Input and output — CCA-F Exam Prep

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REAL STORY A person holding their phone, speaking to Siri. A speech bubble says 'What's the weather?' A response bubble from the phone says '72 degrees and sunny.' Minimal, clean illustration on white background.

A person holding their phone, speaking to Siri. A speech bubble says 'What's the weather?' A response bubble from the phone says '72 degrees and sunny.' Minimal, clean illustration on white background.

A company built a Claude-powered support bot. They wrote a great system prompt in English. Tested it in English. Deployed it. Then a customer wrote in Spanish.

The system prompt never mentioned other languages. The bot's response came back as a confused mix of English and Spanish -- half-translated, fully wrong. The customer screenshot went viral on Twitter. 200,000 views in 12 hours.