Specifying LLM Output Length

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When asking LLM to generate a summary with a word limit, I found that they frequently go over the limit. Is there a way to effectively cap the output length without abrupt endings or hard cutoffs?

LLM behavior Implemented:https://github.com/Hypogenic-AI/llm-output-length-claude Implemented:https://github.com/Hypogenic-AI/llm-output-length-codex Implemented:https://github.com/Hypogenic-AI/llm-output-length-gemini

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If you are inspired by this idea, you can reach out to the authors for collaboration or cite it:

@misc{lu-specifying-llm-output-2026,
  author = {Lu, Lawrence},
  title = {Specifying LLM Output Length},
  year = {2026},
  url = {https://hypogenic.ai/ideahub/idea/LHIvMvOImSY87Ve1sHwC}
}

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