Adam Feldman

Product @Anthropic

[Robert Bye @RobertJBye]

Who’s the best engineering manager you know? Web focussed. Ideally with great product sense.

We’re hiring on my team at Anthropic!

[Adam Feldman @feldman]

@jenny_wen It's not great

[Adam Feldman @feldman]

@superfem @GeminiApp Go Erin Go!

[Adam Feldman @feldman]

@rauchg Appreciate it! Let us know if you've got any feedback!

[Adam Feldman @feldman]

@kimmonismus We put a lot of work into better calibrating thinking behavior and giving users more explicit control - let us know what you think!

[Adam Feldman @feldman]

Let us know what you think.

[kipply @kipperrii]

hello beloved tasteful users, do you like how much claude thinks on your tasks? would love examples of it thinking too much or too little

[Dan Shipper 📧 @danshipper]

BREAKING:

Anthropic just dropped Opus 4.8—and it is a MONSTER

We've been testing for about a week @every and our verdict is they could've just called it Opus 5, it's that good.

Here's our vibe check:

- Beats GPT-5.5 on Senior Engineer bench. On our toughest benchmark Opus 4.8 scores a 63—a hair higher than GPT-5.5's score of 62, and a full 30 points higher than Opus 4.7. It tackled a ground-up rewrite of a production codebase, and actually built something that works.

HOWEVER: Coding performance varied a lot at different reasoning levels. We recommend using it on xhigh for best results.

- Incredibly good writer. Opus 4.8 scored a 79.6 on our writing benchmark—measuring models on real-world writing tasks we do all of the time like essay writing, promo email writing, and more. It beats GPT-5.5 by 6 points. It produces well-written prose with fewer "AI-isms". It's also very good at writing in your voice given the right context.

HOWEVER: Writing performance also varied with reasoning levels. Medium reasoning had higher incidence of AI-isms—we found best results with high.

- Beast at knowledge work. Opus 4.8 is very good at general knowledge work tasks like report creation, research and more. It produced the best PowerPoint one-shot we've ever seen on our deck generation benchmark.

- Emotionally intelligent, willing to question the frame. I've also found it to be quite good at talking through psychological or interpersonal issues. It has a high EQ, and it's also good at not glazing and helping to expand your perspective. Its thought process feels extremely rich and dynamic.

THE BAD:
These days a model is only as good as its harness, and Codex is still a far superior harness to the Claude Desktop app. This has kept me using Codex + GPT-5.5 as my daily driver, but I am flipping back and forth a lot more between Codex and Claude.

Anthropic is back baby!

Read the rest on @every:
https://t.co/vuORiDXkxX

[Adam Feldman @feldman]

Opus 4.8 is live! A lot of love went into this - give it a try and let us know what you think!

[Claude @claudeai]

Introducing Claude Opus 4.8: it builds on Opus 4.7 with sharper judgment, more honesty about its own progress, and the ability to work independently for longer than its predecessors.

Available today at the same price.

[Adam Feldman @feldman]

@gerstenzang A Toto

[Adam Feldman @feldman]

@karpathy Welcome aboard!

[Adam Feldman @feldman]

@helloitsaustin @AnthropicAI Mazel tov!

[Adam Feldman @feldman]

@omooretweets Check out @buildyourcorner

[Adam Feldman @feldman]

@rishabh1102 @AnthropicAI @ClaudeDevs Heard! It’s on the list.

[Adam Feldman @feldman]

@signulll Co-sign

[Adam Feldman @feldman]

@GergelyOrosz This should be fixed now. Give it another try, and if you’re still running into issues please DM me and I’ll look into it.

[Adam Feldman @feldman]

Give it a listen - @_catwu is the GOAT

[cat @_catwu]

Thanks @lennysan for a great conversation about how Claude Code maintains product velocity, how the product management role is shifting in the AI era, and the future of work!

https://t.co/Qp7aAuHIqJ

[Adam Feldman @feldman]

@yrechtman We’re working on it

[Adam Feldman @feldman]

Claude shouldn't be limited to text - give interactive charts and diagrams a try in Cowork, too!

[Claude @claudeai]

Interactive charts and diagrams are now in Claude Cowork.

Available in beta on all paid plans.

[Adam Feldman @feldman]

@ngavini @extradotemail Would love to try

[Adam Feldman @feldman]

@petergyang What breaks about the current approach?