FIX: Default prompts have to be explicit about the expected format. #34442
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Wrapping the expected response with `<output>` tags confuses models, especially those from the Claude family, which don't have schema support and rely on prefilling. Relying on prefilling means they only know the response must start with `{`, and how the JSON looks is only hinted at in the system prompt.
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nattsw
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Aug 20, 2025
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This pull request has been mentioned on Discourse Meta. There might be relevant details there: https://meta.discourse.org/t/ai-spam-bot-says-it-is-not-spam-but-scan-log-says-it-is-spam/379375/5 |
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This pull request has been mentioned on Discourse Meta. There might be relevant details there: https://meta.discourse.org/t/daily-summary-5am-utc/291851/569 |
yuriyaran
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Aug 21, 2025
…34442) Wrapping the expected response with `<output>` tags confuses models, especially those from the Claude family, which don't have schema support and rely on prefilling. Relying on prefilling means they only know the response must start with `{`, and how the JSON looks is only hinted at in the system prompt.
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Wrapping the expected response with
<output>tags confuses models, especially those from the Claude family, which don't have schema support and rely on prefilling. Relying on prefilling means they only know the response must start with{, and how the JSON looks is only hinted at in the system prompt.