Governance, Security & Trust

AI Hallucination

AMAdil Mektoub

Publié le 13 July 2026Dernière révision 13 July 2026

Définition

AI Hallucination: is a confident but false or unsupported output produced by a language model — plausible-sounding text that is not grounded in fact — which is why enterprise AI must combine grounding, guardrails and human oversight.

Synthèse pour dirigeants

Synthèse pour dirigeants

Language models generate the most likely next words, not verified truth. When they lack grounding, they can produce fluent, confident statements that are simply wrong. This is inherent to how the technology works, not a bug to be fully patched.

Hallucination is managed, not eliminated: grounding answers in a Knowledge Base through RAG, constraining behaviour with guardrails, and keeping humans in the loop for consequential decisions all reduce its frequency and impact.

Points clés

Points clés
  • A hallucination is a confident but unsupported AI output.
  • It stems from how language models generate text.
  • Grounding with RAG substantially reduces it.
  • It is managed with oversight, not fully eliminated.

Architecture

Mitigation combines several layers:

  1. 1GroundingRetrieval from a knowledge base anchors answers in real content.
  2. 2ConstraintsGuardrails and prompts limit speculation and require sourcing.
  3. 3VerificationChecks and citations make answers auditable.
  4. 4Human oversightPeople validate consequential outputs before action.

Exemple concret

Exemple de scénario de mise en œuvre

Asked about a contract clause without access to the document, a model might invent a plausible answer.

Grounded against the actual document through retrieval, it instead cites the real clause — or states it cannot find one.

FAQ

Questions fréquentes

Can AI hallucination be eliminated completely?
No. It can be substantially reduced through grounding, guardrails and verification, but not eliminated. This is why human oversight is retained for consequential decisions.
Does retrieval-augmented generation stop hallucination?
RAG greatly reduces it by grounding answers in real content, but a model can still misread or over-extend retrieved information, so oversight remains important.
AM

Auteur

Adil Mektoub

Cofondateur · Ingénierie & infrastructure IA

Ingénieur DevOps, plateforme et systèmes IA, spécialisé dans les infrastructures d’IA agentique sécurisées et évolutives.