Anthropic Confirms Claude Code Quality Declined for Weeks

4 articles • Started 6 months ago • Last updated 6 months ago

Anthropic confirmed April 23 that Claude's code generation quality declined significantly over several weeks while the company attempted to improve the model's capabilities. Engineering missteps during the upgrade process inadvertently degraded performance, the company acknowledged following user complaints. Anthropic attributed the month-long quality decline to internal mistakes and committed to implementing stricter quality control measures to prevent similar issues. The admission came after weeks of public backlash over the coding tool's deteriorated output.

Thursday, April 23, 2026

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An update on recent Claude Code quality reports Simon Willison's Weblog •

Friday, April 24, 2026