GLM-5.3-Flash-RFA-RFI8-8xR9700

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GLM-5.3-Flash · RFA + RFI8 composite quant (8× R9700 / RDNA4)

A self-quantized derivative of zai-org/GLM-5.3-Flash, tuned for 8× AMD Radeon R9700 (gfx1201 / RDNA4)

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Model card

This is a composite-quantized checkpoint of Z.ai's GLM-5.3-Flash — the first natively multimodal model in the GLM-5 series (321B total / ~18B active parameters). It was quantized from the official FP8 release using the tcclaviger/vllm composite quantizer and is intended to be served with vLLM on RDNA4 (AMD Radeon R9700) hardware.

📦 Companion serving repo: GLM-5.3-Flash-rocm-r9700 — the ROCm/RDNA4 overlay + quantization recipe.

Benchmark

Details

• Reasoning Effort: high
• Max Output Len: 32k Tokens

Total Context Limit for each task in test 32k, means 6x tasks use more than 32k output tokens

Serving performance (8× R9700, FY2026-09 production config)

MTP speculative decoding: mean acceptance length ~3.7–3.9 of 4 draft tokens, average draft acceptance 91–97% (live engine metrics, GPQA-style prompts).

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Table of contents

• Attribution & credits
• Quantization
• Quick start
• Model details
• Multimodal policy
• Known limitations
• License

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Attribution & credits

The composite RFA + RFI8 quantization scheme, its kernels, and the serving runtime are provided by tcclaviger/vllm (IronLLM Labs). This checkpoint is the result of applying a quantization recipe (archspec + source patches + kda-remap, in the companion repo) on top of that stack, and a port of the GLM-5.3-Flash architecture to the RDNA4 serving path.

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Quantization

The checkpoint mixes three schemes in one quant_method: "rfi" composite:

Average bits-per-weight

bpw = (total safetensors bytes × 8) / total parameters
    = (197,843,715,288 × 8) / 321,342,220,638
    = 4.9254  ≈  4.93 bpw

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Quick start

docker pull tcclaviger/vllm:latest

git clone https://huggingface.co/djdeniro/GLM-5.3-Flash-rocm-r9700 overlay

# current production config (MTP spec=3, fp8 KV, 300k context)
docker run --rm --tty --ipc=host --shm-size=128g \
  --device /dev/kfd:/dev/kfd --device /dev/dri:/dev/dri \
  -v /path/to/GLM-5.3-Flash-RFA-RFI8-8xR9700:/models:ro \
  -v "$PWD/overlay":/overlay:ro \
  --entrypoint bash tcclaviger/vllm:latest \
  -c "/overlay/apply_overlay.sh && GLM5_NEXT_MTP_PROPOSER=1 exec vllm serve /models \
      --served-model-name glm53-flash --trust-remote-code --quantization rfi \
      --tensor-parallel-size 8 --gpu-memory-utilization 0.9575 \
      --max-model-len 300000 --max-num-seqs 4 --max-num-batched-tokens 2048 \
      --kv-cache-dtype fp8 \
      --speculative-config '{\"method\":\"mtp\",\"num_speculative_tokens\":3}' \
      --enable-prefix-caching --distributed-executor-backend mp \
      --compilation-config '{\"cudagraph_capture_sizes\":[1,2,4,8,16],\"cudagraph_mode\":\"FULL_AND_PIECEWISE\",\"cudagraph_copy_inputs\":true}'"

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Model details

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Multimodal policy

Images are resized with aspect ratio preserved, clamped to min 384×384 / max 1280×1280, and fed with a min/max image-token budget. The model accepts image and video inputs natively.

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Known limitations

• fp8 KV without runtime calibration — serve with --kv-cache-dtype fp8 and scales fixed at 1.0. Do not enable --calculate-kv-scales: runtime calibration on the profile dummy-run produces garbage scales from the uninitialized KDA recurrent state (details in the serving repo).
• The 300k context / MTP spec=3 config presumes the VRAM headroom of the 256 GB 8× R9700 node.
• Chat needs reasoning_effort="low" — the default Reasoning Effort Max spends 16k+ tokens thinking before producing content on long generations.

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License

MIT. Base model © Z.ai (zai-org), MIT license. Quantizer & runtime © IronLLM Labs (tcclaviger/vllm).