Apertus-8B-Instruct-2509-FP8-dynamic

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Model Overview

• Model Architecture: ApertusForCausalLM
  • Input: Text
  • Output: Text
• Model Optimizations:
  • Weight quantization: FP8
  • Activation quantization: FP8
• Release Date: 9/18/2025
• Version: 1.0
• Model Developers: Red Hat
• ModelCar Storage URI: oci://registry.redhat.io/rhai/modelcar-apertus-8b-instruct-2509-fp8-dynamic:3.0
• Validated on RHOAI 3.2: quay.io/modh/vllm:rhoai-3.2-cuda
• Validated on RHAIIS 3.2.5: http://registry.redhat.io/rhaiis/vllm-cuda-rhel9:3.2.5-1766067105
• Validated on vLLM: 0.11.2

Quantized version of swiss-ai/Apertus-8B-2509.

Model Optimizations

This model was obtained by quantizing the weights and activations of swiss-ai/Apertus-8B-2509 to FP8 data type. This optimization reduces the number of bits per parameter from 16 to 8, reducing the disk size and GPU memory requirements by approximately 50%. Only the weights and activations of the linear operators within transformers blocks are quantized.

Deployment

Use with vLLM

1. Initialize vLLM server:

vllm serve RedHatAI/Apertus-8B-Instruct-2509-FP8-dynamic

1. Send requests to the server:

from openai import OpenAI

# Modify OpenAI's API key and API base to use vLLM's API server.
openai_api_key = "EMPTY"
openai_api_base = "http://<your-server-host>:8000/v1"

client = OpenAI(
    api_key=openai_api_key,
    base_url=openai_api_base,
)

model = "RedHatAI/Apertus-8B-Instruct-2509-FP8-dynamic"

messages = [
    {"role": "user", "content": "Give me a short introduction to large language model."},
]

outputs = client.chat.completions.create(
    model=model,
    messages=messages,
)

generated_text = outputs.choices[0].message.content
print(generated_text)

<details> <summary>Deploy on <strong>Red Hat AI Inference Server</strong></summary>

podman run --rm -it --device nvidia.com/gpu=all -p 8000:8000 \
 --ipc=host \
--env "HUGGING_FACE_HUB_TOKEN=$HF_TOKEN" \
--env "HF_HUB_OFFLINE=0" -v ~/.cache/vllm:/home/vllm/.cache \
--name=vllm \
registry.access.redhat.com/rhaiis/rh-vllm-cuda \
vllm serve \
--tensor-parallel-size 8 \
--max-model-len 32768  \
--enforce-eager --model RedHatAI/Apertus-8B-Instruct-2509-FP8-dynamic

</details> <details> <summary>Deploy on <strong>Red Hat Openshift AI</strong></summary>

# Setting up vllm server with ServingRuntime
# Save as: vllm-servingruntime.yaml
apiVersion: serving.kserve.io/v1alpha1
kind: ServingRuntime
metadata:
 name: vllm-cuda-runtime # OPTIONAL CHANGE: set a unique name
 annotations:
   openshift.io/display-name: vLLM NVIDIA GPU ServingRuntime for KServe
   opendatahub.io/recommended-accelerators: '["nvidia.com/gpu"]'
 labels:
   opendatahub.io/dashboard: 'true'
spec:
 annotations:
   prometheus.io/port: '8080'
   prometheus.io/path: '/metrics'
 multiModel: false
 supportedModelFormats:
   - autoSelect: true
     name: vLLM
 containers:
   - name: kserve-container
     image: quay.io/modh/vllm:rhoai-3.0-cuda # CHANGE if needed. If AMD: quay.io/modh/vllm:rhoai-3.0-rocm
     command:
       - python
       - -m
       - vllm.entrypoints.openai.api_server
     args:
       - "--port=8080"
       - "--model=/mnt/models"
       - "--served-model-name={{.Name}}"
     env:
       - name: HF_HOME
         value: /tmp/hf_home
     ports:
       - containerPort: 8080
         protocol: TCP

# Attach model to vllm server. This is an NVIDIA template
# Save as: inferenceservice.yaml
apiVersion: serving.kserve.io/v1beta1
kind: InferenceService
metadata:
  annotations:
    openshift.io/display-name: Apertus-8B-Instruct-2509-FP8-dynamic # OPTIONAL CHANGE
    serving.kserve.io/deploymentMode: RawDeployment
  name: Apertus-8B-Instruct-2509-FP8-dynamic        # specify model name. This value will be used to invoke the model in the payload
  labels:
    opendatahub.io/dashboard: 'true'
spec:
  predictor:
    maxReplicas: 1
    minReplicas: 1
    model:
      modelFormat:
        name: vLLM
      name: ''
      resources:
        limits:
          cpu: '2'			# this is model specific
          memory: 8Gi		# this is model specific
          nvidia.com/gpu: '1'	# this is accelerator specific
        requests:			# same comment for this block
          cpu: '1'
          memory: 4Gi
          nvidia.com/gpu: '1'
      runtime: vllm-cuda-runtime	# must match the ServingRuntime name above
      storageUri: oci://registry.redhat.io/rhai/modelcar-apertus-8b-instruct-2509-fp8-dynamic:3.0
    tolerations:
    - effect: NoSchedule
      key: nvidia.com/gpu
      operator: Exists

# make sure first to be in the project where you want to deploy the model
# oc project <project-name>

# apply both resources to run model

# Apply the ServingRuntime
oc apply -f vllm-servingruntime.yaml

# Replace <inference-service-name> and <cluster-ingress-domain> below:
# - Run `oc get inferenceservice` to find your URL if unsure.

# Call the server using curl:
curl https://<inference-service-name>-predictor-default.<domain>/v1/chat/completions
        -H "Content-Type: application/json" \
        -d '{
    "model": "Apertus-8B-Instruct-2509-FP8-dynamic",
    "stream": true,
    "stream_options": {
        "include_usage": true
    },
    "max_tokens": 1,
    "messages": [
        {
            "role": "user",
            "content": "How can a bee fly when its wings are so small?"
        }
    ]
}'

See Red Hat Openshift AI documentation for more details.

</details>

Creation

This model was created with llm-compressor by running the code snippet below.

<details> <summary>Model Creation Code</summary>

from llmcompressor.modifiers.quantization import QuantizationModifier
from llmcompressor.transformers import oneshot
from transformers import AutoModelForCausalLM, AutoTokenizer

# Load model
model_stub = "swiss-ai/Apertus-70B-Instruct-2509"
model_name = model_stub.split("/")[-1]

model = AutoModelForCausalLM.from_pretrained(model_stub, dtype="auto")

tokenizer = AutoTokenizer.from_pretrained(model_stub)

# Configure the quantization algorithm and scheme
recipe = QuantizationModifier(
    ignore=["lm_head"],
    targets="Linear",
    scheme="FP8_dynamic",
)

# Apply quantization
oneshot(
    model=model,
    recipe=recipe,
)

# Save to disk in compressed-tensors format
save_path = model_name + "-FP8-dynamic"
model.save_pretrained(save_path)
tokenizer.save_pretrained(save_path)
print(f"Model and tokenizer saved to: {save_path}")

</details>

Evaluation

The model was evaluated on OpenLLM Leaderboard V1, using the following command:

<details> <summary>Evaluation Commands</summary>

OpenLLM Leaderboard V1:

lm_eval \
  --model vllm \
  --model_args pretrained="RedHatAI/Apertus-8B-Instruct-2509-FP8-dynamic",dtype=auto,add_bos_token=True,max_model_len=4096,tensor_parallel_size=1,gpu_memory_utilization=0.6,enable_chunked_prefill=True \
  --tasks openllm \
  --write_out \
  --batch_size auto \
  --output_path output_dir \
  --show_config

</details>

Accuracy

<table> <thead> <tr> <th>Category</th> <th>Metric</th> <th>swiss-ai/Apertus-8B-Instruct-2509</th> <th>RedHatAI/Apertus-8B-Instruct-2509-FP8-dynamic</th> <th>Recovery (%)</th> </tr> </thead> <tbody> <!-- OpenLLM Leaderboard V1 --> <tr> <td rowspan="7"><b>OpenLLM V1</b></td> <td>ARC-Challenge (Acc-Norm, 25-shot)</td> <td>65.02</td> <td>65.59</td> <td>101.4</td> </tr> <tr> <td>GSM8K (Strict-Match, 5-shot)</td> <td>58.07</td> <td>55.50</td> <td>95.6</td> </tr> <tr> <td>HellaSwag (Acc-Norm, 10-shot)</td> <td>80.87</td> <td>81.06</td> <td>100.2</td> </tr> <tr> <td>MMLU (Acc, 5-shot)</td> <td>61.97</td> <td>61.86</td> <td>99.8</td> </tr> <tr> <td>TruthfulQA (MC2, 0-shot)</td> <td>58.14</td> <td>58.18</td> <td>100.1</td> </tr> <tr> <td>Winogrande (Acc, 5-shot)</td> <td>75.14</td> <td>75.45</td> <td>100.4</td> </tr> <tr> <td><b>Average Score</b></td> <td><b>66.54</b></td> <td><b>66.33</b></td> <td><b>99.7</b></td> </tr> </tbody> </table>