#109

Kimi K3 and Qwen 3.8 close in on Anthropic, and Claude Fable broke the Jacobian conjecture

Kimi K3 and Qwen 3.8 now rank near the top on open weights, while Claude Fable 5 costs nearly 3 times as much per task. Fable broke the Jacobian conjecture.

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Two open Chinese models crashed the frontier in one weekend. Moonshot’s Kimi K3 shipped at 2.8 trillion parameters, the largest open model yet. It ranks third on Artificial Analysis, one slot above Claude Opus 4.8. Alibaba’s Qwen 3.8 landed days later. And Claude Fable 5 still costs nearly 3 times as much per task.

Kimi’s weights go public within the week. Any team will soon self host a top tier model instead of renting one. Anthropic is the most exposed lab, because price is its soft spot, not model quality.

In today’s indie hacker news:

  • 🤖 Kimi K3 and Qwen 3.8 crash the open frontier
  • ➗ Claude Fable broke the 87-year-old Jacobian conjecture
  • 🚔 Flock lied to a city, killed in a day
  • 🫠 A solo dev shipped Jelly UI in five days
  • 🗺️ One known bug froze Romania’s land registry
  • 💵 First paying customers, from race decks to headshots

TOP STORIES

THE FRONTIER JUST WENT DOWNLOADABLE

🤖 Kimi K3 and Qwen 3.8 reach the frontier while Fable 5 keeps a 3x price tag

Two open-source robots climbing toward a premium model on a golden pedestal

The story: Moonshot AI released Kimi K3 on July 16. Alibaba answered three days later with the 2.4 trillion parameter Qwen 3.8. Analyst Nathan Lambert calls K3 the strongest open model ever shipped. The Emerging Trajectories piece that topped Hacker News argues Anthropic’s exposure is price, since the quality gap has mostly closed.

The details:

  • Weights drop July 27. Until then K3 runs through kimi.com and the API.
  • Kimi Code ships too, an open source rival to Claude Code that defaults to Kimi’s own models.
  • Price is the tell. Cached input runs $0.30 per million tokens, and Qwen 3.8 previews at 10% of standard.
  • Anthropic’s math is heavier. Its run rate passed $30 billion, up from $9 billion in late 2025, with over $100 billion pledged to AWS.
  • Reliability keeps slipping. Claude outages took Opus down for hours and blocked Code logins into early 2026.

Why builders care: Near frontier intelligence is turning into something you download, not rent. Treat model choice as swappable infrastructure. Design for the cheaper, ownable option before you bet a product on one vendor.

87 YEARS, GONE IN ONE FORMULA

➗ Claude Fable helped break the 1939 Jacobian conjecture, and you can verify it in 30 seconds

An ancient stone monument cracked down the middle beside a small AI spark

The story: On July 20, mathematician @alpoge posted a degree-7 polynomial map that breaks the Jacobian conjecture, open since 1939. He credits the Anthropic model he calls Fable, which ForkLog reports as Claude Fable 5. Its Jacobian determinant is -2 at every point. Yet three different inputs land on one output, so no inverse exists.

The details:

  • Verifiable, not vibes. A short SymPy script confirms both identities in about 30 seconds.
  • Independent math checks out. David Speyer confirmed the map is generically three-to-one, not bijective.
  • The crowd piled in. The thread hit 711 points on Hacker News, and even Grok verified the counterexample.
  • A known graveyard fell. Mathematician Qiaochu Yuan calls it the most famous open problem an LLM has resolved yet.
  • One caveat. The model credit is self-reported, and no prompt or chat log has been published.

Why builders care: When your model produces something valuable, ship it as a checkable certificate. Do not ask the user to trust an internal claim. That is why this held up where a deleted AI-math benchmark boast did not.

APPROVED AT NIGHT, KILLED BY MORNING

🚔 Flock told a city council its cameras build no heat map, then admitted they do

A vendor contract torn in half over a night city council chamber

The story: At an April meeting in Oshkosh, Wisconsin, Flock’s security chief made a promise. He said its license plate cameras build no heat map of a searched vehicle. The council approved the deal that night. By morning the police chief confirmed the cameras do build heat maps. The council voted 7-0 to rescind, a record one day reversal, per FOX 11.

The details:

  • It was a documented lie. Flock later admitted the heat map shows a vehicle’s captured locations for up to a month.
  • The pattern is federal too. Flock denied federal access, then 404 Media found CBP searching more than 80,000 of its cameras.
  • LAPD walked too. The largest US police department let its Flock contract lapse after an audit flagged 161 wrongly investigated people.
  • The ACLU is done being quiet. A 106-year-old group now tells governments to distrust anything Flock claims.

Why builders care: If you sell to institutions that vote in public and keep records, credibility is the product. One caught misstatement compounds into churn no feature set can outrun.

JIGGLE PHYSICS, FRONT PAGE, INSTANT TEARDOWN

🫠 One engineer and Claude shipped Jelly UI’s 40 components in five days

Glossy jelly-like buttons wobbling on a web page under a magnifying glass

The story: Jelly UI gives native HTML form controls soft-body physics, so every toggle settles with a wobble. Baldvin Mar Smarason built it solo, pairing with Claude as the second committer on the repo. The Show HN hit 400 points, and the top comment was a performance teardown.

The details:

  • The teardown was technical. One commenter flagged a loop repainting the whole document, and another could not reproduce it in Chrome.
  • The native framing got challenged. The controls need JavaScript, so a critic argued they are progressive enhancement, not native.
  • Accessibility bought the launch. It ships WCAG AA tokens, ARIA patterns, keyboard support, and a reduced-motion mode.
  • Then v1.1 answered back. The same-week update stopped buttons firing on release outside the control, echoing a thread complaint.

Why builders care: A distinctive hook plus real accessibility rigor earns the upvotes. The work that follows is answering performance and progressive-enhancement scrutiny fast, and in public, before the thread decides for you.

NO 0DAY, A NATION ON HOLD

🗺️ A known bug, not a 0day, froze Romania’s entire land registry for a week

A dark national records hall as a hooded figure slips through an unlocked side door

The story: A lone operator called ByteToBreach knocked Romania’s national land registry offline from July 14, per Risky Business. Notaries could not close property deals for about a week. He says no 0day was needed, only a simple known vulnerability, and KELA traces him to Oran, Algeria.

The details:

  • The network was ancient. KELA’s leaked map shows Windows XP, Windows 7, and Server 2003 still running inside.
  • One policy said it all. Among 69 Group Policy Objects was one literally named DISABLE WINDOWS FIREWALL.
  • An offline backup saved it. The agency is rebuilding from scratch, and only an offline copy prevented permanent loss.
  • Registries are a target. Poland, Slovakia, Greece, Morocco, Russia, and Ukraine all had registry agencies hit in three years.

Why builders care: The failure was mundane, not exotic. Patch known bugs fast, and segment so one foothold is not the whole network. Keep offline backups you can actually restore from.

🌏 China’s open-weights bet is paying off - The essay argues US AI locked itself down while China ships open. It pulled 1,013 points and 809 comments. The distribution winner is whoever developers can run for free.

🧮 Human mathematicians are being outcounterexampled - A widely read math blog on AI finding counterexamples faster than people. It hit 264 points the same day the Jacobian result landed above.

🏃 Kailo turns your runs into a livestream - Twitch, but for running: stream live from Apple Watch, iOS, or Android. It is early on r/SideProject, but the watch-me-do-the-thing format travels.

FIRST DOLLAR

FIRST CUSTOMER, FIRST BUG REPORT

🐎 HandicapIQ landed its first paying customer and first bug report in one email

It reads a horse racing program, PDF or phone photo, and returns pace, contenders, and a bet or no-play call. The builder got paid and got a bug report in the same message. That is what week one of real usage looks like.

FROM PHOTO STUDIO TO PROMPT

📸 Portraify turns casual photos into headshots and ID photos

The founder needed an urgent ID photo, and the studio run cost about $13. So they built a tool that turns one to three snaps into headshots or passport photos. Likeness was the whole point.

STACK OF THE DAY

📺 Jellyfin

Jellyfin is the free, self-hosted media server, the open-source route to your own Netflix. The news peg: founder Andrew stepped away from the team, a post that drew 143 points on Hacker News. If you self-host, that is the point. You own the software, so a leadership change is a headline, not an outage.

Not sponsored. We just feature tools builders would actually use.

BOOKMARKED TODAY

🐉 Who’s afraid of Chinese models? - Stratechery on why open Chinese weights rattle US labs, the measured counterpoint to today’s lead.

💻 Nativ runs frontier open models on your Mac - Point it at a model and run it locally, no cloud account required. The natural next step if Kimi’s weights tempt you.

💳 First sale, one day after launch - A builder shipped a small SaaS after years of tools just for themselves. Someone bought an annual plan on day one, and they are staying level-headed about a single datapoint.

Curated by AI, built by a human. Know a builder who’d dig this? Forward it their way.