{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Writing: A Postmortem Of Three Recent Issues","description":"Anthropic writing signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/fb27b506-9165-4ad8-b7a8-43be540074f2","json_url":"https://onlylabs.fyi/signals/fb27b506-9165-4ad8-b7a8-43be540074f2/signal.json","generated_at":"2026-06-11T04:15:09.423394+00:00","org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab","category_label":"Frontier lab","dossier_url":"https://onlylabs.fyi/labs/anthropic","dossier_json_url":"https://onlylabs.fyi/labs/anthropic/dossier.json"},"related_urls":{"signal":"https://onlylabs.fyi/signals/fb27b506-9165-4ad8-b7a8-43be540074f2","signal_json":"https://onlylabs.fyi/signals/fb27b506-9165-4ad8-b7a8-43be540074f2/signal.json","source":"https://www.anthropic.com/engineering/a-postmortem-of-three-recent-issues","lab_dossier":"https://onlylabs.fyi/labs/anthropic","lab_dossier_json":"https://onlylabs.fyi/labs/anthropic/dossier.json","analysis":"https://onlylabs.fyi/analysis/anthropic","analysis_json":"https://onlylabs.fyi/analysis/anthropic/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/anthropic/evidence.json","category":"https://onlylabs.fyi/frontier","category_json":"https://onlylabs.fyi/frontier.json","category_feed":"https://onlylabs.fyi/frontier/feed.xml","category_signals_json":"https://onlylabs.fyi/signals.json","topic":"https://onlylabs.fyi/topics/talking","topic_signals_json":"https://onlylabs.fyi/topics/talking/signals.json","topic_feed":"https://onlylabs.fyi/topics/talking/feed.xml","data_business":null},"answer_pack":{"answer":"Anthropic published A Postmortem Of Three Recent Issues. 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Below we explain what happened, why it took time to fix, and what we're changing. Between August and early September, three infrastructure bugs intermittently degraded Claude's response quality. We've now resolved these issues and want to explain what happened. In early August, a number of users began reporting degraded responses from Claude. These initial reports were difficult to distinguish from normal variation in user feedback. By late August, the increasing frequency and persistence of these reports prompted us to open an investigation that led us to uncover three separate infrastructure bugs. To state it plainly: We never reduce model quality due to demand, time of day, or server load. The problems our users reported were due to infrastructure bugs alone. We recognize users expect consistent quality from Claude, and we maintain an extremely high bar for ensuring infrastructure changes don't affect model outputs. In these recent..."},"evidence_pages":[{"url":"https://www.anthropic.com/engineering/a-postmortem-of-three-recent-issues","final_url":"https://www.anthropic.com/engineering/a-postmortem-of-three-recent-issues","title":"A Postmortem Of Three Recent Issues","http_status":200,"content_type":"text/html; charset=utf-8","capture_method":"plain","fetched_at":"2026-06-11T04:15:09.423394+00:00","bytes":161206,"raw_path":"955bc6c93f35e54adf8329941e8fde92c7c68e141d0233d36f7a452b08732f8f.html","content_hash":"d8379b2bcc7e69de898d6b8c6accfe38c0741ec49b63e9b63bb4632283ae444e","excerpt_chars":1200,"truncated":true,"excerpt":"A postmortem of three recent issues \\ Anthropic Engineering at Anthropic A postmortem of three recent issues Published Sep 17, 2025 This is a technical report on three bugs that intermittently degraded responses from Claude. Below we explain what happened, why it took time to fix, and what we're changing. Between August and early September, three infrastructure bugs intermittently degraded Claude's response quality. We've now resolved these issues and want to explain what happened. In early August, a number of users began reporting degraded responses from Claude. These initial reports were difficult to distinguish from normal variation in user feedback. By late August, the increasing frequency and persistence of these reports prompted us to open an investigation that led us to uncover three separate infrastructure bugs. To state it plainly: We never reduce model quality due to demand, time of day, or server load. The problems our users reported were due to infrastructure bugs alone. We recognize users expect consistent quality from Claude, and we maintain an extremely high bar for ensuring infrastructure changes don't affect model outputs. 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