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1. Model Introduction

Llama 4 is Meta’s latest generation of open-source LLM model with industry-leading performance. SGLang has supported Llama 4 Scout (109B) and Llama 4 Maverick (400B) since v0.4.5. Ongoing optimizations are tracked in the Roadmap. This generation delivers comprehensive upgrades across the board: The highly capable Llama 4 Maverick with 17B active parameters out of ~400B total, with 128 experts. The efficient Llama 4 Scout also has 17B active parameters out of ~109B total, using just 16 experts. Both models leverage early fusion for native multimodality, enabling them to process text and image inputs. Maverick and Scout are both trained on up to 40 trillion tokens on data encompassing 200 languages (with specific fine-tuning support for 12 languages including Arabic, Spanish, German, and Hindi). For more details, please refer to the official llama4 Repository:https://www.llama.com/models/llama-4/

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2. SGLang Installation

SGLang offers multiple installation methods. You can choose the most suitable installation method based on your hardware platform and requirements. Please refer to the official SGLang installation guide for installation instructions.

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3. Model Deployment

This section provides a progressive guide from quick deployment to performance optimization, suitable for users at different levels.

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3.1 Basic Configuration

Interactive Command Generator: Use the configuration selector below to automatically generate the appropriate deployment command for your hardware platform, model variant, deployment strategy, and thinking capabilities.

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3.2 Configuration Tips

  • OOM Mitigation: Reduce --context-length to avoid GPU out-of-memory. Recommended: Scout up to 1M on 8×H100, up to 2.5M on 8×H200; Maverick doesn’t need context-length set on 8×H200. With hybrid KV cache enabled, Scout can reach 5M on 8×H100 and 10M on 8×H200.
  • Attention Backend Auto-Selection: SGLang automatically picks the optimal backend. Manual override with --attention-backend:
    • Blackwell (B200/GB200): trtllm_mha
    • Hopper (H100/H200): fa3
    • AMD GPUs: aiter
    • Intel XPU: intel_xpu
    • Other: triton
  • Chat Template: Add --chat-template llama-4 for chat completion tasks.
  • Multi-Modal: Add --enable-multimodal to enable image input support.
  • Hybrid KV Cache: Set --swa-full-tokens-ratio to control the ratio of SWA (local attention) KV tokens to full-attention KV tokens (default: 0.8, range: 0–1).
  • EAGLE Speculative Decoding: Supported for Llama 4 Scout and Maverick via EAGLE3. Enable with the interactive command generator above.

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4. Model Invocation

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4.1 Basic Usage

For basic API usage and request examples, please refer to:

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4.2 Advanced Usage

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4.2.1 Launch the docker

Command
docker pull lmsysorg/sglang:v0.5.9-rocm720-mi30x
Command
docker run -d -it --ipc=host --network=host --privileged \
  --cap-add=CAP_SYS_ADMIN \
  --device=/dev/kfd --device=/dev/dri --device=/dev/mem \
  --group-add video --cap-add=SYS_PTRACE \
  --security-opt seccomp=unconfined \
  -v /:/work \
  -e SHELL=/bin/bash \
  --name Llama4 \
  lmsysorg/sglang:v0.5.9-rocm720-mi30x \
  /bin/bash

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4.2.2 Launch the server

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Llama-4-Scout

8-GPU deployment command:
Command
sglang serve \
  --model-path meta-llama/Llama-4-Scout-17B-16E-Instruct \
  --tp 8 \
  --context-length 1000000 \
  --trust-remote-code

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Llama-4-Maverick

8-GPU deployment command:
Command
sglang serve \
  --model-path meta-llama/Llama-4-Maverick-17B-128E-Instruct \
  --tp 8 \
  --trust-remote-code

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4.2.3 EAGLE Speculative Decoding

SGLang supports Llama 4 Maverick (400B) with EAGLE speculative decoding. Enable with the EAGLE3 algorithm and the SGLang EAGLE3 draft model:
Command
python3 -m sglang.launch_server \
  --model-path meta-llama/Llama-4-Maverick-17B-128E-Instruct \
  --speculative-algorithm EAGLE3 \
  --speculative-draft-model-path lmsys/sglang-EAGLE3-Llama-4-Maverick-17B-128E-Instruct-v1 \
  --speculative-num-steps 3 \
  --speculative-eagle-topk 1 \
  --speculative-num-draft-tokens 4 \
  --trust-remote-code \
  --tp 8

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5. Benchmark

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5.1 Speed Benchmark (Scout)

Test Environment: Hardware: AMD MI300x GPU Model: Llama-4-Scout Tensor Parallelism: 8 sglang version: 0.5.9
  • Model Deployment
Command
sglang serve \
  --model-path meta-llama/Llama-4-Scout-17B-16E-Instruct \
  --tp 8 \
  --context-length 1000000 \
  --trust-remote-code

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5.1.1 Low Concurrency (Latency-Optimized)

  • Benchmark Command:
Command
python3 -m sglang.bench_serving \
  --backend sglang \
  --model meta-llama/Llama-4-Scout-17B-16E-Instruct \
  --dataset-name random \
  --random-input-len 1000 \
  --random-output-len 1000 \
  --num-prompts 10 \
  --max-concurrency 1 \
  --request-rate inf
  • Test Results:
Output
============ Serving Benchmark Result ============
Backend:                                 sglang
Traffic request rate:                    inf
Max request concurrency:                 1
Successful requests:                     10
Benchmark duration (s):                  74.62
Total input tokens:                      6101
Total input text tokens:                 6101
Total input vision tokens:               0
Total generated tokens:                  4220
Total generated tokens (retokenized):    4211
Request throughput (req/s):              0.14
Input token throughput (tok/s):          82.88
Output token throughput (tok/s):         57.42
Peak output token throughput (tok/s):    146.00
Peak concurrent requests:                2
Total token throughput (tok/s):          140.20
Concurrency:                             1.00
----------------End-to-End Latency----------------
Mean E2E Latency (ms):                   7459.48
Median E2E Latency (ms):                 4489.77
---------------Time to First Token----------------
Mean TTFT (ms):                          4246.98
Median TTFT (ms):                        68.57
P99 TTFT (ms):                           48091.05
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          7.49
Median TPOT (ms):                        7.40
P99 TPOT (ms):                           7.40
---------------Inter-Token Latency----------------
Mean ITL (ms):                           7.49
Median ITL (ms):                         7.49
P95 ITL (ms):                            7.47
P99 ITL (ms):                            7.52
Max ITL (ms):                            10.44
==================================================

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5.1.2 Medium Concurrency (Balanced)

  • Benchmark Command:
Command
python3 -m sglang.bench_serving \
  --backend sglang \
  --model meta-llama/Llama-4-Scout-17B-16E-Instruct \
  --dataset-name random \
  --random-input-len 1000 \
  --random-output-len 1000 \
  --num-prompts 80 \
  --max-concurrency 16 \
  --request-rate inf
  • Test Results:
Output
============ Serving Benchmark Result ============
Backend:                                 sglang
Traffic request rate:                    inf
Max request concurrency:                 16
Successful requests:                     80
Benchmark duration (s):                  45.41
Total input tokens:                      49668
Total input text tokens:                 49668
Total input vision tokens:               0
Total generated tokens:                  40805
Total generated tokens (retokenized):    40516
Request throughput (req/s):              2.26
Input token throughput (tok/s):          1120.46
Output token throughput (tok/s):         1152.47
Peak output token throughput (tok/s):    1520.00
Peak concurrent requests:                21
Total token throughput (tok/s):          2272.84
Concurrency:                             14.76
----------------End-to-End Latency----------------
Mean E2E Latency (ms):                   6089.22
Median E2E Latency (ms):                 6568.80
---------------Time to First Token----------------
Mean TTFT (ms):                          124.44
Median TTFT (ms):                        87.42
P99 TTFT (ms):                           268.72
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          11.88
Median TPOT (ms):                        12.00
P99 TPOT (ms):                           15.49
---------------Inter-Token Latency----------------
Mean ITL (ms):                           11.72
Median ITL (ms):                         10.54
P95 ITL (ms):                            11.22
P99 ITL (ms):                            67.88
Max ITL (ms):                            74.05
==================================================

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5.1.3 High Concurrency (Throughput-Optimized)

  • Benchmark Command:
Command
python3 -m sglang.bench_serving \
  --backend sglang \
  --model meta-llama/Llama-4-Scout-17B-16E-Instruct \
  --dataset-name random \
  --random-input-len 1000 \
  --random-output-len 1000 \
  --num-prompts 500 \
  --max-concurrency 100 \
  --request-rate inf
  • Test Results:
Output
============ Serving Benchmark Result ============
Backend:                                 sglang
Traffic request rate:                    inf
Max request concurrency:                 100
Successful requests:                     500
Benchmark duration (s):                  85.84
Total input tokens:                      249841
Total input text tokens:                 249841
Total input vision tokens:               0
Total generated tokens:                  252662
Total generated tokens (retokenized):    250498
Request throughput (req/s):              5.84
Input token throughput (tok/s):          2910.84
Output token throughput (tok/s):         2944.82
Peak output token throughput (tok/s):    4100.00
Peak concurrent requests:                110
Total token throughput (tok/s):          5854.65
Concurrency:                             92.24
----------------End-to-End Latency----------------
Mean E2E Latency (ms):                   15844.00
Median E2E Latency (ms):                 15262.56
---------------Time to First Token----------------
Mean TTFT (ms):                          204.46
Median TTFT (ms):                        129.96
P99 TTFT (ms):                           528.54
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          41.56
Median TPOT (ms):                        42.90
P99 TPOT (ms):                           47.48
---------------Inter-Token Latency----------------
Mean ITL (ms):                           40.99
Median ITL (ms):                         24.46
P95 ITL (ms):                            84.46
P99 ITL (ms):                            87.64
Max ITL (ms):                            226.06
==================================================

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5.2 Speed Benchmark (Maverick)

Test Environment: Hardware: AMD MI300x GPU Model: Llama-4-Maverick Tensor Parallelism: 8 sglang version: 0.5.9
  • Model Deployment
Command
sglang serve \
  --model-path meta-llama/Llama-4-Maverick-17B-128E-Instruct \
  --tp 8 \
  --context-length 1000000 \
  --trust-remote-code

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5.2.1 Low Concurrency (Latency-Optimized)

  • Benchmark Command:
Command
python3 -m sglang.bench_serving \
  --backend sglang \
  --model meta-llama/Llama-4-Maverick-17B-128E-Instruct \
  --dataset-name random \
  --random-input-len 1000 \
  --random-output-len 1000 \
  --num-prompts 10 \
  --max-concurrency 1 \
  --request-rate inf
  • Test Results:
Output
============ Serving Benchmark Result ============
Backend:                                 sglang
Traffic request rate:                    inf
Max request concurrency:                 1
Successful requests:                     10
Benchmark duration (s):                  68.08
Total input tokens:                      6101
Total input text tokens:                 6101
Total input vision tokens:               0
Total generated tokens:                  4220
Total generated tokens (retokenized):    4202
Request throughput (req/s):              0.15
Input token throughput (tok/s):          89.62
Output token throughput (tok/s):         61.99
Peak output token throughput (tok/s):    168.00
Peak concurrent requests:                2
Total token throughput (tok/s):          151.61
Concurrency:                             1.00
----------------End-to-End Latency----------------
Mean E2E Latency (ms):                   6805.62
Median E2E Latency (ms):                 2733.91
---------------Time to First Token----------------
Mean TTFT (ms):                          4296.56
Median TTFT (ms):                        57.45
P99 TTFT (ms):                           38633.95
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          5.95
Median TPOT (ms):                        5.96
P99 TPOT (ms):                           5.97
---------------Inter-Token Latency----------------
Mean ITL (ms):                           5.96
Median ITL (ms):                         5.96
P95 ITL (ms):                            6.02
P99 ITL (ms):                            6.08
Max ITL (ms):                            7.02
==================================================

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5.2.2 Medium Concurrency (Balanced)

  • Benchmark Command:
Command
python3 -m sglang.bench_serving \
  --backend sglang \
  --model meta-llama/Llama-4-Maverick-17B-128E-Instruct \
  --dataset-name random \
  --random-input-len 1000 \
  --random-output-len 1000 \
  --num-prompts 80 \
  --max-concurrency 16 \
  --request-rate inf
  • Test Results:
Output
============ Serving Benchmark Result ============
Backend:                                 sglang
Traffic request rate:                    inf
Max request concurrency:                 16
Successful requests:                     80
Benchmark duration (s):                  30.72
Total input tokens:                      39668
Total input text tokens:                 39668
Total input vision tokens:               0
Total generated tokens:                  40805
Total generated tokens (retokenized):    40923
Request throughput (req/s):              2.60
Input token throughput (tok/s):          1291.39
Output token throughput (tok/s):         1328.41
Peak output token throughput (tok/s):    1760.00
Peak concurrent requests:                22
Total token throughput (tok/s):          2619.80
Concurrency:                             13.92
----------------End-to-End Latency----------------
Mean E2E Latency (ms):                   5345.15
Median E2E Latency (ms):                 5679.73
---------------Time to First Token----------------
Mean TTFT (ms):                          259.30
Median TTFT (ms):                        72.60
P99 TTFT (ms):                           1063.45
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          10.53
Median TPOT (ms):                        10.22
P99 TPOT (ms):                           20.27
---------------Inter-Token Latency----------------
Mean ITL (ms):                           9.99
Median ITL (ms):                         9.10
P95 ITL (ms):                            9.87
P99 ITL (ms):                            55.62
Max ITL (ms):                            868.54
==================================================

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5.2.3 High Concurrency (Throughput-Optimized)

  • Benchmark Command:
Command
python3 -m sglang.bench_serving \
  --backend sglang \
  --model meta-llama/Llama-4-Maverick-17B-128E-Instruct \
  --dataset-name random \
  --random-input-len 1000 \
  --random-output-len 1000 \
  --num-prompts 500 \
  --max-concurrency 100 \
  --request-rate inf
  • Test Results:
Output
============ Serving Benchmark Result ============
Backend:                                 sglang
Traffic request rate:                    inf
Max request concurrency:                 100
Successful requests:                     500
Benchmark duration (s):                  90.95
Total input tokens:                      249831
Total input text tokens:                 249831
Total input vision tokens:               0
Total generated tokens:                  252662
Total generated tokens (retokenized):    251625
Request throughput (req/s):              5.50
Input token throughput (tok/s):          2746.77
Output token throughput (tok/s):         2777.90
Peak output token throughput (tok/s):    3700.00
Peak concurrent requests:                109
Total token throughput (tok/s):          5524.67
Concurrency:                             93.04
----------------End-to-End Latency----------------
Mean E2E Latency (ms):                   16924.17
Median E2E Latency (ms):                 16294.85
---------------Time to First Token----------------
Mean TTFT (ms):                          188.19
Median TTFT (ms):                        128.96
P99 TTFT (ms):                           534.81
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          33.63
Median TPOT (ms):                        35.37
P99 TPOT (ms):                           38.26
---------------Inter-Token Latency----------------
Mean ITL (ms):                           33.19
Median ITL (ms):                         27.66
P95 ITL (ms):                            76.91
P99 ITL (ms):                            78.82
Max ITL (ms):                            268.17
==================================================

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5.3 Accuracy Benchmark

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5.3.1 GSM8K Benchmark

  • Benchmark Command:
Command
python3 -m sglang.test.few_shot_gsm8k --num-questions 200
  • Llama-4-Scout-17B-16E-Instruct
Output
Accuracy: 0.945
Invalid: 0.000
Latency: 12.731 s
Output throughput: 1595.418 token/s
  • Llama-4-Maverick-17B-128E-Instruct
Output
Accuracy: 0.895
Invalid: 0.000
Latency: 9.739 s
Output throughput: 2405.505 token/s

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5.3.2 MMLU Pro with lm-eval

Accuracy on MMLU Pro matches Meta’s official benchmark numbers on 8×H100 (reproduction details: PR #5092):
ModelOfficialSGLang
Llama-4-Scout-17B-16E-Instruct74.375.2
Llama-4-Maverick-17B-128E-Instruct80.580.7
Scout:
Command
# Start the server
python -m sglang.launch_server \
  --model-path meta-llama/Llama-4-Scout-17B-16E-Instruct \
  --port 30000 \
  --tp 8 \
  --mem-fraction-static 0.8 \
  --context-length 65536

# Run lm_eval
lm_eval --model local-chat-completions \
  --model_args model=meta-llama/Llama-4-Scout-17B-16E-Instruct,base_url=http://localhost:30000/v1/chat/completions,num_concurrent=128,timeout=999999,max_gen_toks=2048 \
  --tasks mmlu_pro \
  --batch_size 128 \
  --apply_chat_template \
  --num_fewshot 0
Maverick:
Command
# Start the server
python -m sglang.launch_server \
  --model-path meta-llama/Llama-4-Maverick-17B-128E-Instruct \
  --port 30000 \
  --tp 8 \
  --mem-fraction-static 0.8 \
  --context-length 65536

# Run lm_eval
lm_eval --model local-chat-completions \
  --model_args model=meta-llama/Llama-4-Maverick-17B-128E-Instruct,base_url=http://localhost:30000/v1/chat/completions,num_concurrent=128,timeout=999999,max_gen_toks=2048 \
  --tasks mmlu_pro \
  --batch_size 128 \
  --apply_chat_template \
  --num_fewshot 0