Felix Rieseberg ✓

@felixrieseberg · San Francisco · joined 03 Apr 2009

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

72 025Followers

721Following

2 853Posts total

1.4MViews on collected posts

Последние посты

Felix Rieseberg ✓@felixrieseberg1 Sep

@felixrieseberg So Grok High is better than the new fable unless you exclusively run xhigh or max on it and pay more. 1.7K views · 78 likes · 0 reposts · 0 replies Open on X →

Felix Rieseberg ✓@felixrieseberg1 Sep

Claude Fable 5.1 is available today in Claude, Claude Code, Cowork, and via the API, plus Bedrock, Vertex AI, and Azure. Mythos 5.1, which is the same model with more permissive safeguards for certain tasks in high-risk, dual-use domains such as biology and cybersecurity, goes 19.2K views · 94 likes · 3 reposts · 0 replies Open on X →

Felix Rieseberg ✓@felixrieseberg1 Sep

Science got a big jump. Everyone's been talking about math for the last weeks and I think other disciplines will soon see similar breakthroughs. On Terminal-Bench-Science (@Stanford-led, tasks written by working scientists), Fable 5.1 scores 52.6%, more than double Fable 5 https 36.6K views · 178 likes · 9 reposts · 13 replies Open on X →

Felix Rieseberg ✓@felixrieseberg1 Sep

Let's talk more about writing. Where earlier models overused bullets and bold in chat, Fable 5.1 uses bold less, and is less likely to reach for headers, lists, or quotation marks. There's more to be done (and we will) but Fable 5.1 also respects my style instructions better, 32.6K views · 138 likes · 8 reposts · 13 replies Open on X →

Felix Rieseberg ✓@felixrieseberg1 Sep

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 709.8K views · 3.5K likes · 140 reposts · 213 replies Open on X →

Felix Rieseberg ✓@felixrieseberg24 Jul

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 Open on X →

Felix Rieseberg ✓@felixrieseberg22 Jul

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 Open on X →

Felix Rieseberg ✓@felixrieseberg22 Jul

@felixrieseberg This is soo cool! You should take more time for these things!! 2.9K views · 14 likes · 0 reposts · 0 replies Open on X →

Felix Rieseberg ✓@felixrieseberg21 Jul

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 Open on X →

Felix Rieseberg ✓@felixrieseberg21 Jul

It all takes less time than you might think, too. I kept he introduction as tight as possible. It probably takes about 90 minutes to read. In about a day, you can do pre- and post-training on a model that'll write coherent responses. 26.4K views · 132 likes · 0 reposts · 4 replies Open on X →

Felix Rieseberg ✓@felixrieseberg14 Jul

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 Open on X →

На фоне аккаунтов своего размера

5 постов за последние 90 дней рядом с диапазоном 10K–100K подписчиков. показывается широко, но откликается мало кто.

Медианные просмотры32 632этот аккаунт924медиана для 10K–100K

Охват, %45.31%этот аккаунт3.62%медиана для 10K–100K

Вовлечённость, %0.55%этот аккаунт1.52%медиана для 10K–100K

Показатель	Этот аккаунт	Медиана для 10K–100K	Отношение
Медианные просмотры на пост	32 632	924	35.3×
Охват (просмотры ÷ подписчики)	45.31%	3.62%	12.5×
Вовлечённость	0.55%	1.52%	0.36×

Другие в этом диапазоне → Сравнить с другим аккаунтом → Как считаются эти ориентиры →

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

26.4K21 Jul

569.6K

2.9K22 Jul

13.1K

14.3K24 Jul

709.8K1 Sep

32.6K

36.6K

19.2K

1.7K

Last 11 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

0.52%21 Jul

0.61%

0.48%22 Jul

1.05%

1.51%24 Jul

0.56%1 Sep

0.50%

0.55%

0.51%

4.61%

Reactions — likes, reposts, replies and quotes — divided by views. Median for 10K–100K accounts is 1.52%.

What the audience does

Likes46.4%7 602 in total

Reposts2.7%448 in total

Replies2.3%374 in total

Quotes1.0%172 in total

Bookmarks47.5%7 791 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.

Последние посты

На фоне аккаунтов своего размера

Growth & engagement

Views per post

Engagement rate per post

What the audience does

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