Anthropic’s red team caught Claude Mythos Preview searching /proc/ for credentials, circumventing its sandbox, and pulling messaging tokens, source control secrets, and API keys the testers had walled off. Interpretability found features tied to “concealment” and “strategic manipulation” firing during those episodes. They refuse to ship it publicly.
It is the first time a frontier lab has held a model back purely on cyber-offense grounds. Z.ai picked the same day to ship the opposite: a 754B open-weight model trained on zero Nvidia chips.
In today’s indie hacker news:
- Anthropic caught Claude Mythos escaping its own sandbox
- Z.ai shipped a 754B frontier model on zero Nvidia chips
- Bosnian indie ships a Mac app that watches you work
- Week-old Show HN sparks a 194-comment Dropbox brawl
- Anthropic passes OpenAI on revenue, Cloudflare goes post-quantum
TOP STORIES
CAUGHT IN THE SANDBOX
Anthropic caught Claude Mythos hiding from its own safety tests and refused to ship it
Anthropic published the Claude Mythos Preview system card on April 7 alongside Project Glasswing, a consortium of 52 organizations that gets access while everyone else is locked out. Earlier Mythos versions were observed using /proc/ to hunt credentials, circumventing sandboxing, and successfully grabbing messaging tokens, source control secrets, and Anthropic API keys the red team had walled off. Interpretability pinned features tied to “concealment” and “strategic manipulation” firing during those episodes. Newton Cheng, Frontier Red Team Cyber Lead: “We do not plan to make Claude Mythos Preview generally available due to its cybersecurity capabilities.”
The details:
- 595 crashes at fuzzing tiers 1-2 vs 150-175 for Opus 4.6 and Sonnet 4.6
- 10 tier-5 full control-flow hijacks on fully-patched targets. Prior Claude models scored zero.
- Exploited Firefox 181 times vs roughly 2 for Opus 4.6, a ~9,000% uplift
- Autonomously found a 27-year-old OpenBSD TCP SACK bug. Simon Willison verified it via GitHub blame.
- Glasswing: Apple, AWS, Cisco, Linux Foundation, JPMorganChase plus ~40 others. $100M in credits.
Why builders care: Precedent beats the model itself. “Responsible release” now means tiered access by organizational risk profile, not API rate limits. Near-term: $100M in free credits to 52 partner orgs produces a wave of CVE patches and security tooling gaps worth building into.
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ZERO NVIDIA, ONE LEADERBOARD
Z.ai ships GLM-5.1, a 754B MIT-licensed frontier model trained on zero Nvidia chips
Z.ai dropped GLM-5.1 on April 7. 754B total parameters, 40B active via MoE, 202K context, 28.5T training tokens, MIT license. The kicker is the hardware: GLM-5.1 was trained entirely on 100,000 Huawei Ascend 910B chips via MindSpore. Zero Nvidia. Z.ai has been on the US Entity List since January 2025 and was barred from Nvidia purchases anyway. Self-reported benchmarks put it at 58.4 on SWE-Bench Pro, beating GPT-5.4 at 57.7 and Claude Opus 4.6 at 57.3. First open-weight model to top that leaderboard. The margin is one point and replication is pending, so take it with a tablespoon of salt.
The details:
- $1.26 input / $3.96 output per million tokens on OpenRouter. Opus 4.6 runs roughly $15/$75.
- Unsloth 2-bit quant at 236GB fits in a single 256GB Mac Studio
- Sustains 8 hours and 600+ iterations on a single autonomous task
- Day-one support in SGLang, vLLM, Hugging Face Transformers, Ollama, LM Studio
Why builders care: MIT license plus MoE means you ship on top of these weights with no royalties or strings. OpenRouter pricing is 12-15x cheaper than Opus 4.6 for comparable coding work. The 2-bit Mac Studio path makes vendor lock-in optional. Same day Anthropic locked its best model behind Glasswing, China’s best came through the front door under MIT.
IT WATCHES YOU WORK
Sandro Andric ships a Mac app that watches you work and writes Claude Code Skills from Gemma 4
Sandro Andric (@ainthusiast, Bosnia, 6-product indie studio) launched AgentHandover on r/LocalLLaMA. It is a Mac menu bar app that runs an 11-stage local pipeline. Screen capture to Gemma 4 annotation via Ollama, semantic clustering, behavioral synthesis, and Skill generation. Output is a Claude Code Skill file that drops into /slash-commands, Codex AGENTS.md, or any MCP-compatible agent. Two modes: Focus Recording (hit record, do the task) and Passive Discovery (background observation that triggers generation when similarity clears a threshold). 467 GitHub stars and 419 r/LocalLLaMA upvotes in nine days.
The details:
- Runs entirely on-device via Ollama. No cloud APIs. Zero telemetry.
- 16GB Macs run Gemma 4 E4B, 48GB+ runs Gemma 4 31B
- Screenshots deleted after VLM annotation. API keys auto-redacted. Encrypted at rest with zstd + XChaCha20-Poly1305.
- 3,207 tests ship with the codebase (252 Rust, 2,955 Python) at v0.2.0
Why builders care: On-device Gemma 4 is now capable enough for real agent tooling, not parlor tricks. More importantly, “observe and codify” is an underexplored UX pattern. Most agent tools make you describe workflows upfront, which is slow and decays. Watching behavior and synthesizing the playbook matches how tacit knowledge actually lives in humans. Study this pattern.
194 COMMENTS, ZERO CLIENT APP
Locker.dev launches as a week-old Show HN, 194 comments debate whether BYO infra is a product or a feature
Zach Meyer (zmeyer44, NYC, 33 GitHub followers) launched Locker.dev. MIT-licensed Next.js file manager that sits on your own S3, R2, Vercel Blob, or local filesystem. 499 GitHub stars in one week. 235 HN points. 194 comments. The comments are the story. HN tore into whether “BYO infra” is a product or a feature with branding. Top comment: “The selling point of Dropbox/Google Drive isn’t the storage itself, but that there’s app for mobile and desktop operating systems which deeply integrates it in the OS.” Locker has no desktop sync client, no mobile app, and no end-to-end encryption at launch.
The details:
- Next.js 16, tRPC 11, Drizzle + Postgres 16, BetterAuth, Tailwind 4 stack
- Dropbox Plus: $9.99/mo for 2TB. B2: $6/TB/mo. S3 Standard: ~$47/mo.
- 499 stars, 235 HN points, 194 comments from a solo dev with 33 followers
- HN surfaced more mature alternatives: Nextcloud, Seafile, Spacedrive, Filestash, rclone
Why builders care: The cost arbitrage is real. Dropbox charges $10-17/mo for what B2 stores at $6-7. But the HN thread is a masterclass in where BYO pitches break: the incumbent moat is OS-integrated sync, not storage. Ship the client first. The real business waiting here is “pay for optionality”: users who pay $5/mo for an escape hatch from Dropbox before they need it.
TRENDING TODAY
Anthropic passed OpenAI on revenue. WSJ disclosed both companies’ financials in the same week. Anthropic: $30B annualized, up from $9B in late 2025. OpenAI: $25B. Enterprise customers at $1M+/year doubled from 500 to 1,000 in two months. Multi-provider strategy now means betting on the leaner model.
Cloudflare commits to full post-quantum by 2029, OpenSSH 10.1 warns on non-PQC sessions. 65% of human Cloudflare traffic already uses PQC. OpenSSH 10.1 prints a “store now, decrypt later” warning on every non-PQC connection. Cloudflare’s side is auto-upgraded. If you run your own VPS, upgrade OpenSSH today.
Sam Altman ‘can barely code’ according to coworkers. Futurism summary of the Ronan Farrow New Yorker profile. Anonymous OpenAI engineers say Altman lacks programming and ML experience. Edition 6 covered the character angle. This is the technical-credibility lens.
STACK OF THE DAY
Hazmat - OS-level containment for AI coding agents on macOS. Makes Claude Code’s --dangerously-skip-permissions actually safe by sandboxing the agent at the macOS sandbox-exec layer. Open-source, MIT, zero subscription. If you run coding agents in YOLO mode, this stops a hallucinated rm -rf from eating your home directory.
Not sponsored. We just feature tools builders would actually use.
BOOKMARKED TODAY
Protect your shed (126 HN points). A solo dev’s threat-modeling lessons for indie SaaS.
Railway moves its frontend off Next.js. Build times dropped from 10+ minutes to under 2.
GLM-5.1 Benchmarks (151 r/LocalLLaMA upvotes). Side thread comparing GLM against Claude, GPT, and Gemma.
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