Write Like It's 1866: LLMs Relearn Telegraphese

Automated excerpt

A model receives one presentation — the full passage, a plaintext record, a cablese record, or a decoded record — and answers each question in a few words. Every comparison in this post holds the questions and grader constant and changes only what the model gets to read. Why isn’t the plaintext baseline 100%? Answering questions about an uncompressed passage in plaintext scores ~91%.

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