Fact · Voice and AI
1.8percent
On the Vectara leaderboard updated September 22, 2026, the lowest hallucination rate in the table is 1.8 percent, for the antgroup/finix_s1_32b model.
Checked against its source on October 17, 2026
In the source's own words
“antgroup/finix_s1_32b|1.8 %|98.2 %|99.5 %|172.4”
Vectara Hallucination Leaderboard: LLM hallucination rates when summarizing a document, Vectara, Vectara, GitHub, 2026, Leaderboard table, first row.
Open the original- What it measures
- The table lists each model's hallucination rate, factual consistency rate, answer rate and average summary length in words.
- What it does not show
- A single-model open-weight entry on one dataset. Rates change as models are updated, so this is a snapshot from the September 2026 table.