Codex on your phone, Mythos cracks the Cooling Tower

May 14 had three separate storylines running at once. OpenAI moved Codex from a standalone tool into the ChatGPT mobile app. Anthropic published a cybersecurity first that went relatively under-discussed. And Trump's arrival in Beijing generated a surprisingly productive thread of tech commentary — mostly about phones.

Sam Altman (@sama) announced yesterday evening that Codex is now inside the ChatGPT mobile app, available as a preview on iOS and Android. 1 The follow-up tweet added "also all this:" with what appears to be an expanded feature list. 2 The two together pulled 4,347 + 932 likes.

宝玉 (@dotey) put numbers to the release: Codex now has 4 million+ weekly active users, and the mobile integration currently connects to a macOS host running Codex — Windows support is described as "coming soon." 3 The architecture is a relay rather than a native port; the phone front-end tunnels into the desktop agent.

On the developer side, Peter Steinberger (@steipete) shipped a skill that runs codex /review in a loop until no issues remain. 4 The caveat he included: it won't fix system architecture, so "you still need BRAIN as master model." 2,002 likes, 2,118 bookmarks — the bookmarks suggesting people plan to actually run it.

Boris Cherny (@bcherny), Claude Code lead at Anthropic, posted early in the morning with a result from the UK AI Safety Institute (AISI): Anthropic's Mythos Preview is the first AI model to solve both of the AISI's cyber ranges end-to-end. 5 One of them — the "Cooling Tower" range — had never been solved by any model before.

1,079 likes, 151,759 views. The framing — defenders, responsible deployment, a named but not-yet-disclosed "Glasswing" project — reads as a deliberate heads-up to the security community rather than a marketing announcement. No independent statement from the AISI was found at collection time.

宝玉 (@dotey) covered Anthropic's launch of Claude for Small Business, which integrates Claude directly into QuickBooks, PayPal, HubSpot, Canva, and DocuSign. 6 No additional charge on top of existing subscriptions. Starting May 14, Anthropic is running free half-day training sessions in 10 US cities. 219 likes. Dotey flagged a Dario Amodei quote — "individual SaaS vendors may quickly lose market cap, or even shut down" — as the context behind the move.

A separate post from the same account drew a cleaner distinction than most explanations manage: context is all the information an AI agent actually holds while executing a task; context window is the model's hard capacity limit. 7 "Context is the content, context window is the container." 109 likes, 24 retweets — compact enough to screenshot, which probably explains why it circulated.

Zayn Hao (@ZaynHao) strongly recommended a podcast episode covering how the Claude Code team at Anthropic operates — how they divide roles, how decisions get made, how the team has changed. 8 265 likes, 365 bookmarks. The bookmark count is higher than the like count, which usually indicates a resource people are filing away rather than just surfacing for others.

Peter Steinberger (@steipete) had a full day. He opened with an unexplained photo captioned "I give up. I am not a human." 9 806 likes. Context unavailable, but the engagement suggests it landed.

By evening, Steinberger posted a release summary for OpenClaw: heavy investment in performance, reliability, security, and stability over the past period, including new automation flows built with crabbox and automated video QA running on CI. 10 His verdict: "It's a good release." 655 likes.

Two smaller tool releases accompanied it. mcporter 0.11.0 — a browser automation CLI Steinberger says he uses mainly as a more stable agent interface for testing MCP servers without restarting them. 11 145 likes. Proxyline 0.2.0 — process-global proxy routing for Node.js, covering node:http, node:https, fetch/undici, WebSocket, and CONNECT in a single policy, eliminating 12 sub-dependencies from global-agent. 12 133 likes.

奶昔 (@realNyarime) posted a photo of Elon Musk during Trump's China visit with the caption "马斯克：小手机真好玩" ("Musk: small phones are so fun"). 13 1,014 likes. Two hours later, a photo of Xiaomi (小米) CEO Lei Jun appeared alongside the caption "雷军：看看我的大手机" ("Lei Jun: look at my big phone"). 14 217 likes. The pair reads as a visual punchline: two tech figures, two phones, maximum size differential.

Yue (@caiyue5) asked a different question about the same trip: why did Tim Cook fly his own private jet to China rather than joining Trump on Air Force One? 15 "I find this not very eco-friendly," she added. 282 likes, 199K views. No answer is in the tweet — the rhetorical observation was enough.

郭宇 / guoyu.eth (@turingou) posted a small series documenting his dependency on AI for tasks he used to handle manually. The starting point: visa application paperwork that once took him a full day now takes two cc prompts to Claude. He suggested Anthropic should partner with global visa facilitation services (VFS Global) to automate the application pipeline. 16 126 likes. The follow-up went further: Codex is now generating visa documents in LaTeX. 17 "Who would write LaTeX for a visa application before coding agents existed?" 174 likes.

A third post from the same account addressed Chinese tech culture specifically: in Chinese-speaking communities, talking openly about what you're building tends to draw "wrapper product" accusations. 18 郭宇 compared the reflexive low-profile culture to Japanese indirectness — both are patterns he sees as limiting rather than virtuous. 141 likes.

Jacob Titus (@jacob__titus) posted "Every generation experiences a Great Lakes awakening." 19 520 likes. No image attached — the sentence is the image.

Sophia (@SophiaFioren) had three posts clear the threshold. A staircase in a private Berlin apartment, described as "unfolding like a rosebud, blending geometry and poetry." 20 228 likes, 71 retweets. An Orchid Comb by René Lalique (1903) — an Art Nouveau hair accessory in gold and enamel, part of Lalique's jewellery period before he pivoted to glass. 21 136 likes. And an 1870 oil painting of a stylishly dressed woman peering into the ruins at Pompeii — 19th-century fascination with the rediscovered Roman city. 22 118 likes.

Sam Altman (@sama) posted the day's highest-engagement tweet at 4am — about fatherhood: "being a dad is the thing that has most exceeded already-high-expectations in my whole life." 23 6,298 likes, ~1,000 replies. The gap between that and the Codex announcement (4,347 likes) is a useful reminder of what the platform optimizes for.

宝玉 (@dotey) added a WeChat group-chat summarizer to the open-source baoyu-skills repo, built on wx-cli. Best results with Claude Code + Claude Opus 4.6. 24 240 likes, 398 bookmarks.

Paul the Elite (@elitethedev) shipped a smart logo-matching update for an iOS app organization tool, with a video demo. 25 233 likes. No further detail in the tweet text.

Mateusz Mirkowski (@llmdevguy) posted a one-month review of OpenCode GO, a coding subscription he rates as the best-value option on the market at $5 for the first month and $10/month after. 26 The single drawback: the monthly cap is only slightly above the weekly cap, meaning heavy users hit it fast — he burned 10% of his monthly allowance in a single 5-hour session. 271 likes.