AI Weekly Malaysia

PostHog published Jeeves, an open-source reasoning classifier built on Qwen3.5-9B with LoRA plus a pointer head, trained with SFT and CISPO, and shipped with full training code and train/dev/test data. It reports 0.889 accuracy on held-out out-of-domain test data (vs Kev-9B 0.822 and Jev 0.857) and 0.935 on JevBench's 231 public items (vs Jev 0.866), using a block-4 diffusion drafter and a Jev-compatible API supporting noul/choice/score questions. Latency is about 0.3 s per request without thinking and a 3.3 s median with thinking on a single H100 at --precision fp8; it runs on CUDA bf16, FP8 on compute capability 8.9+, and Apple Silicon MPS. The thread drew 239 points and 93 comments on Hacker News.

Why: The headline numbers hide a regression: Jeeves scores 0.746 on Transfer (MMLU-Pro and buried state) versus Jev's 0.800, and 0.793 on MMLU versus Jev's 0.900, so reasoning-before-deciding helps on the benchmarks it targets and hurts on general transfer tasks. If you currently fall back to a reasoning model when a Jev-like classifier is uncertain, the 3.3 s median thinking latency versus 0.3 s without means that fallback costs roughly an order of magnitude more wall-clock per request on one H100 at fp8 — decide per pipeline whether you truncate the chain, or keep the calibrated classifier and only reason on the hard slice. Because inference also runs on Apple Silicon in bf16 or FP8, you can benchmark it on a local Mac before paying for cloud GPU time.

Tom's Hardware reports that a $5,245 prebuilt PC with an RTX 5090 had its power connectors melt after the machine sat boxed for a year, with both Digital Storm (the system builder) and PNY (the card vendor) denying warranty claims. The stated reasons for denial were expired coverage and the presence of third-party cables. The article body available here is almost entirely site navigation and subscription boilerplate, so the headline is the only substantive detail — no dates, cable models, photos, or vendor statements are included in the supplied text.

Why: If you buy a prebuilt GPU box for local model inference or rendering, this is a concrete reminder that the warranty clock starts at purchase, not at first power-on — a machine left boxed for a year can burn its coverage before it ever runs. It also means the cable you plug in matters: swapping in a third-party 12VHPWR/12V-2x6 cable gives the vendor a stated reason to deny a melted-connector claim, so unbox, inspect, and test the system with the supplied cable during the coverage window rather than shelving it.

Tom's Hardware is flagging a $520 discount on the MSI Stealth A18 AI+ gaming laptop, configured with an RTX 5090 GPU, 64GB DDR5, a 2TB SSD, a 12-core AMD Ryzen AI 9 CPU, and an 18-inch UHD+ 120Hz display. The article body is almost entirely paywall, newsletter, and membership boilerplate — the actual sale price, retailer, and expiry date are not present in the supplied text.

Why: This is a consumer deal post, not a product change, so nobody's build pipeline or tooling decision changes because of it. The only decision it supports is a hardware purchase, and the text withholds the one number you'd need to make it: the final price after the $520 cut. If you're weighing a 64GB/RTX 5090 laptop as a local inference or fine-tuning box, you'd have to check the retailer page yourself — nothing here lets you compare it against cloud GPU spend.