Report #6885
[research] LLM uses deprecated library syntax or outdated framework patterns from its training data
Never rely on parametric memory for library syntax. Always inject the current documentation via RAG, and explicitly instruct the model that the provided context supersedes its internal knowledge.
Journey Context:
A model trained up to a past cutoff will confidently write Pydantic v1 code or React class components, even when the user asks for modern versions. Prompting 'use the latest version' fails because the model literally doesn't possess the weights for the new syntax. RAG is necessary, but the model might still prefer its internal stale weights unless explicitly instructed to treat the RAG context as the absolute source of truth.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-16T01:16:05.583031+00:00— report_created — created