Thomas Witt

🚀 Founder & CEO @ •🪽Angel Investor @

[Thomas Witt @thomas_witt]

How I freed a pool heat pump from an unencrypted Chinese cloud server https://t.co/krGpu4m1Ps

[Thomas Witt @thomas_witt]

https://t.co/n4M7bKOj2E

[Peter Steinberger 🦞 @steipete]

In der USA sind die meisten Menschen enthusiastisch.
In Europa werde ich beschimpft, Leute schreien REGULIERUNG und VERANTWORTUNG.

Und wenn ich wirklich hier eine Firma baue dann kann ich mich mit Themen wie Investitionsschutzgesetz, Mitarbeiterbeteiligung und lähmenden Arbeitsregulierungen abkämpfen. Bei OAI arbeiten die meisten Leute 6-7 Tage die Woche und werden depentsprechend bezahlt. Be uns ist das illegal.

[Thomas Witt @thomas_witt]

@garrytan Agreed. Rails and Code+Claude is just a dream. Perfectly organized code, no AI slop.

[Thomas Witt @thomas_witt]

@garrytan 💯 agree. The level of productivity we get with Claude / codex to build our app with ruby is mindblowing. Also thanks to additions like the async libraries to the ecosystem, it also scales immensely.

[Garry Tan @garrytan]

I think people are sleeping a bit on how much Ruby on Rails + Claude Code is a *crazy unlock* - I mean Rails was designed for people who love syntactic sugar, and LLMs are sugar fiends.

[Thomas Witt @thomas_witt]

$285B wiped out because Anthropic posted a text file on GitHub.

Not a new model.Just ~2,500 lines describing how to review contracts—first-year law school stuff.

"Sophisticated" traders panic-sold on a headline without checking anything.

Traders have no idea what they trade on

[Thomas Witt @thomas_witt]

I just released the aws-sdk-http-async gem: https://t.co/zo2vI0KMHY - an Async HTTP handler plugin for the AWS SDK for Ruby, built on async-http

More information on the background: https://t.co/bAnb7CDlHH

#ruby #rails #aws #async #fibers

[Thomas Witt @thomas_witt]

Finally codex supports conversation steering as experimental feature and is catching up to claude code.

Also worth reading regarding codex as agent: https://t.co/eJvC2pTAV7

[Thomas Witt @thomas_witt]

“Read the headlines: AI will make developers obsolete. The era of the developer is over. When cloud computing arrived, they feared automation would make them obsolete. Instead, it created an explosion of new companies and new engineering roles” – @Werner

https://t.co/v9SaT2SnrI

[Thomas Witt @thomas_witt]

@dhh Skipped on codex? I had the best results with codex CLI for rails. Opus for planning, codex for coding. Double code review with Claude calling codex as mcp.

[Thomas Witt @thomas_witt]

Some examples of people quickly accomplishing ambitious things together: https://t.co/thhVaFmm7V

[Thomas Witt @thomas_witt]

The latest 2.0.64 release of Claude code is interesting. Besides finally named sessions and async agents, they support so-called rules. Maybe that's finally a solution that claude follows coding styles better:

https://t.co/lnyyqTov3r

(https://t.co/S0gmQV7pjg)

[Thomas Witt @thomas_witt]

Writing a good https://t.co/WCFmkBwKFB | HumanLayer Blog https://t.co/AqSsphvge6

[Thomas Witt @thomas_witt]

gpt-5.1-codex gives for me (Ruby on Rails codebase) MUCH better results on the high setting.

[Thomas Witt @thomas_witt]

First tests with @OpenAI 's new gpt-5.1-codex-max - even on xhigh - are very disappointing. It doesnt follow instructions well and I can see nowhere that its working 24 hours on tasks - it basically gives immediately answers to very complex tasks, which can't be right. #codex

[Thomas Witt @thomas_witt]

Coding Agents Tip: When implementing large features, you MUST write a markdown spec doc first, divided in phases & subtasks (#Claude in ultrathink plan mode is quite good at this). Then ask #codex to implement it and stop at each phase. Then run claude & another codex to review.

[Thomas Witt @thomas_witt]

The first really great video IMHO about Claude Codes Skills vs. Slash Commands vs Subagents:

https://t.co/PFr1WUKdQw

Kudos to @IndyDevDan!

[elie @eliebakouch]

Training LLMs end to end is hard. Very excited to share our new blog (book?) that cover the full pipeline: pre-training, post-training and infra. 200+ pages of what worked, what didn’t, and how to make it run reliably

https://t.co/iN2JtWhn23

[Kevin Kern @kevinkern]

If you're setting up your Coding CLI, here are some tools worth adding.

I've found fd, ripgrep, and ast-grep especially useful when working with codex.