GLM-5.2-SIQ-Fruit-Instruct

The assistant-masked SFT variant of GLM-5.2-SIQ-Fruit: a 5.04B-parameter, 0.46B-active GLM-5.2 serving proxy with MLA, a KL-distilled DSA indexer, 256 routed experts, and one MTP draft layer.

This variant uses the real GLM chat template with enable_thinking=false. Templated multi-turn requests, tool-shaped prompts, stop tokens, and MTP speculation therefore exercise the same serving paths as the base artifact. It remains a CI fixture: expect small-model answers in the right protocol, not general-assistant quality.

Runtime requirement: the SIQ/Trellis checkpoint needs a compatible b12x/SparkInfer + vLLM build. Stock vLLM and Transformers do not implement its exl3-trellis expert tensors.

SFT stage

Training ran for 4,000 steps at 4,096 context with batch size 6×4 on 4× NVIDIA H200 GPUs—about 393M sampled tokens. Loss was restricted to assistant tokens; deterministic chat-header tokens were masked, while the yield/stop token and per-conversation EOS remained supervised.

Configured source lanes:

source	configured weight	published tokens	note
GLM-5.2 regen	0.65	210.3M	offline distillation
GLM-5.2 Magpie UltraChat	0.25	90.0M	only conversations with finish_reason="stop"
Aider trajectories	0.05	3.4M	contaminates Aider/Exercism-style evaluation
live GLM-5.2 distillation	0.01	0.6M	license-reasoning and personality channels
FineWeb-Edu replay	0.07	source pool 1.50B	forgetting guard
Wikipedia replay	0.03	source pool 500.3M	forgetting guard

Final global validation loss: 2.2795. Assistant-masked source losses were regen 1.90, Magpie 1.99, Aider 1.11, and live 2.05. Replay losses were FineWeb-Edu 3.47 and Wikipedia 3.16, versus 3.45/3.14 before SFT.

Artifact

• Non-expert tensors: BF16.
• Ordinary MoE layers: 96 K4 + 160 K3 experts.
• MTP layer: uniform K3.
• Tensor payload: 3,098,041,856 bytes (2.885 GiB).
• RoPE theta: 500,000 in both supported configuration locations.
• MANIFEST.sha256 authenticates every serving artifact except the card and Git attributes.

Measured validation

Hardware: RTX 5090; custom gilded-gnosis runtime images.

check	result
r25 fp8_ds_mla small-prompt battery and recitation	PASS
r28 nvfp4_ds_mla + sparse MLA battery	PASS
MTP k=1 acceptance	451/571 = 79.0%
greedy chat battery	3/4 answered and stopped within 700 tokens; one coherent response reached the cap
Apache-2.0 held-out needle	0.000 overlap; MIT in-corpus control 0.974

SFT shifts the output distribution, so its MTP acceptance is lower than the base model's 94.1%. The drafter still clears the 50% hard acceptance gate used by the harness.

Serving

On a compatible runtime image:

vllm serve malaiwah/GLM-5.2-SIQ-Fruit-Instruct \
  --kv-cache-dtype fp8_ds_mla

# MTP speculative decoding
vllm serve malaiwah/GLM-5.2-SIQ-Fruit-Instruct \
  --kv-cache-dtype fp8_ds_mla \
  --speculative-config '{"method":"mtp","num_speculative_tokens":1}'

The r28 validation path also supports nvfp4_ds_mla.

Limitations and contamination

• This model is intentionally contaminated for Aider/Exercism-style evaluation by its published trajectory corpus. Do not report those scores as clean generalization.
• The chat check is a protocol/serving smoke, not a broad instruction-following evaluation.
• The model is too small and narrowly trained for deployment as an assistant.

Reproducibility

Training inputs are documented at fruit-phase1-shards. Model-only and resumable stage states are at fruit-phase1-ckpt. Trainer, exporter, gauntlet, and review evidence: github.com/malaiwah/proxy-fruit.