The newsletter for ai builders of all levels. Mini-tutorials, tool reviews, and lay of the land from an exited founder turned investor and forever tinkerer.

Hey folks,

Claude Sonnet 4 now has a context window of 1M tokens¹²⁶ (up from 200k earlier). In beta for Tier 4 API customers (=spent $400 or more on API). Pricing is higher for prompts with more than 200k tokens.

• $3/$15 per 1M tokens input/output for prompts ≤200k tokens

• $6/$22.5 per 1M token input/output for prompts >200k tokens

Gemini has had long context for a while, and GPT-4.1 joined it earlier this year. Sonnet 4 is Claude’s entry in the race.

Gemini is getting two new features⁹⁵: personal context (i.e. memory) and temporary chats. Personal Context has two parts: referencing past chats and saved bits of memory. You can turn off each part individually. Keshav uses Gemini a lot, his pov:

Gemini already has both of these, so this is likely just a rebrand of these features. But Gemini does it slightly different than ChatGPT. Instead of automatically saving info, Gemini saves it when you ask it to. Similarly, it searches for past chats when you ask it, instead of mysterious references like ChatGPT (which sometimes work, sometimes don’t). I still have the “saved bits” off in Gemini but I often ask it “remember we talked about this”.

— Keshav

Temporary chats are just one-off chats that don’t get saved in your chat history, like an incognito tab.

The model picker is back in ChatGPT¹⁰¹. Don’t care about it. Just use “Thinking” until you hit limits (3000 messages/week in the Plus plan).

Is your enterprise data at risk from unchecked AI use? Airia lets you rapidly deploy AI agents at scale across your enterprise - all with built-in governance, runtime security, data leakage prevention, and more. Plans start at $49/month. Secure AI at scale.¹⁰⁸*

From the portfolio:

Anything recently rebranded and I’ll be doing a video deep dive next week on all the wonderful things you can build with it (including auth, payments, database, storage etc, all included). Today they launched on Product Hunt¹⁶⁸ - show them some love ❤️.

Factory AI¹³¹ built a new interface to manage Droids (their coding agents) specifically for;

1. Specification – Distraction-free, chat-only scoping

2. Management – Full context view without breaking review flow

3. Review – Instant unified diffs, no folder hunting

The more I’m working with agents, the more the interface thinking really matters - terminal view is too rigid, IDEs have too much going on.

*sponsored

🌐 What I’m consuming

• Can you explain your school’s AI policy³¹⁸ in 30 seconds?

• Doomprompting⁸⁶⁴ is the new doomscrolling.

• AI Dev Tools²⁶⁹ demo night.

• 5 types of purchases²⁶⁹ and AI’s place in that transaction?

⚙️ Tools to tinker with

• Sōkosumi²⁹⁶ saves 2+ hours daily with AI agents that actually work for business. Pay-per-task and EU-based. Sokosumi.com²⁹⁶ + BENSTOOL100*

• Mulerun³⁵⁰ - marketplace for AI agents.

• Cobot³⁷⁴ - A to-do app that does it for you with integrations to 30+ apps. I just got access and had some hiccups when testing - I think the team is awesome, and it’s early, so expecting a lot of good stuff to come out of it.

• Restyle in Freepik¹³⁶ - Transfer a style from a preset or a colour palette while keeping the structure of your images intact.

• fal Workflows 2.0¹³⁶ - Visual builder to connect models on Fal, without writing any code.

• App Storage in Replit⁶⁸ - built-in storage for apps that need to store files like PDFs or images shared by users. (Well, they already had it but renamed it and added some upgrades).

• You can now connect Gmail, Google Calendar and Google Contacts to ChatGPT¹⁹⁴ (on the $20/mo plan).

*sponsored

🥣 Dev dish

• Open Lovable³⁹⁴ - Open source app to create a working, editable clone of any website from its URL.

• A collection of MCP servers by IBM²³⁸.

• pyx¹¹⁶ - Python-native package registry from the creators of uv.

• Custom Onboarding¹⁴⁷ - Demo by Browserbase to customise a user’s dashboard based on onboarding info.

• Jan-v1¹⁵¹ - 4B model for web search, an open-source alternative to Perplexity Pro.

🍦 Afters

• HumanLoop²¹⁷, an AI evals platform, is joining Anthropic.

• Warp University¹⁶⁴ - Learn how to use Warp effectively for code and prompt-driven development.

• $5 for 5 min with a dev³⁰⁵ to help unblock when you’re stuck vibe coding.

• Apple’s latest AI swing is a tabletop robot²⁹⁴ coming in 2027.

• xAI’s co-founder Igor Babuschkin is leaving⁸³ and starting an investment firm for AI safety.

• Perplexity is making an unsolicited offer⁸¹ to buy Chrome for $34.5B while it is raising at a $20B valuation³⁸. And looks like Perplexity’s been hunting for browsers⁶⁹ for a while now.

That’s it for today. Feel free to comment and share your thoughts. 👋

• Find me on X³⁹, Linkedin³⁹, or Instagram³⁸

• Read about me³⁴ and ben’s bites

📷 thumbnail creds: @keshavatearth³⁹