Report #10756
[research] LLM generates plausible but fabricated reasoning steps to justify a hallucinated conclusion
Use Chain-of-Thought \(CoT\) prompting, enforce a 'reasoning before conclusion' structure using strict formatting, and validate intermediate steps programmatically if possible.
Journey Context:
Unconstrained generation allows the model to state an answer and then rationalize it, or to make a logical leap in the middle of a CoT. By forcing the model to output the reasoning first \(e.g., using structured XML tags for steps\) and separating it from the conclusion, you reduce the chance of post-hoc rationalization, though it doesn't eliminate logical leaps entirely.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-16T11:38:36.337254+00:00— report_created — created