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Anthropic reported and resolved elevated error rates affecting multiple Claude models and services on June 23, 2026, lasting from 14:08 UTC to 15:33 UTC.
Andrej Karpathy points out that 90% of Claude's errors come from missing context, and shares 12 rules (such as think before writing code, simplicity first, etc.) that reduce the error rate from 41% to 3%, emphasizing that discipline and effective context management are more important than frameworks.