Felix Rieseberg ✓

@felixrieseberg · San Francisco · joined 03 Apr 2009

I build things @AnthropicAI, Co-Maintainer https://t.co/g4potti8nq

72 006Followers

721Following

2 853Posts total

1.3MViews on collected posts

Against accounts of the same size

5 posts from the last 90 days, next to the 10K–100K follower range. shown widely, but few of those viewers react.

Median views14 262this account2 896median for 10K–100K

Reach, %19.81%this account9.51%median for 10K–100K

Engagement, %0.89%this account1.56%median for 10K–100K

Metric	This account	Median for 10K–100K	Ratio
Median views per post	14 262	2 896	4.92×
Reach (views ÷ followers)	19.81%	9.51%	2.08×
Engagement rate	0.89%	1.56%	0.57×

Others in this range → Compare with another account → How these benchmarks are built →

Growth & engagement

How the posts we collected actually performed: views and reaction rate post by post, what the audience did with them, and where the follower count goes.

Views per post

14K14 Jul

569.6K21 Jul

13.1K22 Jul

14.3K24 Jul

667.6K1 Sep

Last 5 collected posts, oldest on the left. The scale is logarithmic: one post can outrun the rest a hundred times over.

Engagement rate per post

0.89%14 Jul

0.61%21 Jul

1.05%22 Jul

1.51%24 Jul

0.59%1 Sep

Reactions — likes, reposts, replies and quotes — divided by views. Median for 10K–100K accounts is 1.56%.

What the audience does

Likes44.7%6 947 in total

Reposts2.8%428 in total

Replies2.2%341 in total

Quotes1.0%161 in total

Bookmarks49.4%7 678 in total

Share of every reaction we collected for this account. Replies mean argument, reposts mean endorsement, bookmarks mean the post was worth keeping.

The follower curve appears once this account has two daily snapshots — we take one a day, and this one is on its first.

Latest posts

Today, we're releasing Fable 5.1 and Mythos 5.1. While the model is getting slightly better at a lot of things, I expect many users to appreciate that Fable 5.1 solves agentic coding tasks at roughly half the cost of Fable 5. I personally also really like it's writing style, htt 667.6K views · 3.4K likes · 140 reposts · 210 replies 01 Sep 2026 Happy Opus 5 launch day! It's a good model - on multiple benchmarks, it's SOTA and beats Fable 5, especially long-horizon agentic tasks. On the rest, it gets pretty darn close. I bet that it'll become many people's favorite workhorse for serious work in Claude Code, Cowork, and 14.3K views · 197 likes · 6 reposts · 13 replies 24 Jul 2026 New feature in Language Model Builder: You can now import base models. The results are a bit of an overfitting fever dream, but I've also added iMessage group chats as a fine-tuning data source. Come, train a model based on your silly group chats: https://t.co/nLjFfpczbV https 13.1K views · 122 likes · 5 reposts · 9 replies 22 Jul 2026 Have you built a language model? You should. It's so much fun to chat with something you made. Anyone can do it, too. I made an app that teaches the fundamentals and gives you everything you need to build your own: https://t.co/nLjFfpczbV https://t.co/akIMnTzOEG 569.6K views · 3.1K likes · 273 reposts · 97 replies 21 Jul 2026 Something I’m excited about: Free premium Claude and Cowork for K-12 educators and teachers in the US, together with a library of teaching skills. To find out more, check out https://t.co/O20Lnyd3EK 14K views · 109 likes · 4 reposts · 12 replies 14 Jul 2026