{"event":{"id":"evt-hist-phase38-microsoft-mai-base2","dedupe_key":"source_publication:2026-10-15:microsoft-publishes-completed-mai-base-2-pretraining-report","event_type":"source_publication","title":"Microsoft publishes completed MAI-Base-2 pretraining report","summary":"Microsoft Oct15 reports completion of 2.8T-total / 80B-active parameter pretraining, not general API model availability.","occurred_at":"2026-10-15T00:00:00.000Z","published_at":"2026-10-15T00:00:00.000Z","observed_at":"2026-10-18T13:50:00.000Z","reconstructed_at":"2026-10-18T13:50:00.000Z","ingest_type":"historical_backfill","locations":null,"status":"verified","confidence":0.8,"metadata":{"date_precision":"day","evidence_only":1,"global_novelty_unproven":1,"original_index_position":1428,"original_supplied_day":"2026-10-15","published_at_is_day_precision_placeholder":1},"created_at":"2026-10-19T07:01:22.793Z","updated_at":"2026-10-19T07:01:22.793Z"},"artifacts":[{"id":"art-hist-phase38-microsoft-mai-base2","dedupe_key":"aaae38b726690a56eb38a3465b2b9fcf6256e9a5d42b5148919a08c121285293","canonical_url":"https://microsoft.ai/news/frontier-pre-training-at-microsoft-ai/","evidence_locator":"","artifact_type":"original_publication","title":"Microsoft publishes completed MAI-Base-2 pretraining report","summary":"","creator_entities":[],"released_at":"2026-10-15T00:00:00.000Z","content_hash":null,"metadata":[],"created_at":"2026-10-19T07:01:22.793Z","updated_at":"2026-10-19T07:01:22.793Z","relation":"documented_by"}],"signals":[]}