{"event":{"id":"evt-hist-phase32-arena-alignment-index-seriesb","dedupe_key":"ai_evaluation_benchmark_publication:2026-10-08:arena-announces-alignment-index-alongside-200-million-series-b","event_type":"ai_evaluation_benchmark_publication","title":"Arena announces Alignment Index alongside $200 million Series B","summary":"Arena introduced an Alignment Index Oct 8 using self-reported 90,000 real-world agent sessions and 27 model comparisons, alongside a company-announced $200M Series B at $3.1B valuation. Metrics are methodology- and publisher-dependent; source does not imply all alignment failures are detected.","occurred_at":"2026-10-08T00:00:00.000Z","published_at":"2026-10-08T00:00:00.000Z","observed_at":"2026-10-18T11:05:00.000Z","reconstructed_at":"2026-10-18T11:05:00.000Z","ingest_type":"historical_backfill","locations":null,"status":"verified","confidence":0.88,"metadata":{"evidence_only":1,"global_novelty_not_proven":1,"no_production_writes":1,"original_position_1based":1163,"source_claims_not_independently_replicated":1},"created_at":"2026-10-19T06:00:54.305Z","updated_at":"2026-10-19T06:00:54.305Z"},"artifacts":[{"id":"art-hist-phase32-arena-alignment-index-seriesb","dedupe_key":"2b7c428788c88fd72377278615263c66d9b829cfab7ea9210512f9da45bbdb96","canonical_url":"https://arena.ai/blog/ai-alignment-index","evidence_locator":"","artifact_type":"original_publication","title":"Arena announces Alignment Index alongside $200 million Series B","summary":"","creator_entities":[],"released_at":"2026-10-08T00:00:00.000Z","content_hash":null,"metadata":[],"created_at":"2026-10-19T06:00:54.301Z","updated_at":"2026-10-19T06:00:54.301Z","relation":"documented_by"}],"signals":[]}