BREAKING:
Anthropic just dropped Fable 5.1—and CLAUDE IS SO BACK.
We’ve spent the last week testing it at
@every across coding, writing, and knowledge work. Our verdict:
It's finally Fable for everyone.
It’s the strongest coding model we’ve used, but now it's fast, token-efficient, and CRUCIALLY actually speaks like a normal person.
Here’s our vibe check:
- A monster at coding.
@kieranklaassen rebuilt a working version of Proof, our document editor, from one prompt. It added useful details he hadn’t requested, and it handles enormous coding jobs that run for days at a time. It built a computer use Mac app for me called Hands in one-shot that other models failed at.
- A Claude our writers want to use again. It has clearer prose, fewer AI tells, and it takes an edit without arguing. It's a significant upgrade over Opus 5. And won
@kplikethebird's heart back.
- About half the tokens as Opus 5, and much faster. In our Slack-agent tests, it delivered comparable results to Opus 5 using about half as many tokens, in about 60% of the time.
- Knowledge work you can delegate. It can produce great knowledge work—like slide decks—end to end without making slop. And flew threw
@hammermt's tests with flying colors.
- It now supports zero-data-retention agreements. Now businesses can actually use it! A big barrier to Fable adoption is gone.
Net Result:
It's obviously an Opus 5 killer. If that was your daily driver you should switch today.
If you're using GPT-5.6 in ChatGPT for Work, it's spinning the wheels on for big delegated tasks.
I still use ChatGPT for Work more day to day, but I use way more tokens in Fable 5.1. I send it off at the beginning of the day to do big programming projects, like end to end MVP builds, and check in every once in a while.
State of Play:
The big knock on Anthropic was they built a supergenius in a datacenter that was almost unusable. It was too slow, argued back, and talked in technical gibberish. They've managed to solve those problems and more with Fable 5.1!