Two startups want to solve content and invoicing

Welcome back, Superhuman. How bad was this month’s stock selloff? Bad enough to force one of AI’s most talked-about hedge funds nearly out of business. Founded by a former OpenAI employee, the fund had soared roughly 1,000% since 2024 — but that momentum reversed practically overnight.

Today: Freehand chases overdue invoices, how to edit videos using ChatGPT with zero editing skills, and get the latest prompts and trending social posts.

1. One of the largest AI hedge funds collapses under the market selloff: Leopold Aschenbrenner — the 25-year-old former OpenAI employee turned hedge fund manager — has reportedly sold Situational Awareness’s entire public portfolio to Ken Griffin’s Citadel. Aschenbrenner’s strategy centered on taking concentrated, leveraged positions in AI infrastructure stocks. It led to supercharged returns while the market was climbing, but reversed course quickly during the past month’s rapid selloff. Read the full story.

2. Freehand raises $75M to reduce wasteful corporate spending: Freehand’s AI platform helps companies avoid overpaying on invoices by monitoring every step of the process — double-checking contracts, messaging suppliers, and reconciling data. The startup claims to have recovered $260M in overpaid invoices last year across Meta, J&J, and Unilever by tracking down small amounts that most companies don’t have the bandwidth to chase. See how it works here.

3. Stan launches a textable agent that creates social media content: Stanley proactively creates relevant social media posts by plugging into your most-used tools, learning your unique writing voice, and publishing across LinkedIn, X, Instagram, and other platforms. The startup claims Stanley runs all posts by you before publishing, and automatically eliminates any common tells of AI writing, like em dashes or “it’s not x, it’s y.” Watch Stanley in action.

Yesterday’s most-clicked story: Tavus launched PAL Maker, a new platform that lets anyone build a digital human.

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The open letter cautions that AI could advance "beyond our ability to understand or control the resulting systems," and calls on the US government to deliberately pace progress at the international level, which would reduce competitive pressure on each lab. Signatories include chief scientists at OpenAI, Anthropic, and Meta. The scale of the signatory list — spanning companies and roles — is a signal of how seriously insiders are taking the risk.

Claude Opus 5 matches Fable 5's performance on many benchmarks at roughly half the price, and is now live across all Anthropic platforms. Anthropic says it's especially strong at agentic coding and enterprise work, and it ships with a fast mode that runs at 2.5x normal speed. The company also published an Opus 5 Prompting Guide to help you master the new model quickly.

Kimi K3’s weights and technical paper were cleared for research, personal, and commercial use, with some guardrails for commercial deployment. Demand for K3 was so intense that the lab had to pause new subscriptions to manage its compute. The model’s quality and affordability will likely put pricing pressure on top US labs. Read more on Kimi K3.

The startup publicly launched its flagship model, S2.1 Pro, and its founders demoed the tech by cloning their own voices live, in real time. It just announced $52M in seed funding to cap off its first year as a company. Try it yourself.

Readers also love this guide to the new rules for context engineering from an Anthropic engineer, as well as a viral video of a Senator accidentally reading an AI prompt as part of his speech.

✏ Improved Writing: Want your AI to write more clearly? This post has racked up 11K bookmarks with a simple prompt that eliminates most signs of AI writing. Just upload it before every conversation or permanently add it to your LLM’s instruction file.

😅 The Big Leagues: A 5-step interview process can feel excessive. But compared to OpenAI’s, that’s nothing. One candidate leaked what it’s like to interview at the top lab, but let’s be honest — OpenAI’s median compensation is definitely worth the time commitment (1M views).

🧐 Seems Sloppy: LinkedIn is testing a “seems like AI slop” button, letting you report any post that just feels off. Given the platform's reputation, expect heavy use. See which other social platforms suffer the most from AI slop.

👀 Uncanny Valley: One Redditor had ChatGPT create an uncanny image from the “deepest corner” of its mind. The original poster said they loved and hated what it created at the same time. View the image here (1.9K upvotes).

🤳 Minimizing Screens: One dad wanted his toddlers to be able to talk with their grandparents whenever they wanted, without giving them a cell phone. He vibe-coded an out-of-the-box solution that lots of people are eager to replicate (1M views).

Most teams can demo an AI agent. Far fewer can make one reliable, observable and cost-effective in production. On August 4, join Nebius, LangChain and Tavily for a live compliance-audit agent build with Deep Agents and NVIDIA Nemotron 3 Ultra, no fine-tuning required. See how to reach frontier-level quality at roughly 1/10 the cost.

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Until next time — Zain, Theodore, & the Superhuman AI team.