{"@context":"https://neupai.io/schema/v0.2","@type":"StructuredNewsArticle","identity":{"article_id":"tech42_20260423_anthropic-claude-performance-issue","canonical_url":"https://www.tech42.co.kr/%ec%9d%98%eb%8f%84%ec%a0%81-%ec%84%b1%eb%8a%a5-%ec%a0%80%ed%95%98-%ec%95%84%eb%8b%88%ec%97%88%eb%8b%a4%ec%95%a4%ed%8a%b8%eb%a1%9c%ed%94%bd-%ed%81%b4%eb%a1%9c%eb%93%9c-%ec%84%b1%eb%8a%a5/?utm_source=rss&utm_medium=rss&utm_campaign=%25ec%259d%2598%25eb%258f%2584%25ec%25a0%2581-%25ec%2584%25b1%25eb%258a%25a5-%25ec%25a0%2580%25ed%2595%2598-%25ec%2595%2584%25eb%258b%2588%25ec%2597%2598%25eb%258b%25a4%25ec%2595%25a4%25ed%258a%25b8%25eb%25a1%259c%25ed%2594%25bd-%25ed%2581%25b4%25eb%25a1%259c%25eb%2593%259c-%25ec%2584%25b1%25eb%258a%25a5","ai_url":null,"publisher":{"name":"테크42","domain":"www.tech42.co.kr","type":"online"},"author":"버트","published_at":"2026-04-23T22:53:04.000Z","updated_at":null,"language":"en","article_type":"straight_news","originality":"self_produced"},"content":{"headline":"\"No intentional performance degradation\"...Anthropic reveals 3 causes of Claude performance decline","summary":"Anthropic has published a post-incident analysis report revealing three causes of Claude's code performance decline. The company stated that reduced reasoning effort levels, prompt caching bugs, and system prompt streamlining affected performance at different times.","topics":["artificial intelligence","software"],"geography":["US"],"entities":[{"name":"Anthropic","canonical_id":"corp:us:anthropic","type":"company","role_in_article":"primary_subject","metadata":{"ticker":null,"parent":null}},{"name":"Claude","canonical_id":"product:us:claude","type":"product","role_in_article":"primary_subject","metadata":{"ticker":null,"parent":null}},{"name":"Stella Lorenzo","canonical_id":"person:us:stella-lorenzo","type":"person","role_in_article":"quoted","metadata":{"ticker":null,"parent":null}},{"name":"AMD","canonical_id":"corp:us:amd","type":"company","role_in_article":"mentioned","metadata":{"ticker":null,"parent":null}}],"claims":[{"id":"c1","statement":"On March 4, the default reasoning effort level was downgraded from 'high' to 'medium'","as_of":"2026-03-04","as_of_explicit":true,"as_of_raw":"March 4","source_type":"company_disclosure","comparison":null,"type":"fact","figures":null,"expiry_hint":null,"insight":null},{"id":"c2","statement":"On April 7, Opus 4.7 default was restored to 'xhigh'","as_of":"2026-04-07","as_of_explicit":true,"as_of_raw":"April 7","source_type":"company_disclosure","comparison":null,"type":"fact","figures":null,"expiry_hint":null,"insight":null},{"id":"c3","statement":"On March 26, a prompt caching optimization bug was deployed","as_of":"2026-03-26","as_of_explicit":true,"as_of_raw":"March 26","source_type":"company_disclosure","comparison":null,"type":"fact","figures":null,"expiry_hint":null,"insight":null},{"id":"c4","statement":"On April 10, the prompt caching bug was fixed in version v2.1.101","as_of":"2026-04-10","as_of_explicit":true,"as_of_raw":"April 10","source_type":"company_disclosure","comparison":null,"type":"fact","figures":null,"expiry_hint":null,"insight":null},{"id":"c5","statement":"On April 16, system prompt streamlining instructions were added","as_of":"2026-04-16","as_of_explicit":true,"as_of_raw":"April 16","source_type":"company_disclosure","comparison":null,"type":"fact","figures":null,"expiry_hint":null,"insight":null},{"id":"c6","statement":"Responses between tool calls were limited to 25 words, and final responses to within 100 words","as_of":"2026-04-16","as_of_explicit":false,"as_of_raw":"April 16","source_type":"company_disclosure","comparison":null,"type":"fact","figures":null,"expiry_hint":null,"insight":null},{"id":"c7","statement":"A 3% decline occurred in coding quality evaluation","as_of":"2026-04","as_of_explicit":false,"as_of_raw":"system prompt streamlining instructions added on April 16","source_type":"company_disclosure","comparison":"baseline","type":"fact","figures":null,"expiry_hint":null,"insight":null},{"id":"c8","statement":"On April 20, system prompt streamlining was reverted","as_of":"2026-04-20","as_of_explicit":true,"as_of_raw":"April 20","source_type":"company_disclosure","comparison":null,"type":"fact","figures":null,"expiry_hint":null,"insight":null},{"id":"c9","statement":"Analyzed 6,852 session files and over 234,000 tool calls","as_of":"2026-04","as_of_explicit":false,"as_of_raw":"detailed report","source_type":"research_paper","comparison":null,"type":"fact","figures":null,"expiry_hint":null,"insight":null},{"id":"c10","statement":"As of April 23, usage limits for all subscribers were reset","as_of":"2026-04-23","as_of_explicit":true,"as_of_raw":"as of April 23","source_type":"company_disclosure","comparison":null,"type":"fact","figures":null,"expiry_hint":null,"insight":null}],"ai_emotional_context":{"valence":0,"arousal":0,"primary_emotions":[],"secondary_emotions":[],"emotional_triggers":[]}},"provenance":{"source_chain":["primary_reporting"],"original_source_url":null,"related_articles":[]},"temporal":{"freshness":"recent","next_update_expected":null},"access":{"license":"neupai_standard","attribution_required":true,"structured_data":"free","full_text_available":false,"full_text_access":null}}