diff --git a/benchmarks/single_node/srt-slurm-recipes/dsv4flash/sglang/b300-fp4-mtp/8k1k.yaml b/benchmarks/single_node/srt-slurm-recipes/dsv4flash/sglang/b300-fp4-mtp/8k1k.yaml
new file mode 100644
index 0000000000..ed7f590936
--- /dev/null
+++ b/benchmarks/single_node/srt-slurm-recipes/dsv4flash/sglang/b300-fp4-mtp/8k1k.yaml
@@ -0,0 +1,69 @@
+base:
+  schema: 2
+  name: dsv4flash-fp4-b300-sglang-mtp-8k1k
+  model:
+    path: hf:deepseek-ai/DeepSeek-V4-Flash
+    container: lmsysorg/sglang:nightly-dev-cu13-20260925-8ca82118@sha256:baea7ec5ea86412ce59837f17011028b940f9777fa15129254de02bd6a842559
+    precision: fp4
+  resources:
+    gpu_type: b300
+    gpus_per_node: 8
+  frontend:
+    type: sglang
+    enable_multiple_frontends: false
+  observability:
+    enabled: false
+    tachometer:
+      enabled: false
+  engine: sglang
+  roles:
+    agg:
+      nodes: 1
+      workers: 1
+      gpus: 2
+      args:
+        served-model-name: deepseek-ai/DeepSeek-V4-Flash
+        trust-remote-code: true
+        tensor-parallel-size: 2
+        data-parallel-size: 1
+        expert-parallel-size: 1
+        moe-runner-backend: flashinfer_mxfp4
+        disable-flashinfer-autotune: true
+        disable-radix-cache: true
+        mem-fraction-static: 0.85
+        swa-full-tokens-ratio: 0.1
+        chunked-prefill-size: 8192
+        context-length: 9236
+        reasoning-parser: deepseek-v4
+        tool-call-parser: deepseekv4
+        speculative-algorithm: EAGLE
+        speculative-num-steps: 2
+        speculative-eagle-topk: 1
+        speculative-num-draft-tokens: 3
+        # Eager decode and speculative verify/draft; no CUDA graph capture.
+        cuda-graph-backend-decode: disabled
+        cuda-graph-backend-prefill: disabled
+        watchdog-timeout: 3600
+        enable-metrics: true
+      env:
+        PYTHONNOUSERSITE: '1'
+        PYTHONUNBUFFERED: '1'
+        SGLANG_NVFP4_CKPT_FP8_NEXTN_MOE: '0'
+  benchmark:
+    type: custom
+    command: bash /infmax-workspace/benchmarks/single_node/srt_fixed_sequence.sh --dsv4
+    env:
+      MODEL: deepseek-ai/DeepSeek-V4-Flash
+      ISL: '8192'
+      OSL: '1024'
+      RANDOM_RANGE_RATIO: '0.8'
+      USE_CHAT_TEMPLATE: 'true'
+
+zip_override_tp2:
+  roles:
+    agg:
+      args:
+        max-running-requests: [1, 2, 4, 8, 16, 32, 64, 128]
+  benchmark:
+    env:
+      CONC: ['1', '2', '4', '8', '16', '32', '64', '128']
diff --git a/benchmarks/single_node/srt_fixed_sequence.sh b/benchmarks/single_node/srt_fixed_sequence.sh
index 0bc79b9ab4..0a4c511444 100644
--- a/benchmarks/single_node/srt_fixed_sequence.sh
+++ b/benchmarks/single_node/srt_fixed_sequence.sh
@@ -20,7 +20,7 @@ SRT_MONITOR_INTERVAL="$GPU_MONITOR_INTERVAL"
 CLIENT_ARGS=()
 for argument in "$@"; do
     case "$argument" in
-        --trust-remote-code) CLIENT_ARGS+=("$argument") ;;
+        --trust-remote-code|--dsv4) CLIENT_ARGS+=("$argument") ;;
         *) echo "ERROR: unsupported fixed-sequence argument: $argument" >&2; exit 1 ;;
     esac
 done
diff --git a/configs/nvidia-master.yaml b/configs/nvidia-master.yaml
index b0fc9ef451..6dc1079d88 100644
--- a/configs/nvidia-master.yaml
+++ b/configs/nvidia-master.yaml
@@ -8928,3 +8928,18 @@ dsv41flash-fp4-gb300-sglang-agentic-dspark:
       search-space:
       - { tp: 2, ep: 2, kv-offloading: none, spec-decoding: mtp, conc-list: [1, 2, 4, 8, 16, 32, 64, 128], srt-recipe: benchmarks/single_node/srt-slurm-recipes/dsv41flash/sglang/gb300-fp4-mtp/agentic.yaml }
       - { tp: 4, ep: 4, kv-offloading: none, spec-decoding: mtp, conc-list: [1, 2, 4, 8, 16, 32, 64, 128], srt-recipe: benchmarks/single_node/srt-slurm-recipes/dsv41flash/sglang/gb300-fp4-mtp/agentic.yaml }
+
+dsv4flash-fp4-b300-sglang-mtp:
+  image: lmsysorg/sglang:nightly-dev-cu13-20260925-8ca82118@sha256:baea7ec5ea86412ce59837f17011028b940f9777fa15129254de02bd6a842559
+  model: deepseek-ai/DeepSeek-V4-Flash
+  model-prefix: dsv4flash
+  runner: cluster:b300-dsxe
+  precision: fp4
+  framework: sglang
+  multinode: false
+  scenarios:
+    fixed-seq-len:
+    - isl: 8192
+      osl: 1024
+      search-space:
+      - { tp: 2, ep: 1, spec-decoding: mtp, conc-list: [1, 2, 4, 8, 16, 32, 64, 128], srt-recipe: benchmarks/single_node/srt-slurm-recipes/dsv4flash/sglang/b300-fp4-mtp/8k1k.yaml }
diff --git a/docs/configuration-procedures.md b/docs/configuration-procedures.md
index d480a4bfd7..cae948c781 100644
--- a/docs/configuration-procedures.md
+++ b/docs/configuration-procedures.md
@@ -44,6 +44,9 @@ router image does not require changing the worker image. TRT-LLM recipes use nat
 `engine.served_model_name`, without duplicating that flag in `roles.agg.extra_args`.
 The former fork's direct ATOM frontend is not required.
 
+DeepSeek-V4 fixed-sequence recipes pass `--dsv4` to `srt_fixed_sequence.sh` and set
+`USE_CHAT_TEMPLATE: 'true'` to use the shared DeepSeek-V4 encoder rather than a missing HF chat template.
+
 ### Cluster profiles
 
 Launchers that use srt-slurm keep their cluster configuration in
diff --git a/docs/configuration-procedures_zh.md b/docs/configuration-procedures_zh.md
index 47812b4a67..32408f27fd 100644
--- a/docs/configuration-procedures_zh.md
+++ b/docs/configuration-procedures_zh.md
@@ -42,6 +42,9 @@ frontend、一个聚合 worker，并设置 `enable_multiple_frontends: false`。
 镜像。TRT-LLM 配方使用原生 `engine.served_model_name`，不再通过 `roles.agg.extra_args`
 重复传入该参数。不再依赖此前分叉中的 ATOM 直连 frontend。
 
+DeepSeek-V4 固定序列长度配方向 `srt_fixed_sequence.sh` 传入 `--dsv4`，并设置
+`USE_CHAT_TEMPLATE: 'true'`，使用共享 DeepSeek-V4 编码器，而不是 checkpoint 中缺失的 HF chat template。
+
 ## 规程索引
 
 1. [准备 worktree](#准备-worktree)
diff --git a/infx/tests/srt_slurm/test_dsv4_fixed_sequence_client.py b/infx/tests/srt_slurm/test_dsv4_fixed_sequence_client.py
new file mode 100644
index 0000000000..bacb33261e
--- /dev/null
+++ b/infx/tests/srt_slurm/test_dsv4_fixed_sequence_client.py
@@ -0,0 +1,79 @@
+"""Exercise the fixed-sequence client's DeepSeek-V4 encoder forwarding."""
+
+import os
+import subprocess
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[3]
+
+
+def test_dsv4_client_forwards_encoder_and_workload(tmp_path: Path) -> None:
+    harness = tmp_path / "harness.sh"
+    harness.write_text(
+        """
+source() {
+    if [[ "$1" == */benchmark_lib.sh && "$2" != --validation-only ]]; then
+        start_gpu_monitor() { :; }
+        stop_gpu_monitor() { :; }
+        run_benchmark_serving() { printf '%s\\n' "$@" > "$CAPTURE"; }
+    else
+        builtin source "$@"
+    fi
+}
+pip3() { :; }
+"""
+    )
+    capture = tmp_path / "arguments"
+    result = subprocess.run(
+        ["bash", str(ROOT / "benchmarks/single_node/srt_fixed_sequence.sh"), "--dsv4"],
+        env={
+            **os.environ,
+            "BASH_ENV": str(harness),
+            "CAPTURE": str(capture),
+            "INFERENCEX_REPO_ROOT": str(ROOT),
+            "MODEL": "test/model",
+            "FRAMEWORK": "sglang",
+            "CONC": "2",
+            "ISL": "256",
+            "OSL": "64",
+            "RANDOM_RANGE_RATIO": "0.8",
+            "RESULT_FILENAME": "point",
+            "RESULT_DIR": str(tmp_path),
+            "SRT_FRONTEND_HOST": "127.0.0.1",
+            "SRT_FRONTEND_PORT": "8000",
+            "RUN_EVAL": "false",
+            "EVAL_ONLY": "false",
+            "GPU_MONITOR_INTERVAL": "3",
+            "USE_CHAT_TEMPLATE": "true",
+        },
+        capture_output=True,
+        text=True,
+        check=False,
+    )
+    assert result.returncode == 0, result.stdout + result.stderr
+    assert capture.read_text().splitlines() == [
+        "--model",
+        "test/model",
+        "--port",
+        "8000",
+        "--base-url",
+        "http://127.0.0.1:8000",
+        "--backend",
+        "vllm",
+        "--input-len",
+        "256",
+        "--output-len",
+        "64",
+        "--random-range-ratio",
+        "0.8",
+        "--num-prompts",
+        "20",
+        "--max-concurrency",
+        "2",
+        "--result-filename",
+        "point",
+        "--result-dir",
+        str(tmp_path),
+        "--dsv4",
+        "--use-chat-template",
+    ]
diff --git a/perf-changelog.yaml b/perf-changelog.yaml
index 352c61fc0d..2f6218f838 100644
--- a/perf-changelog.yaml
+++ b/perf-changelog.yaml
@@ -8986,3 +8986,12 @@
     - "Hopper 使用 FA3，Blackwell FA4 fp8 descale 问题不适用，EAGLE3 draft 保持 attention_backend FLASH_ATTN。"
     - "This change does not alter the EAGLE3 draft model data type. The draft loads unmodified from the published Inferact/MiniMax-M3-EAGLE3-GQA checkpoint via --speculative-config (method=eagle3). kv-cache-dtype fp8 sets KV-cache storage precision, not the draft weights, and no flag overrides or re-quantizes the draft weights."
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/3503
+
+- config-keys:
+    - dsv4flash-fp4-b300-sglang-mtp
+  scenario-type:
+    - fixed-seq-len
+  description:
+    - "Add DeepSeek-V4-Flash B300 TP2 SGLang 8k1k serving at concurrency 1, 2, 4, 8, 16, 32, 64, 128 with bundled MTP via EAGLE (2 steps, top-k 1, 3 draft tokens) with CUDA/HIP graphs disabled for decode, prefill, and speculative verify/draft, real verification, GPU-resident weights/KV, and the DeepSeek-V4 chat encoder. Weights load from the node-local /scratch/models copy; mmap page faults on the shared /data copy read at ~10 MB/s and outlast the 1800 s health timeout."
+    - "新增 DeepSeek-V4-Flash B300 TP2 SGLang 8k1k serving，并发为 1、2、4、8、16、32、64、128；通过 EAGLE 使用原生 MTP（2 steps、top-k 1、3 draft tokens），decode、prefill 及投机验证/draft 均关闭 CUDA/HIP graph，采用真实验证、GPU 常驻权重/KV 和 DeepSeek-V4 chat 编码器。权重从节点本地 /scratch/models 副本加载；共享 /data 副本的 mmap 缺页读取仅约 10 MB/s，会超过 1800 s 健康检查超时。"
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/3516
diff --git a/runners/launch_b300-dsxe.sh b/runners/launch_b300-dsxe.sh
index efd0506131..6769a3c1aa 100755
--- a/runners/launch_b300-dsxe.sh
+++ b/runners/launch_b300-dsxe.sh
@@ -61,6 +61,7 @@ WRITABLE_MODELS_DIR="/data/home/sa-gha-runner/models"
 STAGED_MODELS=(
     DeepSeek-R1-0528
     DeepSeek-R1-0528-NVFP4-v2
+    DeepSeek-V4-Flash
     DeepSeek-V4-Pro
     DeepSeek-V4-Pro-0813
     DeepSeek-V4-Pro-NVFP4