LLM Logic Test: Minor Value Change Causes Silent Output Failure in OpenAI Models
rayanpal_ · reddit · 2026-08-28
A Reddit user shared a test revealing a conditional logic failure in LLMs. The rule was simple: if risk < 0.0100, output "RELEASE".
Results:
- In 8 runs across GPT-5.4 and GPT-5.6 Sol, cases where the condition failed (0.0100 -> 0 bytes) produced zero visible output (silence), while passing cases (0.0099) correctly output "RELEASE".
- Removing the system prompt caused the failing cases to output refusals (e.g., "DENY").
Significance: The author argues this tests whether a model can stop generation at a specific condition, not just refuse. When the value equals the threshold, the model appears to fall into a silent state rather than responding. The code is public and verifiable.
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