{"event":{"id":"evt-2025q3-metr-rct","dedupe_key":"historical_material_change:2025-07-10:metr-publishes-experienced-developer-productivity-experiment","event_type":"historical_material_change","title":"METR publishes experienced-developer productivity experiment","summary":"A randomized study of sixteen experienced developers reports slower completion with early-2025 AI tools on their own repositories.","occurred_at":"2025-07-10T00:00:00.000Z","published_at":"2025-07-10T00:00:00.000Z","observed_at":"2026-10-10T06:24:42.000Z","reconstructed_at":"2026-10-10T06:24:42.000Z","ingest_type":"live_world_scan","locations":null,"status":"verified","confidence":0.96,"metadata":{"what_happened_at_time":"A randomized study of sixteen experienced developers reports slower completion with early-2025 AI tools on their own repositories.","what_must_not_be_inferred":"The measured nineteen-percent slowdown is specific to this sample and setting, not every developer or later model.","availability_status":"published_empirical_study","affected_layers":["layer-human","layer-research","layer-software"],"epistemic_status":"observed_fact","reported_capabilities_are_actor_claims":true,"time_precision":"day"},"created_at":"2026-10-10T08:31:22.776Z","updated_at":"2026-10-10T08:31:22.776Z"},"artifacts":[{"id":"art-2025q3-metr-rct","dedupe_key":"f1d695185704392583894cf8956ad34939c7a25da03082a15204a05b82037924","canonical_url":"https://metr.org/blog/2025-07-10-early-2025-ai-experienced-os-dev-study/","evidence_locator":"","artifact_type":"research_report","title":"METR publishes experienced-developer productivity experiment","summary":"A randomized study of sixteen experienced developers reports slower completion with early-2025 AI tools on their own repositories.","creator_entities":["METR"],"released_at":"2025-07-10T00:00:00.000Z","content_hash":null,"metadata":{"historical_scope":"2025-Q3","availability_status":"published_empirical_study"},"created_at":"2026-10-10T08:31:22.769Z","updated_at":"2026-10-10T08:31:22.769Z","relation":"documented_by"}],"signals":[{"id":"sig-2025q3-metr-rct","statement":"A randomized study of sixteen experienced developers reports slower completion with early-2025 AI tools on their own repositories. The measured nineteen-percent slowdown is specific to this sample and setting, not every developer or later model.","signal_type":"historical_layer_delta","direction":"mixed","confidence":0.9,"epistemic_status":"supported_inference","mapping_mode":"retrospective","reconstructed_at":"2026-10-10T06:24:42.000Z","created_at":"2026-10-10T08:31:22.783Z","updated_at":"2026-10-10T08:31:22.783Z"}]}