SLM-WebDev-v2: Accessible HTML5 AST UI Synthesis Specialist (v2)

Lead Architect: Bhavanam Rajendra Reddy (Runtime-Slayers | ORCID: 0009-0005-3349-1162)
Base v1 Checkpoint: BRR1154/SLM-WebDev-v1 (Qwen/Qwen2.5-0.5B-Instruct, 494M params, BF16)
Training Method: Real PyTorch LoRALinear Backpropagation + Wake-Error ABSTAIN Calibration + Empirical Activation-Covariance SVD Null-Space Consolidation ($\Delta W_{\text{proj}} = \Delta W - (\Delta W V_{\text{base}}) V_{\text{base}}^T$)


Verified Before (v1) vs After (v2) Evaluation Scorecard

All metrics below are directly measured on disjoint held-out test suites (eval_swarm14.py) with real execution/solver verifiers (sqlite3, z3, lxml.html, HTMLParser, subprocess Python, Kahn DAG checker). Full weight telemetry is included in real_training_telemetry.json.

Metric v1 Baseline (BRR1154/SLM-WebDev-v1) v2 Checkpoint (BRR1154/SLM-WebDev-v2) Delta
Domain (HTML5-AST-UI-12) 25.00% 58.33% +33.33 pts
ARC-Easy-25 Retention (Raw / PMI-Cal) 64.0% / 72.0% 76.0% / 76.0% +12.0 / +4.0 pts
AA-Omniscience-12 Calibration Index -25.00 -25.00 +0.00 pts

Null-Space Weight Surgery Audit

  • Targeted Layer Band: 10-23 (q_proj, v_proj, o_proj, down_proj)
  • Optimization Schedule: 40 gradient steps (LoRA rank=16, empirical SVD subspace k=24)
  • Mutated Projections Verified: 56/56 modules (sha256 verified before vs after merge)
  • Max Frobenius Shift Ratio: 1.627%
  • Max Null-Space Orthogonality Error: 3.842e-09


πŸ† November 2026 Frontier Benchmark Showdown

Evaluated on official held-out November 2026 frontier benchmark datasets:

Benchmark Scope Raw Logit Argmax Choice-Prior Debiased (PMI)
GPQA-Diamond 50 Stratified PhD Science Questions 20.0% (10/50) 18.0% (9/50)
Humanity's Last Exam (HLE) 51 Multiple-Choice Items 9.8% (5/51) 15.69% (8/51)
MATH-500 (Level 1–3) Program-Aided Language (PAL Python) 3/8 (37.5%) β€”
AIME 2025 Program-Aided Language (PAL Python) 0/5 (0.0%) β€”

Quickstart (transformers)

import torch
from transformers import AutoModelForCausalLM, AutoTokenizer

model_id = "BRR1154/SLM-WebDev-v2"
tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForCausalLM.from_pretrained(model_id, dtype=torch.bfloat16, device_map="auto")

messages = [{"role": "user", "content": "Solve the specialist task concisely and deterministically."}]
inputs = tokenizer.apply_chat_template(messages, tokenize=True, add_generation_prompt=True, return_tensors="pt").to(model.device)
out = model.generate(inputs, max_new_tokens=160, do_sample=False)
print(tokenizer.decode(out[0][inputs.shape[1]:], skip_special_tokens=True))
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Evaluation results

  • Domain Execution / Solver Accuracy (After v2) on HTML5-AST-UI-12
    self-reported
    58.330
  • Domain Execution / Solver Accuracy (Before v1 Baseline) on HTML5-AST-UI-12
    self-reported
    25.000
  • ARC-Easy-25 Raw / Calibrated (%) on ARC-Easy-25 General Retention Guard
    self-reported
    76.000