diff --git a/benchmarks/single_node/agentic/qwen3.8next_fp8_mi355x_sglang_mtp.sh b/benchmarks/single_node/agentic/qwen3.8next_fp8_mi355x_sglang_mtp.sh
new file mode 100755
index 0000000000..c3130cf2e5
--- /dev/null
+++ b/benchmarks/single_node/agentic/qwen3.8next_fp8_mi355x_sglang_mtp.sh
@@ -0,0 +1,211 @@
+#!/usr/bin/env bash
+set -euo pipefail
+set -x
+
+# Agentic trace replay benchmark for Qwen3.8-Flash-Next FP8 on MI355X using
+# SGLang with MTP speculative decoding. Day-zero recipe for the hybrid
+# GDN + QSA architecture on CDNA4 (gfx950).
+#
+# MI355X is ROCm, so this arm is FP8 (Qwen/Qwen3.8-Flash-Next-FP8).
+# NVFP4 is not available on AMD GPUs. Attention backend is aiter (ROCm).
+#
+# Image: lmsysorg/sglang-rocm:v0.5.19-rocm700-mi35x-20260909 includes
+# SGLang PR #37500 (merged 2026-09-08), which adds full Qwen3.8-Flash-Next
+# model support — no runtime patches needed.
+#
+# The SGLang cookbook (docs.sglang.io) verified flags for MI355X are:
+#   --tp-size 8 --attention-backend aiter --page-size 32 --kv-cache-dtype auto
+#   --chunked-prefill-size 16384 --watchdog-timeout 1200 --mem-fraction-static 0.9
+#
+# Decode CUDA graphs are disabled due to a tilelang MFMA warp partition bug
+# (N must be divisible by 16, but got 8) in the v0.5.19-rocm700-mi35x-20260909
+# image. This will be re-enabled once the upstream fix lands.
+#
+# Speculative decoding uses NEXTN (the Qwen3.8 Flash Next native MTP head),
+# 3 steps, eagle-topk 1, 4 draft tokens — mirroring the H200 agentic recipe.
+#
+# Required env vars:
+#   MODEL, TP, CONC, EP_SIZE, KV_OFFLOADING,
+#   TOTAL_CPU_DRAM_GB, RESULT_DIR, DURATION
+
+source "$(dirname "$0")/../../benchmark_lib.sh"
+
+export EVAL_FRAMEWORK="lm-eval"
+
+check_env_vars \
+    MODEL TP CONC EP_SIZE KV_OFFLOADING \
+    TOTAL_CPU_DRAM_GB RESULT_DIR DURATION
+
+SCHEDULER_RECV_INTERVAL=${SCHEDULER_RECV_INTERVAL:-30}
+
+if [[ -n "${SLURM_JOB_ID:-}" ]]; then
+    echo "JOB $SLURM_JOB_ID running on ${SLURMD_NODENAME:-unknown}"
+fi
+
+if [[ -n "${MODEL_PATH:-}" ]]; then
+    if [[ ! -d "$MODEL_PATH" || -z "$(ls -A "$MODEL_PATH" 2>/dev/null)" ]]; then
+        hf download "$MODEL" --local-dir "$MODEL_PATH"
+    fi
+else
+    hf download "$MODEL"
+    export MODEL_PATH="$MODEL"
+fi
+
+rocm-smi || true
+amd-smi || true
+
+export WEKA_LOADER_OVERRIDE=semianalysis_cc_traces_weka_with_subagents_256k
+resolve_trace_source
+install_agentic_deps
+
+export AIPERF_SERVER_METRICS_URLS="http://localhost:${PORT}/metrics"
+export AIPERF_REQUIRED_SERVER_METRIC_PREFIX="sglang:"
+
+SERVER_LOG="$RESULT_DIR/server.log"
+mkdir -p "$RESULT_DIR"
+
+SERVER_PID=""
+cleanup_agentic_services() {
+    local exit_code=$?
+    trap - EXIT INT TERM
+    set +e
+    stop_background_process_tree "$SERVER_PID" "SGLang server" 60
+    exit "$exit_code"
+}
+trap cleanup_agentic_services EXIT
+trap 'exit 130' INT
+trap 'exit 143' TERM
+
+# ---- HiCache (host-DRAM KV offload) ----------------------------------------
+CACHE_ARGS=()
+if require_agentic_kv_offload_backend hicache; then
+    REQUESTED_HICACHE_TOTAL_GB="${HICACHE_TOTAL_CPU_DRAM_GB:-$TOTAL_CPU_DRAM_GB}"
+    if [ "$REQUESTED_HICACHE_TOTAL_GB" -gt "$TOTAL_CPU_DRAM_GB" ]; then
+        echo "Error: requested HiCache pool ${REQUESTED_HICACHE_TOTAL_GB} GB exceeds configured capacity ${TOTAL_CPU_DRAM_GB} GB" >&2
+        exit 1
+    fi
+    TOTAL_CPU_DRAM_GB="$REQUESTED_HICACHE_TOTAL_GB"
+    HICACHE_HOST_POOL_COUNT="${HICACHE_HOST_POOL_COUNT:-2}"
+    HICACHE_WRITE_POLICY="${HICACHE_WRITE_POLICY:-write_through_selective}"
+    MAX_HICACHE_SIZE_GB=$((TOTAL_CPU_DRAM_GB / TP / HICACHE_HOST_POOL_COUNT))
+    HICACHE_SIZE_GB="${HICACHE_SIZE_GB:-$MAX_HICACHE_SIZE_GB}"
+    if [ "$HICACHE_SIZE_GB" -gt "$MAX_HICACHE_SIZE_GB" ]; then
+        echo "Error: HICACHE_SIZE_GB=$HICACHE_SIZE_GB exceeds configured per-pool limit $MAX_HICACHE_SIZE_GB" >&2
+        exit 1
+    fi
+    if [ "$HICACHE_SIZE_GB" -lt 1 ]; then
+        echo "Error: computed HICACHE_SIZE_GB=$HICACHE_SIZE_GB from TOTAL_CPU_DRAM_GB=$TOTAL_CPU_DRAM_GB, TP=$TP, HICACHE_HOST_POOL_COUNT=$HICACHE_HOST_POOL_COUNT" >&2
+        exit 1
+    fi
+    echo "HiCache CPU pool: ${HICACHE_SIZE_GB} GB per rank per host pool across TP=${TP}, host_pool_count=${HICACHE_HOST_POOL_COUNT}"
+    CACHE_ARGS=(
+        --enable-hierarchical-cache
+        --hicache-size "$HICACHE_SIZE_GB"
+        --hicache-io-backend kernel
+        --hicache-mem-layout page_first
+        --hicache-write-policy "$HICACHE_WRITE_POLICY"
+    )
+fi
+
+# ---- Parallelism ------------------------------------------------------------
+PARALLEL_ARGS=(
+    --tp-size "$TP"
+    --dp-size 1
+    --ep-size "$EP_SIZE"
+)
+
+TOKENIZER_ARGS=()
+if [ "$TP" -ge 4 ]; then
+    TOKENIZER_ARGS=(--tokenizer-worker-num 6)
+fi
+
+MAX_RUNNING_REQUESTS=$((2 * CONC))
+CUDA_GRAPH_MAX_BS="$CONC"
+[ "$CUDA_GRAPH_MAX_BS" -gt 128 ] && CUDA_GRAPH_MAX_BS=128
+
+# ---- ROCm / aiter environment -----------------------------------------------
+export PYTHONNOUSERSITE=1
+export SGLANG_USE_AITER=1
+export SGLANG_USE_AITER_UNIFIED_ATTN=1
+export AITER_FLYDSL_FORCE=1
+export ROCM_QUICK_REDUCE_QUANTIZATION=INT8
+export SGLANG_TIMEOUT_KEEP_ALIVE=1800
+export SGLANG_ENABLE_SPEC_V2=1
+
+# ---- Speculative decoding (NEXTN / MTP) -------------------------------------
+SPEC_ARGS=(
+    --speculative-algorithm NEXTN
+    --speculative-num-steps 3
+    --speculative-eagle-topk 1
+    --speculative-num-draft-tokens 4
+)
+
+# golden_al_distribution/qwen3.8next_mtp.yaml:
+# qwen3.8-flash-next-fp8.thinking_on[3] = 2.32.
+# AgentX replays run with thinking on, so the thinking_on row is the right one.
+if [ "${EVAL_ONLY:-false}" != "true" ]; then
+    export SGLANG_SIMULATE_ACC_LEN=2.32
+    export SGLANG_SIMULATE_ACC_METHOD=match-expected
+    export SGLANG_SIMULATE_ACC_TOKEN_MODE=real-draft-token
+fi
+
+# ---- multi_tokenizer cached_tokens_details patch ----------------------------
+SGLANG_MULTI_TOKENIZER=/sgl-workspace/sglang/python/sglang/srt/managers/multi_tokenizer_mixin.py
+if [ -f "$SGLANG_MULTI_TOKENIZER" ]; then
+    if ! sed -n '/elif isinstance(output, BatchStrOutput):/,/input_token_logprobs_val=_extract_field_by_index/p' "$SGLANG_MULTI_TOKENIZER" \
+        | grep -q 'cached_tokens_details=_extract_field_by_index'; then
+        sed -i '/elif isinstance(output, BatchStrOutput):/,/cached_tokens=_extract_field_by_index(output, "cached_tokens", i),/ {
+            /cached_tokens=_extract_field_by_index(output, "cached_tokens", i),/a\
+                cached_tokens_details=_extract_field_by_index(\
+                    output, "cached_tokens_details", i\
+                ),
+        }' "$SGLANG_MULTI_TOKENIZER"
+    fi
+fi
+
+# ---- Launch server -----------------------------------------------------------
+SGLANG_CMD=(
+    python3 -m sglang.launch_server
+    --model-path "$MODEL_PATH"
+    --served-model-name "$MODEL"
+    --host 0.0.0.0
+    --port "$PORT"
+    --trust-remote-code
+    "${PARALLEL_ARGS[@]}"
+    --attention-backend aiter
+    --page-size 32
+    --kv-cache-dtype auto
+    --mem-fraction-static 0.90
+    --model-loader-extra-config '{"enable_multithread_load": true}'
+    --watchdog-timeout 1200
+    --chunked-prefill-size 16384
+    --mamba-ssm-dtype bfloat16
+    --cuda-graph-backend-decode disabled
+    --cuda-graph-max-bs "$CUDA_GRAPH_MAX_BS"
+    --max-running-requests "$MAX_RUNNING_REQUESTS"
+    --scheduler-recv-interval "$SCHEDULER_RECV_INTERVAL"
+    --stream-interval 50
+    "${TOKENIZER_ARGS[@]}"
+    --tokenizer-path "$MODEL"
+    --reasoning-parser qwen3
+    --tool-call-parser qwen3_coder
+    "${SPEC_ARGS[@]}"
+    --enable-metrics
+    --enable-cache-report
+    "${CACHE_ARGS[@]}"
+)
+
+printf '%q ' "${SGLANG_CMD[@]}" | tee "$RESULT_DIR/sglang_command.txt"
+printf '\n' | tee -a "$RESULT_DIR/sglang_command.txt"
+"${SGLANG_CMD[@]}" > "$SERVER_LOG" 2>&1 &
+SERVER_PID=$!
+
+wait_for_server_ready --port "$PORT" --server-log "$SERVER_LOG" --server-pid "$SERVER_PID"
+
+if [ "${EVAL_ONLY:-false}" = "true" ]; then
+    run_eval --port "$PORT"
+else
+    build_replay_cmd "$RESULT_DIR"
+    REPLAY_CMD+=" --apply-chat-template"
+    run_agentic_replay_and_write_outputs "$RESULT_DIR"
+fi
diff --git a/configs/amd-master.yaml b/configs/amd-master.yaml
index 2510dc3b8d..2d19d217bb 100644
--- a/configs/amd-master.yaml
+++ b/configs/amd-master.yaml
@@ -443,6 +443,20 @@ qwen3.5-fp8-mi300x-sglang-agentic-mtp:
       - { tp: 8, ep: 1, spec-decoding: mtp, kv-offloading: none, conc-list: [4, 16, 20, 24, 32] }
       - { tp: 8, ep: 8, spec-decoding: mtp, kv-offloading: none, conc-list: [4, 16, 20, 24, 32] }
 
+qwen3.8-flash-next-fp8-mi355x-sglang-agentic-mtp:
+  image: lmsysorg/sglang-rocm:v0.5.19-rocm700-mi35x-20260909
+  model: Qwen/Qwen3.8-Flash-Next-FP8
+  model-prefix: qwen3.8-flash-next
+  runner: cluster:mi355x-amds
+  precision: fp8
+  framework: sglang
+  multinode: false
+  scenarios:
+    agentic-coding:
+    - dram-utilization: 0.80
+      search-space:
+      - { tp: 4, ep: 1, spec-decoding: mtp, kv-offloading: none, conc-list: [1, 4, 8, 12, 16, 20, 24, 28, 32] }
+
 dsr1-fp8-mi355x-atom:
   image: rocm/atom:rocm7.2.3_ubuntu24.04_py3.12_pytorch_release_2.10.0_atom20260511
   model: deepseek-ai/DeepSeek-R1-0528
diff --git a/perf-changelog.yaml b/perf-changelog.yaml
index e0ef448195..3455390cf3 100644
--- a/perf-changelog.yaml
+++ b/perf-changelog.yaml
@@ -6947,3 +6947,12 @@
     - "Update vLLM ROCm image from vllm/vllm-openai-rocm:v0.27.1 (v0.27.1 release) to vllm/vllm-openai-rocm:nightly-d9105ea8001e0a6d77a96327d17515bb5791fb36 (2026-09-07 upstream ROCm nightly, digest sha256:74d4a95f3ae672ecddf9acb7296917def82d9eca51687fa2862ae72b03ff1907, tag commit vllm-project/vllm@d9105ea8; Docker Hub last pushed 2026-09-07T05:26:48Z). benchmarks/single_node/agentic/minimaxm3_fp8_mi300x_mtp.sh is unchanged: TRITON_ATTN attention, fp8 KV, block-size 128, EAGLE3 speculative decoding with the Inferact MiniMax-M3 EAGLE3-GQA draft and the committed golden synthetic acceptance length, minimax_m3 tool-call and reasoning parsers; the search space is unchanged. The upstream commit-pinned ROCm nightly is the same vllm commit the B200 MiniMax-M3 AgentX recipe moved to in #2860. Note that vllm-openai-rocm commit-nightly tags have expired from Docker Hub within days in the past; node squash caches keep merged configs running, but a re-pin to a durable tag may be needed later."
     - "Add --compilation-config cudagraph_mode=FULL_DECODE_ONLY to the serve command. The upstream nightly does not torch-compile MiniMaxM3SparseForConditionalGeneration, so with VLLM_USE_BREAKABLE_CUDAGRAPH=0 the default FULL_AND_PIECEWISE mode aborts at engine init with piecewise CUDA graphs unavailable (first sweep, run 34174124043, eval cell); full decode-only graphs are what the MI355X MiniMax-M3 sibling runs on its nightly (#2825)."
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2873
+
+- config-keys:
+    - qwen3.8-flash-next-fp8-mi355x-sglang-agentic-mtp
+  scenario-type:
+    - agentic-coding
+  description:
+    - "Add day-zero Qwen3.8-Flash-Next FP8 agentic benchmark on MI355X with NEXTN MTP speculative decoding. New config block qwen3.8-flash-next-fp8-mi355x-sglang-agentic-mtp using lmsysorg/sglang-rocm:v0.5.19-rocm700-mi35x-20260909 image (includes SGLang PR #37500, merged 2026-09-08, full Qwen3.8-Flash-Next model support) with model Qwen/Qwen3.8-Flash-Next-FP8 (176B total, 6B active, hybrid GDN+QSA architecture). TP=4, EP=1, NEXTN MTP (3 steps, eagle-topk 1, 4 draft tokens), aiter attention backend, page-size 32, kv-cache-dtype auto, mem-fraction-static 0.90, mamba-ssm-dtype bfloat16, golden acceptance length SGLANG_SIMULATE_ACC_LEN=2.32. Concurrency grid [1, 4, 8, 12, 16, 20, 24, 28, 32], no kv-offloading. Matches SGLang cookbook MI355X recipe (docs.sglang.io)."
+    - "Decode CUDA graphs are disabled (--cuda-graph-backend-decode disabled) due to a tilelang MFMA warp partition bug (N must be divisible by 16, but got 8) in the v0.5.19-rocm700-mi35x-20260909 image during decode graph capture. This affects all TP values. Will be re-enabled once the upstream fix lands."
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2924