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Claude Code Performance Decline (Jan vs Mar)
Comparison of reasoning depth and file processing metrics between January and March.
Primary Sources
Anthropic tests reaction to yanking Claude Code from Pro
Anthropic has removed Claude Code from its Pro subscription plan, according to some of its public-facing web pages, but the company says it’s only a test for a small number of users. On Monday, the company's pricing web page stated its Pro plan “includes Claude Code." On Tuesday, that phrase is no longer present, and elsewhere on the page, the feature list for the Pro plan includes an explicit "X" rather than a check mark for Claude Code. The changes were previously noted by AI industry skeptic Ed Zitron. Anthropic’s changed product inclusions have not reached all corners of its site. At the time this article was filed, the Claude Code product page still stated the Pro plan provides access to the code generation tool. And when this reporter accessed Claude Code from the CLI, the terminal output still says "Claude Pro." Screenshot of different Anthropic web pages showing Claude Code subscriptions - Click to enlarge Claude.ai, when queried about this, insisted that the Pro plan includes Claude Code, but one of the cited documentation pages, updated today, mentions only the Max plan. Losing access to Claude Code understandably alarmed developers and that sentiment reached Anthropic, whose head of growth Amol Avasare published a social media post indicating that the change represented an experiment. "For clarity, we're running a small test on ~2 percent of new prosumer signups," he said. "Existing Pro and Max subscribers aren't affected." Why Anthropic felt that the update to its public-facing pricing page would address only some users and not the entire internet isn't entirely clear. And a company spokesperson did not respond to a follow-up question about that. Vibe coding upstart Lovable denies data leak, cites 'intentional behavior,' then throws HackerOne under the bus Claude Desktop changes app access settings for browsers you don't even have installed yet Apple has an opportunity to rediscover humanity in its push toward AI Anthropic bakes memory fixes into Bun 1.1.13 as developers complain of leaks Avasare went on to explain: "When we launched Max a year ago, it didn't include Claude Code, Cowork didn't exist, and agents that run for hours weren't a thing. Max was designed for heavy chat usage, that's it. "Since then, we bundled Claude Code into Max and it took off after Opus 4. Cowork landed. Long-running async agents are now everyday workflows. The way people actually use a Claude subscription has changed fundamentally. "Engagement per subscrib...
Claude Code 推理深度悄降 73%：Anthropic 承认调低默认强度，API 用户 4 月 7 日已恢复
Between February and March, Anthropic silently downgraded Claude’s default thinking intensity from high to medium, resulting in a 73% reduction in reasoning depth. This post breaks down what happened, why it happened, and how API users can verify they’ve been restored to full-strength thinking mode after April 7. What Happened Between February and March 2026, Anthropic quietly made three undisclosed configuration changes to Claude: Feb 9— Claude switched to adaptive reasoning depth, letting the model decide how much to think per task rather than using a fixed budget Feb 12 — Intermediate thinking steps were hidden in the UI to reduce perceived latency Mar 3 — Default effort level was silently downgraded from high to medium (level 85) None of these changes were announced prominently. Developers started noticing Claude Code felt increasingly sluggish and unreliable — but with no changelog to reference, most could only post on GitHub, Reddit, and X asking “Is it something I’m doing wrong?” !Anthropic’s 3 undisclosed configuration changes to Claude The Numbers: How Bad Was the Drop? What turned this into a major story was a systematic analysis by Stella Laurenzo, Senior Principal Engineer at AMD AI — she ran an engineering-grade diagnostic across 6,852 sessions, 17,871 thinking blocks, and 234,760 tool calls: CLAUDE CODE · Performance Comparison Claude Code Reasoning Depth Down 73%: January vs. March Data source: AMD AI Senior Principal Engineer Stella Laurenzo — 6,852 sessions · 17,871 thinking blocks · 234,760 tool calls Metric Jan (Baseline) Mar (After Effort Downgrade) Change Median visible thinking length (median token count per thinking block) 2,200 chars 600 chars -73% Files read before editing (avg. files scanned before modifying code) Baseline Up to +80× ↑ Files read before editing (avg. files scanned before modifying code) 6.6 个 2.0 个 -70% The drop in files read before editing — from 6.6 down to 2.0 — is particularly telling. Claude Code was editing code without properly understanding the dependency graph first, leading directly to more errors and rework cycles. Why Did Anthropic Do This? Boris Cherny, the product lead for Claude Code, offered a public explanation: “We lowered the default effort to medium because we were getting user feedback that Claude was consuming too many tokens.” In other words: to save tokens and reduce latency, reasoning quality was sacrificed — without giving users a choice, and without a clear public announcem...
Anthropic faces backlash over account deactivations, Claude performance ...
Anthropic is facing criticism after abruptly deactivating over 60 accounts and reported performance decline of their AI, Claude.
[BUG] Opus 4.7 Hallucinations · Issue #50235 · anthropics/claude-code
CLAUDE.md files at global, project, and agent levels all contain explicit "search when uncertain" instructions — none prevented the failure This aligns with the broader "assumes based on thin information" pattern described in the original issue, but the specific case — failing on Claude Code's own command surface — suggests the tool-use ...
