Aug 18, 2026 / Headless Commerce
SMS is the highest intent channel a store owns, and it is also the one most quietly broken by going headless. Every one of these platforms was built assuming the Shopify theme is the storefront: the subscriber capture is a theme app embed, the popup is injected into Liquid, the browse and cart events that trigger automations come from the native online store. Decouple the frontend onto Hydrogen or a custom Next.js build and all of that scaffolding is gone, and the platform that looked identical to its competitors in the app store now behaves completely differently depending on how it captures subscribers and where it gets its event data. Postscript, Attentive, and SMSBump are the three serious choices for a Shopify Plus store, and on the marketing site they look interchangeable: two way SMS, automation flows, revenue attribution, compliance tooling. The differences that decide the project are underneath, in whether the popup and event tracking work at all on a headless frontend, who owns compliance liability, and what the pricing does once your list is large and your send volume is real. This is a decision that outlives the storefront, so it is worth making on the mechanics rather than the feature grid.
Aug 18, 2026 / AI Infrastructure
You set temperature to zero, you pin the seed, you send the exact same prompt twice, and the local model hands you two different answers. Not wildly different, usually, but different enough that a snapshot test fails, a cache key misses, or a regression suite goes red on a change that touched nothing. The instinct is to blame sampling, so people reach for the seed and the temperature knob first, and those matter, but they are only half the story and often not the half that is biting. The deeper source is numerical: the order in which floating point additions happen inside a reduction is not fixed, and it shifts with batch size, with how many requests share the same forward pass, and with which kernel the runtime picked for the shape it saw. Change any of those and the low order bits of a logit change, and once two candidate tokens are close enough, a different one wins and the whole rest of the generation diverges. This post separates the two kinds of nondeterminism, shows which ones you can actually eliminate on an M5 Max and which ones you can only bound, and gives you a configuration that gets a local stack as close to reproducible as the hardware allows.
Aug 18, 2026 / AI Infrastructure
A local language model produces a fluent wrong answer and a fluent right answer with exactly the same confident tone, and nothing in the text itself tells you which one you are looking at. That is the problem every application built on a local model eventually runs into: the output reads well whether or not it is true, and you have no free signal for when to trust it, when to escalate to a larger model, and when to abstain entirely. The signal you are looking for is already being computed on every single token. When the model samples a token it first produces a probability distribution over the whole vocabulary, and the log probability of the token it actually picked is a direct readout of how certain the model was at that step. Aggregate those per token logprobs across a generation and you get a cheap, immediate uncertainty estimate that costs nothing extra to produce because the forward pass already computed it. The catch is that the raw number is easy to misread, and the obvious way to use it, average the logprobs and threshold, is not the feature that best tracks whether the answer is correct. This post measures the logprob based confidence signals on an M5 Max, shows which ones actually separate right answers from wrong ones, and gives you the extraction loop and the abstention gate that turns a fluent guess into an honest one.
Aug 18, 2026 / Headless Commerce
Marketing attribution was already hard before the storefront went headless, and decoupling the front end makes the ground shift under every tool built to measure it. The classic attribution platform assumes a browser it can instrument with a pixel, a checkout it can watch, and a clean chain of client side events from first ad click to purchase. A headless build breaks all three assumptions at once. The storefront is a custom front end the vendor's snippet was never designed for, checkout may live in a separate system, and the events that matter increasingly fire server side where a browser pixel cannot see them. On top of that architectural break sits the industry wide erosion of client side tracking, so the pixel that attribution depends on is losing coverage everywhere, not just on headless stacks. The result is that choosing an attribution platform for a headless Shopify Plus store is not a question of which dashboard looks best. It is a question of which measurement methodology degrades most gracefully when the pixel goes half blind, and which tool can ingest the server side truth you already have rather than depending on the client side signal you are losing. Triple Whale, Northbeam, and Rockerbox answer that from three different methodological starting points, and the wrong pick leaves you optimizing spend against numbers that quietly stopped being real.
Aug 17, 2026 / Payments
Stripe and Braintree both move money reliably, so teams treat the choice as interchangeable. It is not. For AI SaaS companies billing on tokens, seats, and credits, the difference between a gateway and a billing engine decides how fast you can change your pricing.
Aug 16, 2026 / Headless Commerce
Every MACH vendor uses the same four words, API first, cloud native, headless, composable, and the words tell you almost nothing about which one fits your business, because the three leading enterprise engines interpret composable in three genuinely different ways. commercetools gives you the widest commerce domain out of the box, a deep catalog, cart, and order model that you then assemble a frontend and supporting services around. Commerce Layer gives you the thinnest transactional core deliberately, a commerce API designed to bolt onto a content stack you already run, which is either exactly right or exactly wrong depending on whether that stack exists. Elastic Path gives you the heaviest B2B machinery, complex catalogs, account hierarchies, and quoting, aimed at businesses whose commerce is complicated in ways direct to consumer never is. Picking among them is not a feature checklist exercise. It is a question of what shape your commerce actually is, and the wrong answer shows up a year into a build when the platform is fighting the way your business works. This is a comparison of the three by domain scope, integration model, and where each one bills you at scale.
Aug 16, 2026 / AI Models
The context window a model advertises and the context length at which it still answers correctly are two different numbers, and the gap between them is where long context applications quietly fail. A model that claims a million tokens can start dropping answers at 128K on tasks harder than finding a single planted sentence, and the marketing number tells you nothing about where that cliff is. RULER exists to measure the real number. It fills the context with synthetic tasks of controlled difficulty, single needle retrieval, multiple needles, multi hop variable tracing, and aggregation over the whole input, then reports accuracy at each length so you can read off the effective context length, the point past which the model falls below its own short context baseline. We ran Gemini 3.5 Pro and Claude Opus 5 through RULER at lengths up to 128K under one harness, and the interesting result is not the headline retrieval score, which both models pass, but the multi hop and aggregation tasks where the two diverge and where most real long context work actually lives.
Aug 16, 2026 / AI Infrastructure
A local chat assistant that a team actually uses does not reset between messages. It runs for hours, and every turn appends more tokens to the KV cache, which grows without bound until it either exceeds the model's context window or exhausts the unified memory on the machine. At that point you have to throw something away, and the naive choice, drop the oldest tokens and keep the most recent, quietly destroys the model. The reason is a property of transformer attention that most people never see until they hit it: the model leans heavily on the very first tokens of the sequence as anchors, and when those tokens vanish the output degenerates into repetition and nonsense even though the recent context looks fine. This is the attention sink effect, and it is why the correct eviction policy is not a window at all but a window plus a handful of preserved anchor tokens. This post measures the three eviction strategies on an M5 Max running a local chat model, shows where the quality cliff sits, and gives you the eviction loop that keeps a session coherent through hundreds of turns while holding memory and decode speed flat.
Aug 15, 2026 / AI Infrastructure
A single machine serving local inference has one GPU and a queue of requests that all want it. When one of those requests arrives with a very long prompt, the naive scheduler does the obvious thing: it prefills that whole prompt in one uninterrupted pass, because prefill is the most efficient work the GPU can do. The problem is that everyone else waits. A ten thousand token prefill can take several seconds on an M5 Max, and during those seconds every other request that was happily streaming tokens goes silent, because the GPU is busy reading someone else's prompt. Users experience this as a stall that has nothing to do with their own request. Chunked prefill is the scheduler technique that fixes it: instead of prefilling the long prompt in one block, you break it into chunks and interleave those chunks with the decode steps of the requests already in flight. Nobody's stream freezes, but the long prompt now takes slightly longer to produce its first token because its prefill is spread out. This post measures that trade on an M5 Max, shows where the chunk size knob sits, and explains why the right setting depends entirely on whether you are optimizing for one user or many.
Aug 15, 2026 / AI Models
Most vision benchmarks test whether a model can describe an image, which is the easy half of the problem and rarely the half that matters at work. MMMU tests something harder: whether a model can solve a college level question where the image is the problem, not an illustration of it. The figure might be a circuit diagram you have to trace, a chart whose axes carry the answer, a chemical structure, a medical scan, or a geometry construction, and getting the reasoning right depends entirely on reading the visual correctly first. That is why MMMU is a better predictor of whether a model can do real multimodal work than a captioning score, where a model can sound fluent about an image it only half understood. We ran Gemini 3.5 Pro and Claude Opus 5 across the MMMU disciplines under the same harness, measuring overall accuracy and, more usefully, where each model's errors come from: misreading the image versus reasoning wrongly from an image it read correctly. Those two failure types call for different fixes, and the model that wins on the headline number is not always the one that fails more safely on the questions you care about.
Aug 15, 2026 / Headless Commerce
Picking a helpdesk looks like a support team decision and turns into an architecture decision the moment your storefront goes headless. In a standard Shopify theme the helpdesk apps assume the storefront and the order data live in the same place, and the deep integrations that put a customer's order history in the agent's sidebar mostly just work. Decouple the front end, split order state across Shopify and an OMS, push financial truth into NetSuite or QuickBooks, and that convenient assumption breaks. Now the question is not which helpdesk has the nicest inbox; it is which one can assemble a coherent view of a customer whose data is scattered across four systems, and which one lets an agent take an action, refund, cancel, edit, that actually writes back to the system of record rather than to a copy that drifts. Gorgias, Zendesk, and Kustomer answer that question from three different starting philosophies, and the wrong pick shows up not in the demo but a year in, when agents are alt tabbing between six tabs because the sidebar only ever showed half the truth. This is a comparison of how each platform models the customer and the order when the commerce stack underneath it is decoupled.
Aug 15, 2026 / AI Models
The original MMLU stopped being a useful benchmark once frontier models pushed past ninety percent, because at that point the remaining gap is noise and the four answer choices mean a blind guess is right a quarter of the time. MMLU-Pro was built to fix both problems: it expands each question to ten answer choices instead of four, which cuts the value of a lucky guess, and it deliberately adds harder distractors, the wrong answers that look right until you actually work the problem. That combination turns a knowledge quiz into a reasoning test, because a model can no longer coast on recognizing the topic; it has to reason its way past a plausible trap. We ran Grok 4.5 and Gemini 3.5 Pro across the MMLU-Pro disciplines under the same harness and the same prompt, measuring overall accuracy and, more usefully, where each model's errors come from and which disciplines swing the result. The headline gap is small. The discipline level story is where the two models actually differ, and it tells you which one to trust for the kind of reasoning your work depends on.