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vectara
hallucination-leaderboard
Python2023–2025
vectara / hallucination-leaderboard

hallucination-leaderboard

Leaderboard Comparing LLM Performance at Producing Hallucinations when Summarizing Short Documents

AI & Machine LearningProductivity
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11Distinct people
26Mentions
0Explicit recommenders
3.3KGitHub stars
REPOSITORY AT A GLANCE

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What it is

Leaderboard Comparing LLM Performance at Producing Hallucinations when Summarizing Short Documents

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

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Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by month26 dated mentions

Observed mentions: 2023-11-06 19:11:51 UTC to 2025-12-18 16:18:15 UTC.

02462023-11-01 00:00:00 UTC to 2023-12-01 00:00:00 UTC (exclusive): 7 mentions; 2 submissions, 5 commentsNov 20232023-12-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-01-01 00:00:00 UTC to 2024-02-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-02-01 00:00:00 UTC to 2024-03-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-03-01 00:00:00 UTC to 2024-04-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-04-01 00:00:00 UTC to 2024-05-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2024-05-01 00:00:00 UTC to 2024-06-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-06-01 00:00:00 UTC to 2024-07-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2024-07-01 00:00:00 UTC to 2024-08-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-08-01 00:00:00 UTC to 2024-09-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-09-01 00:00:00 UTC to 2024-10-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2024-10-01 00:00:00 UTC to 2024-11-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2024-11-01 00:00:00 UTC to 2024-12-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 commentsNov 20242024-12-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-01-01 00:00:00 UTC to 2025-02-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2025-02-01 00:00:00 UTC to 2025-03-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-03-01 00:00:00 UTC to 2025-04-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments2025-04-01 00:00:00 UTC to 2025-05-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-05-01 00:00:00 UTC to 2025-06-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2025-06-01 00:00:00 UTC to 2025-07-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2025-07-01 00:00:00 UTC to 2025-08-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2025-08-01 00:00:00 UTC to 2025-09-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-09-01 00:00:00 UTC to 2025-10-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-10-01 00:00:00 UTC to 2025-11-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-11-01 00:00:00 UTC to 2025-12-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-12-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 commentsDec 2025

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
Nov 20232023-11-01 00:00:00 UTC2023-12-01 00:00:00 UTC725
Dec 20232023-12-01 00:00:00 UTC2024-01-01 00:00:00 UTC000
Jan 20242024-01-01 00:00:00 UTC2024-02-01 00:00:00 UTC000
Feb 20242024-02-01 00:00:00 UTC2024-03-01 00:00:00 UTC000
Mar 20242024-03-01 00:00:00 UTC2024-04-01 00:00:00 UTC000
Apr 20242024-04-01 00:00:00 UTC2024-05-01 00:00:00 UTC101
May 20242024-05-01 00:00:00 UTC2024-06-01 00:00:00 UTC000
Jun 20242024-06-01 00:00:00 UTC2024-07-01 00:00:00 UTC101
Jul 20242024-07-01 00:00:00 UTC2024-08-01 00:00:00 UTC000
Aug 20242024-08-01 00:00:00 UTC2024-09-01 00:00:00 UTC000
Sep 20242024-09-01 00:00:00 UTC2024-10-01 00:00:00 UTC202
Oct 20242024-10-01 00:00:00 UTC2024-11-01 00:00:00 UTC101
Nov 20242024-11-01 00:00:00 UTC2024-12-01 00:00:00 UTC000
Dec 20242024-12-01 00:00:00 UTC2025-01-01 00:00:00 UTC101
Jan 20252025-01-01 00:00:00 UTC2025-02-01 00:00:00 UTC000
Feb 20252025-02-01 00:00:00 UTC2025-03-01 00:00:00 UTC101
Mar 20252025-03-01 00:00:00 UTC2025-04-01 00:00:00 UTC211
Apr 20252025-04-01 00:00:00 UTC2025-05-01 00:00:00 UTC101
May 20252025-05-01 00:00:00 UTC2025-06-01 00:00:00 UTC202
Jun 20252025-06-01 00:00:00 UTC2025-07-01 00:00:00 UTC000
Jul 20252025-07-01 00:00:00 UTC2025-08-01 00:00:00 UTC000
Aug 20252025-08-01 00:00:00 UTC2025-09-01 00:00:00 UTC101
Sep 20252025-09-01 00:00:00 UTC2025-10-01 00:00:00 UTC101
Oct 20252025-10-01 00:00:00 UTC2025-11-01 00:00:00 UTC101
Nov 20252025-11-01 00:00:00 UTC2025-12-01 00:00:00 UTC101
Dec 20252025-12-01 00:00:00 UTC2026-01-01 00:00:00 UTC303

What Hacker News says

26 sources
logicprog·Aug 13, 2025
I'm really confused by your experience to be honest. I by no means believe that LLMs can reason, or will replace any human beings any time soon, or any of that nonsense (I think all that is cooked up by CEOs and C-suite to justify layoffs and devalue labor) and I'm very much on the side that's ready for the AI hype bubble to pop, but also terrified by how big it is, but at the same time, I experience LLMs as infinitely more competent and useful than you seem to, to the point that it feels like we're living in different realities. I regularly use LLMs to change the tone of passages of text, or make them more concise, or reformat them into bullet points, or turn them into markdown, and so on, and I only have to tell them once, alongside the content, and they do an admirably competent job — I've almost never (maybe once that I can recall) se
Read the rest
en them add spurious details or anything, which is in line with most benchmarks I've seen (https://github.com/vectara/hallucination-leaderboard), and they always execute on such simple text-transformation commands first-time, and usually I can paste in further stuff for them to manipulate without explanation and they'll apply the same transformation, so like, the complete opposite of your multiple-prompts-to-get-one-result experience. It's to the point where I sometimes use local LLMs as a replacement for regex, because they're so consistent and accurate at basic text transformations, and more powerful in some ways for me. They're also regularly able to one-shot fairly complex jq commands for me, or even infer the jq commands I need just from reading the TypeScript schemas that describe the JSON an API endpoint will produce, and so on, I don't have to prompt multiple times or anything, and they don't hallucinate. I'm regularly able to have them one-shot simple Python programs with no hallucinations at all, that do close enough to what I want that it takes adjusting a few constants here and there, or asking them to add a feature or two. > And then the broken tape recorder mode! Oh god! I don't even know what you mean by this, to be honest. I'm really not trying to play the "you're holding it wrong / use a bigger model / etc" card, but I'm really confused; I feel like I see comments like yours regularly, and it makes me feel like I'm legitimately going crazy.
In Training language models to be warm and empathetic makes them less reliable
hnhn34·May 11, 2025
> Whatever people say about AI, they're incapable of doing quality investigative reporting any time soon the latest Gemini models have a very low hallucination rate in benchmarks [0]. Feel free to try it yourself. Just go to gemini.google.com, choose Deep Research, and ask it to write a report about a topic that you're intimately familiar with. [0] - https://github.com/vectara/hallucination-leaderboard
In Update turns Google Gemini into a prude, breaking apps for trauma survivors
Nauxuron·May 11, 2025
> 4.5/o3 doesn't seem hugely more intelligent then 3.0 -- it hallucinates less [...] This is not entirely true, or at least the trend is not necessarily less hallucination. See section 3.3 in the OpenAI o3 and o4-mini System Card[1], which shows that o3 and o4-mini both hallucinate more than o1. See also [2] for more data on hallucinations. [1]: https://openai.com/index/o3-o4-mini-system-card/ [2]: https://github.com/vectara/hallucination-leaderboard/
In In 2025, venture capital can't pretend everything is fine any more

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