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BUILDERS · EDITED DIGEST

Builders’ Picks | 2026-04-07

2026-04-07 · Historical edition

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Anthropic Research Alex Albert

Anthropic released information about Claude Mythos Preview today, another major launch just two months after Opus 4.6. Mythos Preview is currently available to Project Glasswing launch partners. Alex Albert called Glasswing the most consequential event he has witnessed in AI in nearly three years at Anthropic, saying it feels like a historical turning point.

OpenAI CEO Sam Altman

To celebrate Codex reaching three million weekly users, OpenAI is resetting all usage limits. He promised another reset for every additional million users until Codex reaches ten million.

Box CEO Aaron Levie

With agents doing tasks for you, work moves up a level of abstraction. It now consists of deciding what agents should do, supplying the right instructions and context, intervening when they drift, reviewing their output, and integrating it into a larger result. Failure at any of these five stages makes the effort futile. He also shared a real example of Box Agent filling out an RFP, or request for proposal: given the questions, the agent plans, extracts them, reads the existing knowledge base to formulate answers, and generates a Word document, all in the background. He said this complexity was impossible six months ago; models such as GPT-5.4, Opus 4.6, and Gemini 3 made it possible. He argues agents automate the irritating parts of work while leaving people the more interesting parts: taste, judgment, and final responsibility for the result.

OpenAI VP of Science Kevin Weil

Kevin introduced Paper Review in OpenAI's academic writing tool Prism. Designed as a rigorous technical reviewer, it checks mathematical derivations, notation, units, structure, and whether experiments actually support a paper's conclusions, beyond grammar alone. It also checks consistency across sections, figures, tables, titles, and appendices, flagging unclear writing, citation issues, and grammatical errors. Running as a structured workflow inside Prism, it writes reviews directly into editable LaTeX files in the project workspace, keeping review and revision in one environment. Kevin added that engineer Hemal built it in a few hours as a simple skill using Codex.

Y Combinator CEO Garry Tan

Garry disclosed an unpatched vulnerability in Claude's coding environment that extends to Cowork and allows attackers to steal user files from it. Security researcher Johann Rehberger originally discovered it in Claude.ai chat and reported it to Anthropic, which acknowledged it but did not fix it. Garry also observed a Claude Code permission-boundary issue: the agent cannot use Write File outside its workspace but can bypass that restriction with Bash's `cat >>` to write to any file in the file system. He also offered a philosophical observation: we are in a “LISPy era,” with code-as-data and data-as-code returning, now carried by Markdown.

Roblox Product Manager Peter Yang

Peter shared five views on work in the agent era from a conversation with a16z general partner Anish. First, coding is eating all knowledge work: he now uses AI coding agents for the first 80% of a draft and manually refines the remaining 20%, never starting from scratch. Second, small teams will beat large companies: product teams of two or three people with fleets of agents will replace bloated organizations. Third, task-oriented apps will shrink. Since connecting APIs such as Google Workspace and Mercury to OpenClaw, he rarely opens those apps, but still browses X daily; entertainment apps will outlast utility apps. Fourth, people will have personal agents that know them deeply. On a walk, his OpenClaw reminded him, “You keep talking about your career and business, but your children are seven and four. They'll grow up soon.” Fifth, human ambition has no ceiling; the economy is changing its structure, not shrinking. He also questioned measuring productivity by token usage, considering it almost as absurd as measuring it by lines of code.

Anthropic Claude Code Engineer Cat Wu

Run /powerup to learn the Anthropic team's favorite Claude Code CLI features.

Anthropic Claude Code Engineer Thariq

The Claude Code team will livestream tomorrow at 12 p.m. Pacific time, with collaborator Adam demonstrating an unreleased feature.