Models
Anthropic
Claude Opus 5.5 (High) Rank #2 & Pareto

@arenaX · Sep 28, 2026

Claude Opus 5.5 (High) Rank #2 & Pareto

@arena's benchmark bar chart drew 64.3K views on X: 1.4x its median post and #471 of 1,162 AI chart posts we hold by views. Read Oct 12, 2026.

Claude Opus 5.5 ranks #2 in Agent Arena cost per task

XData Benchmark bar chart Claude Opus 5 All Anthropic modelsClaude Opus 5.5 (High)Claude Fable 5.1 (Max)GPT 5 Astra (Max)Claude Opus 5 (Max)GPT 5 Sol (Max)Claude Opus 4.8 (High)GPT 5 Sol (xHigh)Claude Sonnet 5 (High)

@arena: Claude Opus 5.5 (High) Rank #2 & Pareto — Published by @arena on X, Sep 28, 2026. Source: x.com

64/ 100

ViralChart score

Reached and resonated

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

#369 of 1,162 AI chart posts we hold · #60 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 #369 of 1,162 AI chart posts.

Its 64.3K views sit above the 39.9K median among AI chart posts, and the post ranked #3 of 5 from @arena that day.

The 0.12% save rate lands at the 70th percentile among AI chart posts, against a 0.076% median.

A score of 64 puts it at #369 of 1,162 AI chart posts and #60 of 239 @arena posts.

5posts from @arena that day

Part of a run of 5 posts on Sep 28, 2026. This one was #3 of 5 by views that day.

0.27views per follower

64.3K views from an account with 234.1K followers.

top 30%save rate

0.115% of viewers bookmarked it to come back to. The median post gets 0.076%.

top 31%engagement rate

0.95% 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 #369 of 1,162

Views	64.3K	#471	top 40%
Likes	549	#424	top 36%
Engagement rate	0.95%	#355	top 31%
Save rate	0.115%	#353	top 30%

Among 239 @arena posts

Score #60 of 239

Views	64.3K	#99	top 41%
Likes	549	#81	top 34%
Engagement rate	0.95%	#57	top 24%
Save rate	0.115%	#56	top 23%

Growth

One read so far

Views64.3K

Age at our read14 days

Views per day of life4.5Kviews 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 28, 2026

@arena charts Claude Opus 5.5 cost per task

A benchmark bar chart on Claude Opus 5.5 cost per task drew 64.3K views and a 0.12% save rate.

What happened

@arena posted a benchmark bar chart on September 28, 2026, covering Claude Opus 5.5 (High) cost per task. It was one of 5 posts from the account that day, alongside 4 others.

The numbers

It reached 64.3K views, ranking #471 of 1,162 AI chart posts. Its score of 64 ranked #369 of 1,162 AI chart posts and #60 of 239 @arena posts.

The lesson

A 0.12% save rate, at the 70th percentile among AI chart posts, came with 64.3K views: the benchmark bar chart format drew saves above the 0.076% median.

What it means

At #60 of 239 @arena posts, this chart sits well inside the account's own range, while its 64.3K views clear the 39.9K median among AI chart posts.

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

15 points read off this chart

Estimated from the image 50%

Group	Value	Read
Claude Opus 5.5 (High)	1.31 $/task	estimated
Claude Fable 5.1 (Max)	2.5 $/task	estimated
GPT 6 Astra (Max)	3.61 $/task	estimated
Claude Opus 5 (Max)	2.98 $/task	estimated
Claude Opus 5 (High)	2.17 $/task	estimated
GPT 6 Sol (Max)	0.83 $/task	estimated
Claude Opus 4.8 (High)	1.69 $/task	estimated
Claude Fable 5 (High)	1.18 $/task	estimated
GPT 5.6 Sol (xHigh)	0.91 $/task	estimated
Claude Sonnet 5 (High)	1.24 $/task	estimated
Grok 4.7 (xHigh)	0.74 $/task	estimated
GPT 5.5 (xHigh)	0.97 $/task	estimated

Showing 12 of 15. All points, the redraw and the maker

Max plan · API

GET https://viral-chart.com/api/posts/265a29160141.json
GET https://viral-chart.com/api/charts/265a29160141.json
GET https://viral-chart.com/api/charts/265a29160141.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 265a29160141.

See the Max plan API docs

	Path	Returns	Plan
GET	`/api/v1/charts/265a29160141`	Title, publisher, date, form, point count; with a Max key, the data link	Open
GET	`/api/v1/charts/265a29160141/data`	Every point with its provenance and confidence, plus the redraw spec. Add ?format=csv for CSV	Max
GET	`/api/v1/charts/265a29160141/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/265a29160141/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.

More charts about Claude Opus 5

Claude Opus 5: Business workflows AutomationBench by effort level

OfficialX · AnthropicSep 22, 2026

Business workflows AutomationBench by effort level1.5M views · 3.6K likes