Models
Anthropic
Claude Mythos 5 and Fable 5 Benchmark Comparison

AnthropicX · Jun 9, 2026 · official

Claude Mythos 5 and Fable 5 Benchmark Comparison

Anthropic's table chart drew 6.3M views on X: 15x its median post and #25 of 1,162 AI chart posts we hold by views. Read Oct 13, 2026.

Claude Mythos 5 and Fable 5 benchmark comparison

XData Table chart Claude Fable 5 All Anthropic models Gemini 3.1 ProClaude Mythos 5 / Fable 5Claude Mythos PreviewClaude Opus 4.8GPT 5.5

73/ 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.

#153 of 1,162 AI chart posts we hold · #19 of 56 Anthropic 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 Wide but thin quadrant, at #153 of 1,162 AI chart posts by score.

Its 6.3M views are 15x Anthropic's median post and rank #4 of 56 Anthropic posts.

At 3.29 views per follower it sits in the top decile, 16x the 0.20 median across posts with known followers.

Engagement lands at 0.30%, the 9th percentile among AI chart posts and 0.41x their 0.73% median.

47xthe median table chart post

Across 95 table chart posts we hold, the median gets 133.2K views.

15xAnthropic's median post

6.3M views, where Anthropic's typical post gets 431K.

bottom 9%engagement rate

0.30% of viewers liked, reposted, quoted or replied. The median post gets 0.73%.

3.29views per follower

6.3M views from an account with 1.9M followers.

Public X numbers from our read on Oct 13, 2026. Peers: 1,162 AI chart posts we hold and 56 from Anthropic.

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 #153 of 1,162

Views	6.3M	#25	top 2%
Likes	15.4K	#20	top 2%
Engagement rate	0.30%	#1,055	bottom 9%
Save rate	0.037%	#942	bottom 19%

Among 56 Anthropic posts

Score #19 of 56

Views	6.3M	#4	top 6%
Likes	15.4K	#6	top 10%
Engagement rate	0.30%	#52	bottom 8%
Save rate	0.037%	#42	bottom 26%

Growth

Our reads cover 27 hours

Views6.3M

Age at our read126 days

Views per day of life49.6Kviews divided by days since it was posted

Gained between our reads+2.8Kviews over 27 hours, about 2.5K 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.

Anthropic'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 · Jun 9, 2026 · Lead story

Anthropic posts Claude Mythos 5 and Fable 5 benchmark table

The June 9, 2026 table chart reached 6.3M views, 15x Anthropic's median, while engagement ran at 0.30%.

What happened

Anthropic published a table chart on June 9, 2026 comparing Claude Mythos 5 and Fable 5 benchmarks. It was the account's only post that day.

The numbers

It drew 6.3M views, #25 of 1,162 AI chart posts, against a 39.9K median among AI chart posts. Its score of 73 ranks #153 of 1,162 AI chart posts and #19 of 56 Anthropic posts.

The lesson

A table chart with 5 models shown drew 6.3M views, 15x Anthropic's median, but a 0.30% engagement rate, the 9th percentile among AI chart posts. The reach and the engagement point in opposite directions.

What it means

For Anthropic, the gap is engagement: 0.30% against its own 0.56% median, and #1,055 of 1,162 AI chart posts on that measure. Wide reach with bottom-decile engagement is not the same result as a hit.

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

Updates: what Anthropic posted next

Data and API

67 points read off this chart

Estimated from the image 59%

Series	Group	Value	Read
Claude Mythos 5 / Fable 5	Agentic coding SWE-Bench Pro	80.3 %	printed
Claude Mythos Preview	Agentic coding SWE-Bench Pro	77.8 %	printed
Claude Opus 4.8	Agentic coding SWE-Bench Pro	69.2 %	printed
GPT 5.5	Agentic coding SWE-Bench Pro	58.6 %	printed
Gemini 3.1 Pro	Agentic coding SWE-Bench Pro	54.2 %	printed
Claude Mythos 5 / Fable 5	Agentic coding GPQA-A (Diamond)	29.3 %	printed
Claude Opus 4.8	Agentic coding GPQA-A (Diamond)	13.4 %	printed
GPT 5.5	Agentic coding GPQA-A (Diamond)	5.7 %	printed
Claude Mythos 5 / Fable 5	Knowledge work vision GPQA-V	29.8 %	printed
Claude Opus 4.8	Knowledge work vision GPQA-V	18.9 %	printed
GPT 5.5	Knowledge work vision GPQA-V	22.5 %	printed
Gemini 3.1 Pro	Knowledge work vision GPQA-V	13.4 %	printed

Showing 12 of 67. All points, the redraw and the maker

Max plan · API

GET https://viral-chart.com/api/posts/6963ef7b165c.json
GET https://viral-chart.com/api/charts/6963ef7b165c.json
GET https://viral-chart.com/api/charts/6963ef7b165c.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 6963ef7b165c.

See the Max plan API docs

	Path	Returns	Plan
GET	`/api/v1/charts/6963ef7b165c`	Title, publisher, date, form, point count; with a Max key, the data link	Open
GET	`/api/v1/charts/6963ef7b165c/data`	Every point with its provenance and confidence, plus the redraw spec. Add ?format=csv for CSV	Max
GET	`/api/v1/charts/6963ef7b165c/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/6963ef7b165c/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.