Models
Anthropic
How Claude Models Write Language Markers

@arenaX · Sep 9, 2026

How Claude Models Write Language Markers

@arena's benchmark bar chart drew 55.6K views on X: 1.2x its median post and #508 of 1,162 AI chart posts we hold by views. Read Oct 12, 2026.

XData Benchmark bar chart Claude Fable 5 All Anthropic modelsOpus 4.5Opus 4.6Opus 4.7Opus 5Opus 5.1Fable 5

@arena: How Claude Models Write Language Markers — Published by @arena on X, Sep 9, 2026. Source: x.com

65/ 100

ViralChart score

Reached and resonated

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

#346 of 1,162 AI chart posts we hold · #52 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

It sits in the Reached and resonated quadrant at #346 of 1,162 AI chart posts.

A 0.20% save rate lands at the 90th percentile among AI chart posts, against a 0.076% median.

The post carries 3 charts, and every chart in the post shares the post's numbers.

A score of 65 puts it at #346 of 1,162 AI chart posts and #52 of 239 @arena posts.

3charts in this one post

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

top 10%save rate

0.196% of viewers bookmarked it to come back to. The median post gets 0.076%.

0.24views per follower

55.6K views from an account with 234.1K followers.

top 29%engagement rate

0.97% of viewers liked, reposted, quoted or replied. The median post gets 0.73%.

Public X numbers from our read on Oct 12, 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 #346 of 1,162

Views	55.6K	#508	top 44%
Likes	467	#460	top 40%
Engagement rate	0.97%	#335	top 29%
Save rate	0.196%	#120	top 10%

Among 239 @arena posts

Score #52 of 239

Views	55.6K	#107	top 45%
Likes	467	#91	top 38%
Engagement rate	0.97%	#50	top 21%
Save rate	0.196%	#10	top 4%

Growth

One read so far

Views55.6K

Age at our read33 days

Views per day of life1.7Kviews divided by days since it was posted

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 9, 2026

@arena charts how Claude models write language markers

A benchmark bar chart on Claude language markers drew 55.6K views and a 0.20% save rate, the 90th percentile among AI chart posts.

What happened

@arena posted a benchmark bar chart on how Claude models write language markers on September 9, 2026, with 3 charts in the post. It was the account's only post that day.

The numbers

It reached 55.6K views, #508 of 1,162 AI chart posts, against a 39.9K median among AI chart posts. Its score of 65 ranks #346 of 1,162 AI chart posts and #52 of 239 @arena posts.

The lesson

A 0.20% save rate, the 90th percentile among AI chart posts, came with 3 charts in one post. The chart shows printed values such as em dashes (Opus 4.5): 6.8 and honesty wording (Opus 4.6): 0.41.

What it means

At #52 of 239 @arena posts, this chart sits above the account's own middle. Its 0.20% save rate against the 0.076% median among AI chart posts is the gap that separates it from the pack.

Written by ViralChart from public numbers read on Oct 12, 2026. Every number is checked against our data before it is shown.

Updates: what @arena posted next

Data and API

29 points read off this chart

Estimated from the image 69%

Series	Group	Value	Read
Em dashes (-)	Opus 4.5	6.8 per 1,000 words	printed
Em dashes (-)	Opus 4.6	14.2 per 1,000 words	estimated
Em dashes (-)	Opus 4.7	12.7 per 1,000 words	estimated
Em dashes (-)	Opus 4.8	12.4 per 1,000 words	printed
Em dashes (-)	Opus 5	14.8 per 1,000 words	estimated
Em dashes (-)	Fable 5	16.2 per 1,000 words	estimated
Em dashes (-)	Fable 5.1	11 per 1,000 words	estimated
Semicolons (;)	Opus 4.5	1.3 per 1,000 words	printed
Semicolons (;)	Opus 4.6	1.91 per 1,000 words	estimated
Semicolons (;)	Opus 4.7	2.37 per 1,000 words	estimated
Semicolons (;)	Opus 4.8	2.53 per 1,000 words	estimated
Semicolons (;)	Opus 5	3.73 per 1,000 words	estimated

Showing 12 of 29. All points, the redraw and the maker

Max plan · API

GET https://viral-chart.com/api/posts/4cc30b38be92.json
GET https://viral-chart.com/api/charts/4cc30b38be92.json
GET https://viral-chart.com/api/charts/4cc30b38be92.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 4cc30b38be92.

See the Max plan API docs

	Path	Returns	Plan
GET	`/api/v1/charts/4cc30b38be92`	Title, publisher, date, form, point count; with a Max key, the data link	Open
GET	`/api/v1/charts/4cc30b38be92/data`	Every point with its provenance and confidence, plus the redraw spec. Add ?format=csv for CSV	Max
GET	`/api/v1/charts/4cc30b38be92/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/4cc30b38be92/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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