The anthropic/claude-haiku-4-5-20251001 model achieved a hallucination rate of 9.8%, a factual consistency rate of 90.2%, an answer rate of 99.5%, and an average summary length of 115.1 words as of March 20, 2026.

Authors

• Person: Not available Organization: Vectara
  vectara/hallucination-leaderboard - GitHub

Sources

• vectara/hallucination-leaderboard - GitHub github.com Vectara via serper

Referenced by nodes (4)

• hallucination rate concept
• answer rate concept
• factual consistency rate concept
• average summary length concept