{
  "step": "train_sft",
  "created_at": "2026-10-11T01:01:15+00:00",
  "git_commit": "8b5b96deec230e17c55784177f60235498b92bb2-dirty",
  "inputs": {},
  "input_records": {},
  "config": {
    "training_purpose": "benign_sft",
    "seed": 42,
    "max_tokens": 250000000,
    "tokens_per_step": 500000,
    "save_token_milestones": [
      250000000
    ],
    "pack_length": {
      "qwen3_5_moe": 31250,
      "gemma4": 15625
    },
    "optimizer": {
      "lr": 2e-06,
      "min_lr": 1e-07,
      "lr_decay_style": "cosine",
      "lr_warmup_fraction": 0.1,
      "weight_decay": 0.05,
      "clip_grad": 1.0,
      "muon_momentum": 0.95,
      "muon_use_nesterov": true,
      "muon_scale_mode": "spectral",
      "muon_extra_scale_factor": 0.2,
      "muon_scalar_optimizer": "adam"
    }
  },
  "args": {},
  "results": {
    "step": 500,
    "total_steps": 500,
    "nominal_tokens": 250000000,
    "consumed_tokens": 249586222,
    "nominal_tokens_per_step": 500000
  },
  "public_release": {
    "repo_id": "AI45Research/REX-Intern-S2-Bio-F3",
    "version": "v0.1.0",
    "node": "F3",
    "sft_nominal_tokens": 250000000,
    "record_is_redacted": true,
    "omitted": [
      "private_paths",
      "data_recipe",
      "nested_private_provenance",
      "training_logs"
    ],
    "source_record_step": "train_sft",
    "original_experts": 256,
    "expanded_experts": 264,
    "note": "Release metadata is a public projection; it is not a complete training record. The endpoint is selected by the private final index; missing source provenance is not reconstructed.",
    "code_revision": "b0178042de27ad2c0679a483da93bad6b2dbb76b"
  }
}