frames_per_batch auto-infer for ViT CG video (#40445), fused FP8 output quantization into merge_attn_states (#36518), batched KV-cache swap via cuMemcpyBatchAsync (#38460), sm_110 (Jetson Thor) added to CUDA 13.0 build targets (#39233).
  • AMD ROCm: ZenCPU / AMD Zen CPU backend via zentorch (#39967), RDNA 3.5/4 device IDs (gfx1150/1151/1201) (#38455), gfx1102/gfx1103 added (#40037), MORI EP for unquantized MoE with AITER (#37529), MoRI build with AMD AINIC stack (#38371), MoRI-IO message format aligned with P2pNcclConnector and vllm-router (#39565), MORI prefill/decode API correction (#39835), AITER gemm w8a8 ptpc integration (#33773), TritonW4A16LinearKernel (#37352), asymmetric INT8 in TritonInt8ScaledMMLinearKernel (#38501), fused_silu_mul_block_quant enabled (#38817), KV-cache shuffle for paged_attention_common (#32914), MLA decode output zero-fill removed in AITER (#37539), MLA dual RMS norm fusion pass for DeepSeek/Kimi-K2 (#39242, with older-AITer guard #40386), AITER MLA + Eagle3 spec decode (#39616), DFlash on ROCm (#39703), wvSplitK FP8 path for RDNA (#37712), GPU↔NUMA-node detection (#40015), non-causal attention in ROCM_ATTN (#40176), engine-shutdown GPU memory leak fix (#38503), score-correction-bias dtype cast for DeepSeek/Kimi-K2 (#39999).
  • Intel XPU: torch 2.11 upgrade for XPU (#37947) — no longer pinned to 2.10, initial GDN attention for Qwen3-Next / Qwen3.5 (#33657), torch.compile for XPU GDN attention (#39466), XPU MXFP8 quant op (#38682), XPU MXFP4 quant op (#39857), per-channel FP8 linear (#38316), FP8 KV cache on XPU (#37731), round_int8 for Intel Triton (#38825), MoE Triton in online FP8 quantization fix (#40109), current_platform.supports_fp8() updated for TritonExperts (#40132), NIXL import on XPU fix (#40430), fusion-pattern support disabled on XPU (#39789).
  • CPU: CPU draft-model speculative decoding (#32662), CPU int8 compute mode in AWQ (#35697), head_size 512 in cpu_attn (#38676), gelu in cpu_fused_moe (#38770), OMP replacement (#36487), BF16 GELU LUT on ARM (#37469), W4A16 Autoround on CPU (#38192), CPU affinity/memory mgmt refactor (#39781), IBM Z s390x torch 2.11 builds (#39910), faster exp routine for lower-precision dtypes (#38112), inter-node pipeline parallel fix (#40150), RISC-V multiple RVV VLEN targets (#39478), RISC-V platform detection fix (#40427), exp() input clamp to prevent NaN on CPU/RISC-V (#40428).
  • TPU: tpu-inference upgraded to 0.18.0 (#40395).
  • DeepSeek / MLA / Indexer: Persistent TopK scheduler for DSV3.2 DSA decode (#37421), DSV3.2 indexer fused weights projection (#38684), Triton MLA perf fixes (#33529), indexer WK upcast to BF16 for fusion (#38928), MLA indexer uniform-decode optimization for MTP>1 (#39458), DSA + MTP IMA fix (#40772).
  • GDN / Mamba: Kernel fusion in GDN (#37813), TMA aligned with upstream FLA (#38981), GPU↔CPU syncs eliminated in prefill and spec-decode paths (#38361, #38047).
  • Other: DeepGEMM integrated into the vLLM wheel via CMake (#37980), Lustre FS checkpoint prefetching enabled by default (#39422), Gemma4 fused routing Triton kernel (#39083), Gemma4 embed_input_ids GPU/CPU sync removed (#39234), Nemotron VL image/video preprocessing optimized (#40283), SiLU block-quant fusion v1 (#32996), bilinear_pos_embed Triton kernel for ViT (#37948), mean-pooling optimization (~5.9% throughput) (#38559), redundant-sync removal for pooling (~3.7% throughput) (#39113), H2D pageable-memory copy reduction (#38794), fused zero initializer for FP8 DeepGemm block-quant (#39547), batch-invariant fused-rms-norm 2.1% E2E latency improvement (#40413), InductorPass.hash_source cached (#39328), humming quantization kernel (#34556).

Large Scale Serving

  • EPLB: Alternative communication for EPLB weight exchange (#33176), nixl-based EPLB communicator (#36276), mapping optimization with router record for prefill (#36261), TransferMetadata consolidation (#37341), Async EPLB synchronization refactor (#37601), asyncio infrastructure removed from Async EPLB (#40730), replica-selection bias fix in fused_moe router (#40810), Async EPLB integration test added (#40168).
  • WideEP: Naive all2all replaced by allgather + reducescatter (#33728).
  • KV Offload / Connector: 3FS KVConnector (#37636), unified memory layout for offloading workers (#37206), cache_salt propagated through MP connector for per-user isolation (#39837), multi-connector metrics of same type (#40010), LMCache block-allocation event (#38856), LMCache MP save optimization with MLA (#38810), num_lmcache_extra_cached_token in KVTransferParams (#39843), offload all KV blocks during prefill in P/D (#40346), DP control bundle pinned to first GPU's node on Ray (#39167), FlashInfer NVLink MNNVL workspace sized to EP group (#40893).
  • Disaggregated / NIXL / Mamba: Full PD support for Mamba2-like models on Heterogeneous TP deployments (#37635), Nixl bumped to 0.10.1 (#39922), TpKVTopology + HeteroTPTransferConfig unified into TransferTopology (#39529), NIXL EP treated as batched experts in fused_moe (#40412).

Quantization

  • New formats & methods: TurboQuant 2-bit KV cache compression (#38479) with FA3/FA4 prefill (#40092), per-token-head INT8/FP8 KV cache quantization (#38378), fused FP8/NVFP4 output quantization in MLA attention (#35792), NVFP4 dense models on MI300/MI355X and Hopper via emulation (#35733), NVFP4 MoE emulation fallback for H100/MI300/MI350 (#35737), humming quantization kernel (#34556).
  • Kernels: MXFP8 in Marlin GEMM/MoE with Mxfp8LinearOp refactor (#34664), MXFP4 W4A4 CUTLASS MoE for SM100 (#37463), NVFP4 in reshape_and_cache_flash (#37332), batch-invariant NVFP4 linear (#39322), FlashInfer CuteDSL batched-experts backend for NVFP4 MoE (#38251), special GptOssMxfp4MoeMethod (#39604), W4A8_FP8 MoE TP>1 correctness fix (#40310), NVFP4 CUTLASS MoE OOB-read fix for non-multiple-of-4/16 expert counts (#40351), RMS norm + quant fusion fix on DeepGEMM UE8M0 path for B200 (#40552), Gemma4 quantized MoE (#39045).
  • Compressed tensors: W8A8 MXFP8 linear/MoE (CompressedTensorsW8A8Mxfp8) (#38815), CT W8A8 in Oracle structure (#39187), layerwise reloading of attention/KV quantized models (#38995), experts_int8 consolidated with FP8 online quant (#38463), MXFP8 online quant on the new frontend (#40152).
  • Online quant: Quantized model init failure fix with prefetch offloading (#40432), current_platform.supports_fp8() updated for TritonExperts on XPU/ROCm (#40132).
  • XPU / CPU / AMD: XPU MXFP4 (#39857), XPU MXFP8 GEMM + compressed-tensor schema (#38707), XPU FP8 per-channel linear (#38316), FP8 KV cache on XPU (#37731), CPU W4A16 Autoround (#38192), XPU W4A16 Autoround (#37986), asymmetric INT8 TritonInt8ScaledMMLinearKernel on ROCm (#38501), Quark W8A8 INT8 MoE inference (#36320).
  • Deprecations: Petit NVFP4 removed (#32694).

API & Frontend

  • OpenAI / Anthropic API: presence_penalty / frequency_penalty on Responses API (#38613), Responses API streaming migrated to unified parser (#38755), tool_choice / tools validation on Responses to match OpenAI (#40399), Mistral Grammar factory (#38150), multimodal support on /inference/v1/generate (#38405), max_tokens_per_doc in rerank (#38827), Generative Scoring (#34539), MaxSim re-enabled on GPU (#38620), chat_template_kwargs on Anthropic /v1/messages (#40125), auto-detection of reasoning_config when only reasoning_parser is set (#38214), reasoning parsers can access model config via adjust_request (#37848, #39027), effective chat-template kwargs passed to reasoning parsers (#40460), reasoning parsers expose reasoning_start_str/reasoning_end_str (#40566).
  • Pooling ecosystem: Pooling entrypoints overhauled across scoring (#28631), pooling (#39153), and cleanup (#39675); preprocessing/postprocessing offloaded to thread pool (#39763); async scheduling disabled by default for pooling (#39592); logit_scale added to PoolerConfig (#39435), then renamed logit_bias/logit_scale → logit_mean/logit_sigma for affine score calibration (#39530) — breaking. LLM.reward deprecated; use LLM.encode instead (#40688).
  • gRPC / streaming: Streaming on token-generation endpoint (#37171); gRPC periodic stats logging + servicer log forwarding (#38333); standard grpc.health.v1 health check for Kubernetes-native probes (#38016).
  • Tool / reasoning parsers: Treat <tool_call> as implicit reasoning end in Qwen3 (#35687), is_reasoning_end_streaming() override for GptOssReasoningParser (#35745), Mistral tool parser HF-tokenizer fix (#39294), Mistral pre-v11 tool parser trailing-output fix (#40531), Gemma4 streaming HTML duplication / JSON corruption / null-as-string fixes (#38909, #38992, #39114, #39679), HF tokenizer concurrent-borrow fix in tool parsers (#40059), HYV3ReasoningParser no longer mutates chat_template_kwargs (#40713).
  • Multimodal: Externally processed mm_kwargs with cache injection (#39502), PyAV video backend for concurrent decoding (#39986), custom video metadata for pre-extracted frame sequences (#40133), image+video mixed inputs (per prompt) for VLM examples (#40335), deepstack buffer optimized for Qwen3 multimodal (#40145), readonly multimodal processor warmup during renderer startup (#40797), mm_processor_kwargs forwarded in offline generate APIs (#40251), normalize malformed dict prompts that carry token IDs in prompt (#40339), hotwords for FunASR (#39674), bundle get_generation_prompt() params into SpeechToTextParams (#36268).
  • Frontend / vLLM Omni: --omni delegates to vLLM Omni (#40744); avoid eager import of mistral_common (#40043).
  • LLM / CLI: Structured-output special tokens preserved in offline LLM.chat (#39352), use_audio_in_video passable at vllm serve for nemotron-nano-vl (#38538), deferred imports save ~2s CLI startup (#40056), improved MM-input-too-long error message (#39409), warning when FP8 KV cache misses prefill query quant (#39752), clearer DCP error message (#28443), --model deprecation warning updated (#39518), Mimo reasoning/tooling parsers mapped (#40089), human-readable k/K/m/M… suffix in JSON CLI args (#40473).

Spec Decode

  • Eagle3 for MiniMax-M2 (#37512), Eagle3 for Gemma4 (#39450), AITER MLA + Eagle3 on ROCm (#39616).
  • TurboQuant FA3/FA4 for prefill paths (#40092).
  • Mamba: default to 'align' cache mode for Mamba-based models when speculative decoding is enabled (#40454).
  • Unified Synthetic Acceptance Rate for V1 and V2 (#40662); SpecDecodeBaseProposer moved out of eagle.py (#40732); DSA + MTP IMA fix (#40772).

Security

  • SSRF fix in batch runner download_bytes_from_url (#38482).

Dependencies

  • PyTorch 2.11 for CUDA (#34644) and XPU (#37947) — XPU no longer pinned to 2.10.
  • CUDA 13.0 default with updated architecture lists and cleaned build-args (#39878); CUDA bumped to 13.0.2 to match PyTorch 2.11.0 (#40669); sm_110 (Jetson Thor) added (#39233).
  • Python 3.14 added to supported versions (#34770).
  • Transformers v5 (#30566), with vision-encoder torch.compile bypass (#30518) and continued v4/v5 compat fixes.
  • FlashAttention 4 upstream sync (#38690) and symlink-on-install behavior (#38814).
  • FlashInfer bumped to 0.6.8 (#39959).
  • AITER triton BUFFER_OPS fix + version updates (#38580), AITER reverted to v0.1.10.post3 (#39509); Nixl bumped to 0.10.1 (#39922) and pinned per CUDA major in CI (#39851); DeepGEMM integrated into the wheel via CMake (#37980); fastsafetensors added to NVIDIA Dockerfile (#38950); Helion bumped 0.3.2 → 0.3.3 (#38062).
  • Removed / moved: resampy dependency dropped (#39524), librosa direct dependency dropped (#39079), pyav and soundfile moved to common requirements (#39997).

Breaking Changes

  1. PyTorch 2.11 + CUDA 13.0(.2) default — environment dependency change, now applied to XPU as well.
  2. Transformers v5 is the supported baseline (#30566).
  3. Metrics rework: vllm:prompt_tokens_recomputed removed (#38709); num_cached_tokens / num_external_computed_tokens replaced with PrefillStats (#37460).
  4. Pooler config rename: logit_bias/logit_scale → logit_mean/logit_sigma (#39530).
  5. Async scheduling default OFF for pooling models (#39592).
  6. CUDAGraph memory profiling now ON by default (#38284) — startup memory accounting changes.
  7. Petit NVFP4 quantization removed (#32694); LLM.reward deprecated, use LLM.encode (#40688); cprofile / cprofile_context deprecated (#39100); V0 accept output buffer deprecated (#39125).

V0 Deprecation

  • Petit NVFP4 (#32694), accept output buffer in attention (#39125), cprofile / cprofile_context (#39100), LLM.reward offline API (#40688).

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