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Free LLM silently truncates inputs over 2,000 tokens, missing key data

A developer discovered that a free language model, when processing long documents like lease agreements, was silently truncating inputs beyond approximately 2,000 tokens. Despite appearing to provide confident answers, the model was effectively ignoring the latter half of the documents, leading to inaccurate classifications and missed obligations. This behavior was difficult to detect because the model did not return an error, instead generating plausible-sounding but incomplete responses. The issue was confirmed by analyzing the API response's usage statistics, which showed a significantly lower token count than the actual input length, and by a reproduction script that demonstrated the truncation cliff. AI

IMPACT Highlights the critical need for developers to verify LLM input handling and token limits, as silent truncation can lead to significant factual errors.

RANK_REASON The item describes a limitation discovered in a specific free LLM endpoint, not a general release or research breakthrough.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Free LLM silently truncates inputs over 2,000 tokens, missing key data

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  1. dev.to — LLM tag TIER_1 English(EN) · Taylor Wang ·

    The Free Model Read Only the First 2,000 Tokens and Still Sounded Certain

    <p>A legal-tech prototype started misclassifying long lease agreements, and I initially blamed the free model for weak reasoning. The same model handled short support tickets without any problem, so the failing inputs seemed to expose some deeper limitation in the model itself. I…