TL;DR: We pitted Anthropic's two flagship models against each other on a sliding scale of normie tasks—forms, spreadsheets, trip planning, research. Claude Sonnet 4.6 isn’t better than the premium Opus 4.6 model—but it is cheaper and more than good enough for most. Opus still wins when precision, judgment, or careful planning matters.

Some background: AI model updates aren't just about raw capabilities anymore—they’re about value for money. Case in point: Anthropic's Sonnet 4.6, released last Tuesday, claims to deliver near-Opus performance at a fraction of the cost. That matters, because the latest Opus costs more per token—the unit AI models use to measure and process text—so even users on Anthropic's Max plan burn through their limits quickly. (For every three Opus queries, you can do about five with Sonnet for the same price.) Here’s how they stacked up in our testing:

Clear Sonnet wins:

• Filling out a multipage auto insurance quote form. I told it to make up placeholder info to get an online quote from Progressive. Sonnet was a few minutes faster; Opus seemed to get tripped up by the birth date field.
• Finding current news on X. Both finished in roughly the same amount of time, but Sonnet surfaced actually recent news, while Opus brought up topics from as far back as January 2025.

Clear Opus wins:

• Vibe coding apps. I wanted to make a tool that autorenames my screenshots based on what’s in the image. Sonnet asked questions, but delivered an app that didn’t work. Opus caught bugs and gave me a working tool on the first try.
• Processing massive docs. Sonnet handled a single PDF without issue, but froze when asked to download all of the Mag 7's annual reports at once. Opus did it in about five minutes—and it actually grabbed PDFs; Sonnet got HTM files. (Once the files were in hand, both did a comparable job on the analysis itself.)
• Philosophy, ethics, and history questions. Opus took clearer positions and followed instructions more precisely. When asked what the first printed book was, Opus said the Diamond Sutra. Sonnet led with the Gutenberg Bible, then added caveats on “movable type” before landing on the correct answer.

Toss-ups (where you’re probably fine to use Sonnet):

• Spreadsheet analysis. Opus was faster because it clarified how much detail I wanted first; Sonnet asked no questions, but because it pulled a broader data set, analysis ended up being more detailed and interesting.
• Creating custom Skills. I asked them to make a Cowork Skill to log how long each prompt and response took within a task. Both got the job done; Opus's formatting was slightly neater.
• Group trip itinerary. Sonnet’s output involved more color and a peppering of cringe emojis. Opus avoided an incorrect assumption from a screenshot I provided. Both included roughly the same info and activity recs.

The verdict: Think of Sonnet as the Goldilocks option of the Claude family, sitting between Haiku—the cheapest model—and Opus. Opus is more meticulous, self-aware, and reliable, but that level of precision is expensive and, for most tasks, unnecessary. Only upgrade when: You can’t afford silent errors, you’re handling complex code or multidocument reasoning, or you want the model to challenge your assumptions.

What’s next: Frontier labs used to compete on pure intelligence. Now they’re competing on value per token. Sonnet doesn’t dethrone Opus—but it doesn’t need to. It’s “good enough” at a price that makes it the practical default. In that sense, the future of AI may not belong to the smartest model. It may belong to the one that delivers 90% of the performance at 60% of the cost. —WK

The fastest way to find anything on Windows

If your group chat isn’t talking about how much Windows Search sucks, what are you even doing? By default, it searches both your files and the web, and turning off web results requires a registry tweak. Even when limited to local files, it can be slow and doesn’t handle case sensitivity or diacritics well.

A cult-favorite workaround is the Everything Search Tool, a free program for Windows that focuses on file names for efficiency. Its main draw is speed: It indexes all the file names on your computer and spits them out almost instantly. It also supports built-in options that Windows Search lacks, such as case-sensitive matching and diacritics, as well as all the ones that Windows Search does include. Resource use is modest, too (on a system with about 1 million files, it uses around 75MB of RAM), and caches stay local. It’s beloved by Windows power users, who say it has “spoiled” them and saved “hours and hours over the years.”

Though, like your coworker who had three martinis at the holiday party, Windows Search has its limits: It doesn’t search inside files by default, which is partly why it’s so fast. And if you install it with administrator privileges, it can index an entire system—which means on shared machines, users might see file names from folders they wouldn’t normally browse.

Getting started takes two minutes. Download Everything from the developer’s site. Run the installer, and let it build its index, which usually finishes in seconds. After that, you just open it and start typing. You can also set it to launch at startup or assign a keyboard shortcut so it pops up instantly. From there, type part of a file name. Use filters like *.ini or *.pdf to narrow results, and refine further if needed. —WK

We’ve already strapped sensors to our heads, chests, wrists, and fingers to track every health metric imaginable. It was only a matter of time before wearables headed for the literal exit: your behind. Researchers at the University of Maryland have built a "Fitbit for farts," a small hydrogen-sensing device that clips into your underwear and logs every posterior dispatch around the clock. According to the Wall Street Journal, the sensor runs on a newer, cheaper kind of miniature chip found in smart rings and earbuds.

The device is the centerpiece of the Human Flatus Atlas—a real study, not a newly discovered Jonathan Swift satire. The early findings are already filling knowledge gaps on human flatulence (and make for great conversation starters with your 13-year-old nephew): Healthy adults average 32 farts a day, roughly double what medical literature previously estimated. One especially committed participant clocked 175 in the same 24 hours, while one of the least gassy subjects only managed four.

Before sending the sensor into the field, the team needed a reliable way to test it, so they constructed an “artificial butt” that could produce synthetic flatulence on command. One hitch: Real farts contain about 20% hydrogen, which is technically an illegal concentration for a university lab, so they had to make do with a gentler mix.

If you're already reaching for your unmentionables, hold your garters—it's still a prototype. But close to 4,000 people have applied to try it. That enthusiasm makes sense: Some studies estimate that roughly 60 million Americans are affected by digestive issues and disease, and researchers still lack a basic baseline for what “normal” flatulence looks like. By pairing continuous hydrogen tracking with other data, the Human Flatus Atlas could offer a new window into gut health—and potentially reshape how doctors approach bloating, diet intolerance, and GI disease. The top 3% of participants will receive a plaque declaring them “Prodigious Hydrogen Producers.” Though, it’s up to you if you want to put that on LinkedIn. —WK

Chaos Brewing Meter: /5