Dane Vahey

41 Lessons in 41 Months @Stripe I recently left @stripe, and wanted to share some of Lessons I took away from my 41 months at the company. Buckle up for a 41-tweet 🧵

I've really underestimated the importance of the GPT-5.5 instant launch in ChatGPT This model is awesome

Codex is not like claude code. if you know the limit is going to end, like last 10 to 8%, give an very long run task, and even after the limit got ever, it will continue to do the task until the task was completed. Shout out to @OpenAI team.

For clarity, we are running a small test for ~100% of Codex users where we: - make our best models available to all users - make Codex available to all plans, free and paid Claude Code users aren't affected :)

@zebriez @joincolossus thank you for this brie, so perceptive

I spent the last 60 days working at Cursor. It's been one of the most thrilling phases of my professional life. There's a lot of mystique around the company. Over the last two months, some things matched my expectations; many did not. I wrote an essay for @joincolossus about things that have surprised me about the company and its culture so far. joincolossus.com/article/inside…

soooo good

Updates to ChatGPT: You can now choose between “Auto”, “Fast”, and “Thinking” for GPT-5. Most users will want Auto, but the additional control will be useful for some people. Rate limits are now 3,000 messages/week with GPT-5 Thinking, and then extra capacity on GPT-5 Thinking mini after that limit. Context limit for GPT-5 Thinking is 196k tokens. We may have to update rate limits over time depending on usage. 4o is back in the model picker for all paid users by default. If we ever do deprecate it, we will give plenty of notice. Paid users also now have a “Show additional models” toggle in ChatGPT web settings which will add models like o3, 4.1, and GPT-5 Thinking mini. 4.5 is only available to Pro users—it costs a lot of GPUs. We are working on an update to GPT-5’s personality which should feel warmer than the current personality but not as annoying (to most users) as GPT-4o. However, one learning for us from the past few days is we really just need to get to a world with more per-user customization of model personality.

With only two weeks left, here’s a quick check-in on some of the submissions to the OpenAI to Z Challenge so far:

OpenAI just announced o3, their new reasoning model that appears to perform insanely well across benchmarks. There are simply no signs of a slow down in AI right now.

The motto of every entrepreneur You have to be optimistic to the point of naïveté to start a business.

OpenAI just made their new GPT4 model 50% cheaper and 2X faster for developers. This is an insane level of improvement for anyone building in AI right now.

Valentines Day: where parents on texts threads fight about the ethics of bringing to class treats with sugar

I guess it makes sense that @Cinnabon has a protein powder??

When your head of sales is visiting and accidentally locks the whole team out of the office 😂😂😂

Enterprises LOVE using NexHealth as we're the best system for syncing with each of their different EHRs. Powerful to see how our API is game changing for enterprises.

1000%

One of my favorite tweets. Think about this all the time.

Lucky to have @scottbelsky drop in with @alfromnexhealth and the @nexhealthHQ team to share… = unconventional wisdom on collapsing the talent stack = how he manages a 9000 person @Adobe product org 🤯 = how liquidity paths have changed for startups

🐳 alert! Huge win from the team, partnering with 200+ offices to transform the patient experience.

@sterlingmsnow Congrats Sterling! Exciting new challenge.

As I thought about what came next after Divvy I had a few main criteria: 1. I want to work with the most talented and best people. 2. I want to be building and improve my abilities as a builder. 3. I want to help the Utah ecosystem. 4. I want to chase excellence.

New screen in the back of my ⁦@lyft⁩ — looks like Lyft is getting into the ad selling business 👀