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Hallucination Rate and FActScore Comparison

xAIX · Nov 17, 2025 · official

Hallucination Rate and FActScore Comparison

xAI's benchmark bar chart drew 143.5K views on X: 1.1x its median post and #324 of 1,162 AI chart posts we hold by views. Read Oct 13, 2026.

Hallucination and FActScore comparison for Grok models

XData Benchmark bar chart Grok 4 All xAI modelsGrok 4 Fast (Non-Reasoning)Grok 4.1 (Non-Reasoning)

xAI: Hallucination Rate and FActScore Comparison — Published by xAI on X, Nov 17, 2025. Source: x.com

68/ 100

ViralChart score

Reached and resonated

More views and a higher engagement rate than the median post: it travelled and people acted on it.

#267 of 1,162 AI chart posts we hold · #8 of 23 xAI posts. Score = views 40%, likes 30%, engagement rate 15%, save rate 15%, each as a percentile of every AI chart post we hold.

Our read

The post sits in the Reached and resonated quadrant at #267 of 1,162 AI chart posts.

Its 0.040% save rate sits at the 22nd percentile among AI chart posts, below the 0.076% median.

A score of 68 puts it at #267 of 1,162 AI chart posts and #8 of 23 xAI posts.

It was #4 of 5 xAI posts by views that day, level with the account's launch-day pattern.

5posts from xAI that day

Part of a run of 5 posts on Nov 17, 2025. This one was #4 of 5 by views that day.

bottom 22%save rate

0.040% of viewers bookmarked it to come back to. The median post gets 0.076%.

3.2xthe median benchmark bar chart post

Across 215 benchmark bar chart posts we hold, the median gets 44.4K views.

top 25%engagement rate

1.03% of viewers liked, reposted, quoted or replied. The median post gets 0.73%.

Public X numbers from our read on Oct 13, 2026. Peers: 1,162 AI chart posts we hold and 23 from xAI.

Where it sits

Reach against resonance

Each dot is a post. Right is more views, up is a higher engagement rate. The lines are the medians, so the four corners are the four kinds of post.

Among 1,162 AI chart posts we hold

Score #267 of 1,162

Views	143.5K	#324	top 28%
Likes	1.3K	#220	top 19%
Engagement rate	1.03%	#294	top 25%
Save rate	0.040%	#912	bottom 22%

Among 23 xAI posts

Score #8 of 23

Views	143.5K	#11	top 46%
Likes	1.3K	#11	top 46%
Engagement rate	1.03%	#7	top 28%
Save rate	0.040%	#14	bottom 41%

Growth

Our reads cover 23 hours

Views143.5K

Age at our read330 days

Views per day of life435views divided by days since it was posted

Gained between our reads+2views over 23 hours, about 2 a day now

Dots are our reads. The dotted line from the day it was posted to our first read is a gap, not data.

xAI's posts over time

Every post from this account we hold, by date and views. This one is marked; the line is the running median of the last 10.

News · Nov 17, 2025

xAI posts Grok hallucination and FActScore benchmark chart

The chart shows Grok 4.1 (Non-Reasoning) at 4.22% hallucination rate and 2.97% FActScore.

What happened

xAI published a benchmark bar chart on November 17, 2025, comparing hallucination rate and FActScore for Grok models. It was one of 5 xAI posts that day, alongside posts on LM Arena Text Leaderboard, Creative Writing v3 - Elo (Normalized), and EQ-Bench Emotional Intelligence Benchmark.

The numbers

The post reached 144K views, ranking #324 of 1,162 AI chart posts, against a median of 39.9K views among AI chart posts. Its score of 68 ranks #267 of 1,162 AI chart posts and #8 of 23 xAI posts.

The lesson

A 0.040% save rate at the 22nd percentile among AI chart posts shows this benchmark bar chart was saved less than the 0.076% median. For chart makers, the save rate is the gap here, not the view count.

What it means

At #8 of 23 xAI posts by score, this chart sits in the top third of the account's output. The 0.040% save rate against the 0.076% median among AI chart posts marks a gap between reach and keeping.

Written by ViralChart from public numbers read on Oct 13, 2026. Every number is checked against our data before it is shown.

Updates: what xAI posted next

Data and API

4 points read off this chart

Estimated from the image 97%

Series	Group	Value	Read
Grok 4 Fast (Non-Reasoning)	Hallucination Rate	12.09 %	printed
Grok 4.1 (Non-Reasoning)	Hallucination Rate	4.22 %	printed
Grok 4 Fast (Non-Reasoning)	FActScore	9.89 %	printed
Grok 4.1 (Non-Reasoning)	FActScore	2.97 %	printed

Max plan · API

GET https://viral-chart.com/api/posts/0bb2adfdcb95.json
GET https://viral-chart.com/api/charts/0bb2adfdcb95.json
GET https://viral-chart.com/api/charts/0bb2adfdcb95.skill.md

Make one like this Open the post JSON Chart data JSON Skill file API docs

Static files in this prototype. The post JSON holds the public numbers, ranks, score, quadrant, our reads and, when checked, our copy.

API · Max

Use this chart via API

On the Max plan you can pull this chart's numbers with the provenance of each one, as JSON or CSV, with its redraw spec, or call it from an agent over MCP. Chart id 0bb2adfdcb95.

See the Max plan API docs

	Path	Returns	Plan
GET	`/api/v1/charts/0bb2adfdcb95`	Title, publisher, date, form, point count; with a Max key, the data link	Open
GET	`/api/v1/charts/0bb2adfdcb95/data`	Every point with its provenance and confidence, plus the redraw spec. Add ?format=csv for CSV	Max
GET	`/api/v1/charts/0bb2adfdcb95/render?view=1`	The draw-only view this page uses	Open
POST	`/mcp`	Tool get_chart_data with this id, for Claude, Cursor and other agents	Max

curlMax

curl -s https://viral-chart.com/api/v1/charts/0bb2adfdcb95/data \
  -H "Authorization: Bearer $VIRALCHART_KEY"

Claude CodeMax

claude mcp add --transport http viralchart https://viral-chart.com/mcp \
  --header "Authorization: Bearer $VIRALCHART_KEY"

60 requests a minute per key; over that you get 429 with Retry-After. Up to 5 keys per account, made on your account page and shown once. Without Max, the data route answers 402 with a link to the plans. The numbers describe a chart its publisher owns, and every file carries a license note.