Anthropic Just Dropped Claude Duet (Full Breakdown)
A walk through Anthropic's launch article for Claude Duet, its always-on personal agent, and how it stacks up against Grok Bot, ChatGPT Dots and Meta Muse.
October 21stA creator speedruns Anthropic's own Opus 5.5 documentation into eight concrete changes, starting with a default effort setting that quietly got lower.
Anthropic's official Opus 5.5 documentation shows the model now defaults to a lower thinking effort than Opus 5, and most of the guide's other seven tips exist to help you stop overriding that default out of old habit.
Anthropic published an official prompting guide for Claude Opus 5.5, and this breakdown distills it into eight concrete changes. The headline shift: Opus 5.5 now defaults to medium thinking effort instead of Opus 5's high, so prompts built for the older model may be spending tokens they no longer need. The rest of the guide covers dropping old 'think carefully' instructions, making Claude check every relevant source before acting, separating pasted content from instructions, and defining what 'done' actually means for an unattended agent. The throughline: default settings changed, and habits tuned for Opus 5 need a deliberate reset, not a blind carryover.
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A cold open frames the video: Anthropic just published an official prompting guide for Opus 5.5, and the host is going to speedrun the 8 key takeaways.

Opus 5 defaulted to high thinking effort; Opus 5.5 now defaults to medium. Anthropic recommends starting at medium and only raising effort once you've measured it helps your specific task, since the same effort label doesn't cost the same thinking across model versions.

Instructions like 'think carefully before answering' may be redundant on Opus 5.5 because effort level already controls how much the model thinks. A vague thinking instruction is less useful than naming the exact comparison and tradeoff you want.

Opus 5.5 gets to work quickly, which can mean it acts before checking other relevant sources, like an email that moved a deadline. Anthropic recommends explicitly telling Claude to look through related documents before acting rather than assuming the first file is complete.

Pasting an email or webpage into a prompt mixes your instruction with someone else's content, which might contain its own embedded instructions. The fix is to state the job first, then paste the source material separately.

A missing progress update usually means the app isn't displaying messages Claude already sent, not that Claude is silent. The better fix is telling Claude exactly when you want an update.

A reply that sounds finished doesn't mean the task is done; a background step can still be running. For unattended agents, defining what 'done' includes lets Claude flag exactly what's still missing.

Opus 5.5 still falls back on generic default website styles unless given concrete visual direction. Naming a specific background, headline style, button shape, and spacing beats a vague note like 'make it less generic.'

Opus 5.5 reads dense visuals and small labels more accurately than Opus 5 and can crop and inspect an image itself when tools are available. Pointing it to the exact detail that matters beats guessing.

A closing recap: pick one tip to try rather than stacking every recommendation into one prompt, since not all of them apply to every workflow.
Anthropic's own Opus 5.5 guide is really a list of assumptions from the Opus 5 era that stopped being true, and the fix in each case is being more explicit, not working harder.
“The same effort level doesn't necessarily mean the same amount of thinking across these models.”
“A longer answer alone doesn't necessarily tell you whether the effort level was worthwhile.”
“When you write out a vague prompt, something like thinking deeply and carefully, it doesn't necessarily tell Claude what makes that answer useful to you.”
“If Claude only reads the brief, it can produce a polished update with the wrong date, obviously.”
“Asking Claude to talk more will not fix updates the app is hiding.”
“Anthropic says less generic often swaps out one default for another.”
“Opus 5.5 reads visual material more accurately than Opus 5 without extra tools.”
See every word as it's spoken — crank it to 2× and still catch all of it. The same dual-channel trick behind Amazon's Kindle + Audible.
Anthropic didn't publicize this one loudly: an official prompting guide for Claude Opus 5.5, complete with a default setting that quietly changed and a line in your system prompt that's probably now wasting tokens. This breakdown speedruns all eight fixes Anthropic recommends, straight from the source document.
A numbered walkthrough of eight changes from Anthropic's official Opus 5.5 prompting guide, mixing quick UX fixes like default effort with detail-level agent instructions like defining 'done'.
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A quick closing line after the recap, not a dedicated pitch segment. No product or paid offer involved.
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08:34Add Modern Creator as a preferred source and Google shows you more of our breakdowns in Search, Top Stories, and AI Overviews. It only changes what you see, and you can undo it in your Google settings anytime.
A walk through Anthropic's launch article for Claude Duet, its always-on personal agent, and how it stacks up against Grok Bot, ChatGPT Dots and Meta Muse.
October 21stA weekly AI news roundup covering two new Claude artifact types, Claude inside Google Workspace, a 90%-cheaper Haiku model, Grok Bot's switch to multi-model routing, and ChatGPT's new interactive UI.
October 9thA screen-recorded walkthrough of Claude's new Docs and Slides outputs, turning one CSV into an editable document and a branded slideshow, then bridging to 9,000+ apps Claude doesn't natively connect to.
September 17thAnthropic merged Claude's memory between chat and Cowork so both remember the same things, but the sync only works if Cowork runs in the cloud, not on your own machine.
August 25thA 15-minute walkthrough of Claude Tag — Anthropic's multiplayer AI teammate built directly into Slack.
June 24thA plain-English walkthrough of Anthropic's most powerful public release — what changed, what's still locked, and what it actually costs.
June 9th