{ "utc": "2026-09-30T01:03:13.145569+00:00", "selected": "unchanged base recipe: lr1e-4 wd.1 dropout.1 width128 phi6 budget128000", "reason": "Two-layer development achieves sustained >90% held-out composition and 97.08% fixed endpoint; no retuning needed. Four-layer reference also succeeds. All development endpoints retained; no confirmation worlds read.", "development": { "dev-d2-original": { "parameters": 416512, "training_seconds": 125.8127673609415, "evaluation_seconds": 1.1260491695720702, "endpoint": { "step": 128000, "utc": "2026-09-30T01:00:16.690367+00:00", "parameters": 416512, "training_seconds": 125.8127673609415, "capture_seconds": 0.6041618440067396, "examples": 32768000, "counts": { "atomic": 4889904, "composite": 27878096 }, "effective_input_tokens": 126182096, "supervised_tokens": 65536000, "estimated_training_flops": 318196678656000, "last_batch_loss": 0.004912014119327068, "atomic": { "n": 1024, "answer_accuracy": 1.0, "accuracy": 1.0, "nll": 6.468004357884638e-06 }, "train_composite": { "n": 5838, "answer_accuracy": 1.0, "accuracy": 1.0, "nll": 5.646218596666586e-06 }, "test_composite": { "n": 754, "answer_accuracy": 0.9708222811671088, "accuracy": 0.9708222811671088, "nll": 0.04894252493977547 }, "ood_composite": { "n": 14, "answer_accuracy": 0.0, "accuracy": 0.0, "nll": 6.5166850090026855 }, "two_calls": { "n": 754, "answer_accuracy": 1.0, "accuracy": 1.0, "nll": 5.410871835920261e-06 }, "evaluation_seconds": 1.1260491695720702 } }, "dev-d4-reference": { "parameters": 813056, "training_seconds": 182.0216330656549, "evaluation_seconds": 1.648130600224249, "endpoint": { "step": 128000, "utc": "2026-09-30T01:01:28.449357+00:00", "parameters": 813056, "training_seconds": 182.0216330656549, "capture_seconds": 0.5995612218976021, "examples": 32768000, "counts": { "atomic": 4889904, "composite": 27878096 }, "effective_input_tokens": 126182096, "supervised_tokens": 65536000, "estimated_training_flops": 629044936704000, "last_batch_loss": 0.0007603238918818533, "atomic": { "n": 1024, "answer_accuracy": 1.0, "accuracy": 1.0, "nll": 3.510803480821778e-06 }, "train_composite": { "n": 5838, "answer_accuracy": 1.0, "accuracy": 1.0, "nll": 5.936707566434052e-06 }, "test_composite": { "n": 754, "answer_accuracy": 0.9893899204244032, "accuracy": 0.9893899204244032, "nll": 0.014771726913750172 }, "ood_composite": { "n": 14, "answer_accuracy": 0.07142857142857142, "accuracy": 0.07142857142857142, "nll": 4.617985248565674 }, "two_calls": { "n": 754, "answer_accuracy": 1.0, "accuracy": 1.0, "nll": 2.9723194074904313e-06 }, "evaluation_seconds": 1.648130600224249 } } }, "confirmation_worlds": [ 143011, 143012, 143013 ], "initializations": [ 14301, 14302 ], "primary_runs": [ "conf-w143011-s14301-d1", "conf-w143011-s14301-d2", "conf-w143011-s14302-d1", "conf-w143011-s14302-d2", "conf-w143012-s14301-d1", "conf-w143012-s14301-d2", "conf-w143012-s14302-d1", "conf-w143012-s14302-d2", "conf-w143013-s14301-d1", "conf-w143013-s14301-d2", "conf-w143013-s14302-d1", "conf-w143013-s14302-d2" ], "conditional_wide_runs": [ "conf-w143011-s14301-d1wide", "conf-w143011-s14302-d1wide", "conf-w143012-s14301-d1wide", "conf-w143012-s14302-d1wide", "conf-w143013-s14301-d1wide", "conf-w143013-s14302-d1wide" ], "parameter_control": { "width": 180, "parameters": 419220, "two_layer_parameters": 416512, "relative_difference": 0.0065016133988937685, "selection": "nearest parameter count over widths multiple of 4; no accuracy used" }, "boundary": "Shared training recipe, not per-depth optimal hyperparameters; no linear scaling law from two depths." }