Gate News message, April 24 — Anthropic has acknowledged a recent decline in Claude Code quality and confirmed that all related issues have been resolved through rollbacks and fixes. The problems stemmed from three product and prompt adjustments made between early and mid-April.
On March 4, the default reasoning effort was reduced from high to medium, which degraded performance until it was restored to high/xhigh on April 7. On March 26, a bug was introduced in the clear_thinking_20251015 logic designed to optimize caching, causing the system to lose reasoning history during extended idle periods and leading to memory loss and repetition; this was fixed in version 2.1.101 on April 10. Most recently, on April 16, a system prompt was added to compress output (limiting responses to ≤25/100 words), which resulted in approximately 3% negative impact on code quality; this change was rolled back on April 20.
Anthropric stated that the API reasoning layer was not affected by these issues. The company has also reset usage quotas for all subscribers.
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