AI Express // Latest edition // nr. 04 // Sep 17

The Build: Rust on the GPU, a security-audit skill, and Factory's $5B round

Sep 17free stories unlockedfull issue for subscribers

Thursday build. This week the toolchain itself moved: NVIDIA shipped native Rust on the GPU, Cloudflare open-sourced the security-audit skill behind its vulnerability harness, and a solo builder taught a 4B model to out-plan Postgres. Here is what is worth your time.

For Builders

A 4B model beat Postgres on join-heavy queries after agentic RL

Rohan Bansal post-trained a 4B Qwen distill to emit pg_hint_plan hints, then trained it with a custom GRPO variant against live Postgres timings. Result: a 44.7% latency reduction across 113 join-heavy JOB queries, up from a base model that could not produce a plan for 99 of them. The write-up is as much about measurement as modelling: he built a four-container rig to kill page-cache noise, then quantified how often the reward signal fools itself, with a no-op candidate scored as a win up to 40% of the time. If you post-train on a noisy metric, read the calibration sections first.

source: Rohan Bansal - Sep 16

Open-Source Pick

Cloudflare's security-audit-skill turns your coding agent into an auditor

Cloudflare open-sourced the skill that seeded its fleet-wide vulnerability harness. It runs a six-phase audit: reconnaissance into a coverage ledger, coverage-led hunting by isolated agents, adversarial candidate validation where the agent that checks a finding is never the one that found it, structured findings validated against a schema, independent record verification, and target-neutral reports. Two zero-dependency Node validators keep the ledgers honest. Around 9.5k stars, MIT licensed.

source: GitHub - Cloudflare

For subscribers only

Dev Tools

NVIDIA brings GPU kernels to Rust, on two tracks

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Dev Tools

OpenSpec puts a spec in front of your AI agent

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Startup Spotlight

Factory triples its valuation to $5B on autonomous coding agents

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Design & Trends

QuiverAI bets the editable SVG is AI design's real output

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From the Lab

Ternary LLMs waste bits on zeros, and BITCOS packs them tighter

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From the Lab

Google makes design direction an explicit choice for UI agents

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Try This

Fine-tune a 459M NER model for about $9

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Hardware & Edge

Serving a 35B MoE from SSD, and Edge0's preview model

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