{"citations":{"source_mix":{"company_owned":17,"independent":20,"unclear":0},"sources_referenced_by_questions":0,"support_mix":{"direct":27,"partial":1},"total_sources":37,"unique_domain_count":22},"claims":[{"claim_id":"claim-001","confidence":"verified","observed_at":"2026-09-27","platform_support":["anthropic","deepseek","google","grok","kimi","openai","perplexity"],"predicate":"platforms_analyzed","qualifier":"valid included platform responses","subject":"Best Perch Stairlifts for Narrow Stairs","unit":"platforms","value":7},{"claim_id":"claim-002","confidence":"verified","observed_at":"2026-09-27","platform_support":["anthropic","google"],"predicate":"final_consensus_rank","qualifier":"Perching Seat for Tight Staircases","subject":"Acorn 120 Perch","unit":"rank","value":3},{"claim_id":"claim-003","confidence":"verified","observed_at":"2026-09-27","platform_support":["anthropic","google"],"predicate":"platform_mentions","qualifier":"out of 7","subject":"Acorn 120 Perch","unit":"platforms","value":2},{"claim_id":"claim-004","confidence":"verified","observed_at":"2026-09-27","platform_support":["grok"],"predicate":"fit_rating_count","qualifier":"strong","subject":"Acorn 120 Perch","unit":"platforms","value":1},{"claim_id":"claim-005","confidence":"verified","observed_at":"2026-09-27","platform_support":["anthropic","google"],"predicate":"fit_rating_count","qualifier":"good","subject":"Acorn 120 Perch","unit":"platforms","value":2},{"claim_id":"claim-006","confidence":"verified","observed_at":"2026-09-27","platform_support":["perplexity"],"predicate":"fit_rating_count","qualifier":"mixed","subject":"Acorn 120 Perch","unit":"platforms","value":1},{"claim_id":"claim-007","confidence":"verified","observed_at":"2026-09-27","platform_support":["openai","deepseek","kimi"],"predicate":"fit_rating_count","qualifier":"uncertain","subject":"Acorn 120 Perch","unit":"platforms","value":3}],"content_scope":"aggregated facts, computed metrics, and retrieval summaries","entities":[{"average_rank":2,"best_rank":1,"entity_id":"entity-001","entity_type":"company","final_rank":3,"name":"Acorn 120 Perch","platform_mentions":2,"platform_share":0.2857142857142857}],"identity":{"dataset_url":"https://aginginplaceindex.com/datasets/stairlifts/perching-seat-for-tight-staircases/acorn-120-perch.json","page_url":"https://aginginplaceindex.com/stairlifts/perching-seat-for-tight-staircases/acorn-120-perch","report_type":"fit_review","study_id":"AIPI-STUDY-38DF9851FEDD","title":"Acorn 120 Perch Review for Narrow Stairs"},"limitations":["Use the run researchdate as the study date. Platform-reported dates are provenance metadata and do not independently prove freshness.","All included platforms evaluated fit, but platformmentions counts only platforms that named the entity during ranking discovery.","Do not resolve conflicting product names, pricing, or capabilities by guessing; describe the conflict and tell buyers what to verify.","The supplied URLs were collected from platform responses and were not independently validated by the writer stage.","Platform-reported research dates differ from the authoritative run date; disclose this as a methodology limitation.","Citations are platform-reported evidence, not independently verified facts. No-search model claims require explicit verification before being described as current facts."],"methodology":{"fit_rating_contract":["strong","good","mixed","weak","uncertain"],"included_valid_platform_count":7,"maximum_finalists":10,"minimum_mentions":2,"name":"Aging in Place Index cross-platform AI consensus analysis","platforms_included":["anthropic","deepseek","google","grok","kimi","openai","perplexity"],"platforms_queried":["openai","anthropic","deepseek","grok","perplexity","kimi","google"],"stages":["ranking_discovery","fit_assessment","normalization","editorial_synthesis"],"version":"alias-table-1"},"provenance":{"generated_at":"2026-09-27 14:33:52.868892+00","research_date":"2026-09-27","source_snapshot_sha256":"b59a582233be2ffe9ae286a7c22301b92f01de4deff24057e005adfe546eeebd","verification_scope":"public_verification"},"ranking":{"candidates_evaluated":8,"qualified_finalists":5,"ranking_unit":"Perch stairlift model and manufacturer"},"schema_version":4,"summary":"The Acorn 120 Perch is a plausible but unconfirmed fit for perching seats on tight staircases. Only 2 of 7 platforms named it during ranking discovery, and those two disagreed sharply: Anthropic rated it \"good,\" while OpenAI rated it \"uncertain\" because it could not verify the 120 Perch as a current U.S. product. The strongest reason to consider it is its compact perch geometry — roughly 22 inches overall width and 13 inches folded depth — which reduces knee projection on narrow straight stairs (, grok:). The main limitation is that Acorn's own U.S. materials document the Acorn 130, not a…","target_buyer":"Homeowners with narrow staircases where a traditional seated stairlift would block access or create clearance issues","topic":{"base_category":"Stairlifts","category_criteria":["Minimum staircase width","perch seat angle","folded footprint","rail profile","knee clearance","swivel/parking options","safety sensors","installation requirements"],"geography":"United States","slug":"best-perch-stairlifts-for-narrow-stairs","title":"Best Perch Stairlifts for Narrow Stairs","use_case":"Perching Seat for Tight Staircases"}}