Models
Anthropic
How Claude Models Write Language Markers

@arenaX · Sep 25, 2026

How Claude Models Write Language Markers

@arena's small multiples drew 1.5M views on X: 33x its median post and #77 of 1,162 AI chart posts we hold by views. Read Oct 13, 2026.

XData Small multiples Claude Opus 5 All Anthropic modelsFable 5Opus 5Opus 4.6Fable 5.1Opus 4.7Opus 4.8Opus 5.5

@arena: How Claude Models Write Language Markers — Published by @arena on X, Sep 25, 2026. Source: x.com

68/ 100

ViralChart score

Wide but thin

More views than the median post but a lower engagement rate: many saw it, few acted. Common for big accounts.

#271 of 1,162 AI chart posts we hold · #37 of 239 @arena 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 Wide but thin quadrant, at #271 of 1,162 AI chart posts.

Its 1.5M views sit 33x above @arena's median post, at #8 of 239 @arena posts.

Engagement lands at 0.16%, the 3rd percentile among AI chart posts and #1,125 of 1,162.

At 6.44 views per follower, it reaches the 94th percentile across posts with known followers.

33x@arena's median post

1.5M views, where @arena's typical post gets 46.2K.

56xthe median small multiples post

Across 43 small multiples posts we hold, the median gets 27K views.

6.44views per follower

1.5M views from an account with 234.1K followers.

3charts in this one post

The numbers belong to the post, so every chart in it shares them and it is ranked once.

Public X numbers from our read on Oct 13, 2026. Peers: 1,162 AI chart posts we hold and 239 from @arena.

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 #271 of 1,162

Views	1.5M	#77	top 7%
Likes	2.1K	#144	top 12%
Engagement rate	0.16%	#1,125	bottom 3%
Save rate	0.050%	#826	bottom 29%

Among 239 @arena posts

Score #37 of 239

Views	1.5M	#8	top 3%
Likes	2.1K	#16	top 6%
Engagement rate	0.16%	#231	bottom 4%
Save rate	0.050%	#188	bottom 22%

Growth

Our reads cover 27 hours

Views1.5M

Age at our read18 days

Views per day of life83.5Kviews divided by days since it was posted

Gained between our reads+175views over 27 hours, about 155 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.

@arena'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 · Sep 25, 2026

@arena charts how Claude models write language markers

A 3-chart small multiples post on Claude language markers drew 1.5M views against a 0.16% engagement rate.

What happened

@arena posted a small multiples chart on how Claude models write language markers on September 25, 2026. It came with 3 other posts from the account that day, including Agent Arena Leaderboard Rankings at 152K views.

The numbers

The post reached 1.5M views, #77 of 1,162 AI chart posts, against a median of 39.9K. Its score of 68 ranks #271 of 1,162 AI chart posts and #37 of 239 @arena posts.

The lesson

At 3 charts in one post, the format drew 1.5M views but a 0.16% engagement rate, the 3rd percentile among AI chart posts. The chart shows em dashes (Fable 5) at 16.3 and em dashes (Opus 4.8) at 11.2.

What it means

At #37 of 239 @arena posts by score, this post trails the account's own 0.68% median engagement rate. The 1.5M views against a 0.16% rate leave a wide but thin result.

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

Updates: what @arena posted next

Data and API

28 points read off this chart

Estimated from the image 92%

Series	Group	Value	Read
Em dashes	Fable 5	16.3 per 1,000 words / % of answers	printed
Em dashes	Opus 5	15.2 per 1,000 words / % of answers	printed
Em dashes	Opus 4.6	14.5 per 1,000 words / % of answers	printed
Em dashes	Opus 4.7	12.6 per 1,000 words / % of answers	printed
Em dashes	Fable 5.1	11.3 per 1,000 words / % of answers	printed
Em dashes	Opus 4.8	11.2 per 1,000 words / % of answers	printed
Em dashes	Opus 5.5	0.8 per 1,000 words / % of answers	printed
Semicolons	Fable 5.1	6.31 per 1,000 words / % of answers	printed
Semicolons	Opus 5	6.1 per 1,000 words / % of answers	estimated
Semicolons	Fable 5	3.04 per 1,000 words / % of answers	estimated
Semicolons	Opus 4.6	1.72 per 1,000 words / % of answers	printed
Semicolons	Opus 4.7	1.64 per 1,000 words / % of answers	printed

Showing 12 of 28. All points, the redraw and the maker

Max plan · API

GET https://viral-chart.com/api/posts/c1fbfe68a7dc.json
GET https://viral-chart.com/api/charts/c1fbfe68a7dc.json
GET https://viral-chart.com/api/charts/c1fbfe68a7dc.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 c1fbfe68a7dc.

See the Max plan API docs

	Path	Returns	Plan
GET	`/api/v1/charts/c1fbfe68a7dc`	Title, publisher, date, form, point count; with a Max key, the data link	Open
GET	`/api/v1/charts/c1fbfe68a7dc/data`	Every point with its provenance and confidence, plus the redraw spec. Add ?format=csv for CSV	Max
GET	`/api/v1/charts/c1fbfe68a7dc/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/c1fbfe68a7dc/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.

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