{"id":78031,"date":"2026-04-26T13:51:47","date_gmt":"2026-04-26T10:51:47","guid":{"rendered":"https:\/\/saudishopper.com.sa\/en\/claude-degradation-issues-resolved-anthropic\/"},"modified":"2026-04-26T13:51:49","modified_gmt":"2026-04-26T10:51:49","slug":"claude-degradation-issues-resolved-anthropic","status":"publish","type":"post","link":"https:\/\/saudishopper.com.sa\/en\/claude-degradation-issues-resolved-anthropic\/","title":{"rendered":"Anthropic Identifies and Fixes Three Issues Behind Claude Performance Decline"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Claude degradation issues have been resolved by Anthropic, which identified and fixed three separate problems that caused Claude&#8217;s responses to decline for some users over the past month, the company said in a detailed postmortem published April 23. All three problems have been fixed as of April 20 in version 2.1.116, with the API and inference layer remaining unaffected throughout.<\/p><p class=\"wp-block-paragraph\">The <a href=\"\/category\/artificial-intelligence\/\">Claude degradation issues<\/a> stemmed from changes to Claude Code, the Claude Agent SDK, and Claude Cowork. The first involved a shift in default reasoning effort from high to medium on March 4, which was intended to reduce latency but resulted in lower output quality. Anthropic reverted this change on April 7 after users reported preferring higher intelligence by default, affecting Sonnet 4.6 and Opus 4.6 models.<\/p><p class=\"wp-block-paragraph\">A second problem emerged from a caching optimization deployed March 26. The change was designed to clear older reasoning from idle sessions lasting over an hour, but a bug caused it to clear reasoning on every turn instead of once. This made Claude appear forgetful and repetitive, as the model lost context of its prior decisions. The issue was particularly compounded when users sent follow-up messages while Claude executed tool commands. Anthropic fixed this on April 10 in version 2.1.101, affecting Sonnet 4.6 and Opus 4.6.<\/p><h2 class=\"wp-block-heading\">Claude degradation issues traced to system prompt change<\/h2><p class=\"wp-block-paragraph\">The third issue involved a system prompt addition designed to reduce verbosity in Claude Opus 4.7. On April 16, Anthropic added a length-limiting instruction stating: &#8220;Keep text between tool calls to \u226425 words. Keep final responses to \u2264100 words unless the task requires more detail.&#8221; While internal testing showed no regressions, broader evaluations later revealed a 3 percent performance drop for both Opus 4.6 and 4.7. The company reverted this change on April 20.<\/p><p class=\"wp-block-paragraph\">Each issue affected different user segments on different schedules, creating the appearance of broad, inconsistent degradation. While Anthropic began investigating reports in early March, distinguishing them from normal variation in user feedback proved challenging at first. Neither internal usage patterns nor evaluation tests initially reproduced the problems.<\/p><h2 class=\"wp-block-heading\">Reproduction challenges delayed identification<\/h2><p class=\"wp-block-paragraph\">The caching bug proved particularly difficult to identify. Two unrelated experiments complicated reproduction efforts: an internal-only server-side experiment related to message queuing, and an orthogonal change in how thinking was displayed that suppressed the bug in most command-line interface sessions. The bug existed at the intersection of Claude Code&#8217;s context management, the Anthropic API, and extended thinking capabilities. It passed multiple human and automated code reviews, unit tests, end-to-end tests, automated verification, and internal dogfooding before discovery.<\/p><p class=\"wp-block-paragraph\">During investigation, Anthropic used Opus 4.7 to retrospectively review the code repositories that introduced the bug. Opus 4.7 identified the issue while Opus 4.6 did not, prompting the company to commit to supporting additional repositories as context for future code reviews.<\/p><h2 class=\"wp-block-heading\">Operational changes to prevent recurrence<\/h2><p class=\"wp-block-paragraph\">Anthropic outlined several changes to prevent similar issues. The company will ensure a larger share of internal staff use the exact public build of Claude Code rather than internal testing versions. It will also improve its internal Code Review tool and ship the improved version to customers.<\/p><p class=\"wp-block-paragraph\">Additionally, Anthropic is implementing tighter controls on system prompt changes. The company will run a broad suite of per-model evaluations for every <a href=\"\/category\/apps\/\">system prompt<\/a> modification, continuing ablations to measure each line&#8217;s impact. New tooling has been built to simplify prompt change reviews and auditing. The company has updated its CLAUDE.md guidance to ensure model-specific changes apply only to their intended models.<\/p><p class=\"wp-block-paragraph\">For changes that could trade off against intelligence, Anthropic will add soak periods, broader evaluation suites, and gradual rollouts to catch issues earlier. The company recently created a @ClaudeDevs account on social media to explain product decisions and reasoning in depth, with similar updates shared in centralized threads on GitHub.<\/p><h2 class=\"wp-block-heading\">Usage limits reset for all subscribers<\/h2><p class=\"wp-block-paragraph\">Anthropic reset usage limits for all subscribers on April 23 as compensation for the degraded experience. The company credited users who provided detailed feedback through the feedback command or posted specific, reproducible examples online for enabling identification and resolution of the problems.<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>&#8220;We take reports about degradation very seriously. We never intentionally degrade our models.&#8221;<\/p><cite>Anthropic, April 23 Postmortem<\/cite><\/blockquote><p class=\"wp-block-paragraph\">The detailed postmortem demonstrates Anthropic&#8217;s approach to addressing performance issues in its <a href=\"\/category\/artificial-intelligence\/\">AI<\/a> models and commitment to transparency with users regarding technical problems and their resolution.<\/p>\n\n\n<p class=\"article-source-attribution wp-block-paragraph\"><em>Source: <a href=\"https:\/\/www.anthropic.com\/engineering\/april-23-postmortem?utm_source=tldrai\" target=\"_blank\" rel=\"nofollow noopener\">anthropic.com<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Anthropic resolved three separate issues degrading Claude&#8217;s performance, affecting reasoning effort defaults, session caching, and system prompts. All issues were fixed by April 20, with usage limits reset for all subscribers.<\/p>\n","protected":false},"author":17,"featured_media":78030,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_meta-robots-noindex":"","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_pr_autopilot_social_copy":"{\"x_hook\":\"Anthropic identified and fixed three separate Claude performance issues affecting reasoning, caching, and prompts. The company reset usage limits for all subscribers and outlined new safeguards.\",\"x_takeaways\":\"Key Details:\\n\ud83d\udd39 March 4 reasoning effort change reduced intelligence; reverted April 7\\n\ud83d\udd39 March 26 caching bug caused forgetfulness; fixed April 10\\n\ud83d\udd39 April 16 verbosity prompt caused 3% performance drop; reverted April 20\"}","_yoast_wpseo_opengraph_title":"Anthropic Resolves Claude Degradation Issues","_yoast_wpseo_opengraph_description":"Anthropic identified and fixed three separate issues that caused Claude performance decline for some users. The company reset usage limits for all subscribers and outlined operational changes to prevent future degradation.","_yoast_wpseo_opengraph_image":"https:\/\/saudishopper.com.sa\/en\/wp-content\/uploads\/2026\/04\/claude-degradation-issues-anthropic-fix.webp","_yoast_wpseo_opengraph_image_id":78030,"_yoast_wpseo_twitter_title":"Anthropic Fixes Claude Degradation Issues","_yoast_wpseo_twitter_description":"Anthropic resolved three Claude degradation issues tied to reasoning effort, session caching, and system prompts. All fixed by April 20 with subscriber usage limits reset.","_yoast_wpseo_twitter_image":"https:\/\/saudishopper.com.sa\/en\/wp-content\/uploads\/2026\/04\/claude-degradation-issues-anthropic-fix.webp","_yoast_wpseo_twitter_image_id":78030,"_yoast_wpseo_primary_category":449,"_extra_hide_author_box":"","_extra_featured_post":"","_partner_post_id":107579,"footnotes":""},"categories":[442,449],"tags":[1467,3597,1466,3599,3598],"class_list":["post-78031","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-apps","category-ai","tag-anthropic","tag-api-performance","tag-claude-ai","tag-model-optimization","tag-software-debugging","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Claude degradation issues resolved by Anthropic | Saudi Shopper<\/title>\n<meta name=\"description\" content=\"Anthropic fixed three Claude degradation issues affecting reasoning, caching, and prompts. 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