How Anthropic Engineers Actually Use Claude Opus 5.5
A screen-recorded read-through of Anthropic's own prompting playbook for Opus 5.5, tip by tip, with a mid-video pitch for the creator's $9 Claude Code community.
Anthropic's own engineers published a prompting playbook for Opus 5.5 whose core lesson is to stop babysitting the model: hand it a whole task with a clear finish line, delete leftover 'think carefully' instructions, and let a task-list file carry state across a long run instead of the chat scrollback.
Who This Is For
Read if. Skip if.
READ IF YOU ARE…
You run Claude Code on multi-step coding tasks and keep getting interrupted by 'want me to continue?' prompts.
You copied old 'think step by step' prompting habits into your CLAUDE.md files and haven't revisited them since Opus 5.5 shipped.
You want the exact wording for a CLAUDE.md rule that tells Claude when to keep going versus stop and ask.
SKIP IF…
You've already read Anthropic's actual playbook post, since this video is a straight walkthrough of it with little added testing or commentary.
You're not using Claude Code specifically. Some tips, like the effort slider and the task-list-file pattern, are Claude Code features, not general prompting advice.
TL;DR
The full version, fast.
Anthropic's engineers published an official 'Getting the most out of Opus 5.5' playbook, and this video walks through it: give Opus 5.5 the whole task in one message with a stated 'done' condition, delete leftover 'think carefully' lines since the model now reasons before every reply by default, inject follow-up thoughts mid-run instead of waiting for a response to finish, name the design patterns you don't want instead of vague 'avoid generic' instructions, add a short CLAUDE.md rule telling it when to keep going versus stop and ask, hand large audits to subagents, and keep a running task list in a file like TASKS.md so state survives context compaction. The through-line: Opus 5.5 needs less hand-holding, so most of these prompting habits should be removed, not added to.
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Anthropic released an official Opus 5.5 playbook; the creator frames Opus 5.5 as the most powerful current model and promises the full rundown.
00:29 – 01:03
02 · What's different about Opus 5.5
It works longer on its own, states plainly what it did, and thinks before every reply. Introduces the three things to try first.
01:03 – 01:32
03 · Tip 1: hand over the whole task
Give Opus 5.5 the entire task in one message, name what 'done' looks like, and say when it should stop and ask versus keep going.
01:32 – 01:52
04 · Tip 2: delete 'think carefully' lines
Opus 5.5 already reasons before every reply, so old 'think step by step' prompt lines are now just wasted tokens.
01:52 – 02:06
05 · Tip 3: read what it needs first
When a long run ends, read what Claude is asking for before responding. Framed as the core habit for learning to build with Claude.
02:06 – 02:36
06 · Learn Claude Code community pitch
Mid-video plug for the creator's own $9 Skool community ('Learn Claude Code').
02:36 – 04:01
07 · Worked prompt example and the effort slider
A full done-state prompt for migrating payment endpoints, why the 'reason you can't explain' clause matters, and using the Claude Code effort slider instead of think-carefully lines.
04:01 – 04:41
08 · Mid-run input and unwanted design styles
Type a follow-up and hit Enter to inject it into a running task; for design work, name the specific styles you don't want instead of a vague 'avoid generic' instruction.
04:41 – 06:09
09 · Steering a long run with a CLAUDE.md rule
A short CLAUDE.md rule telling Opus 5.5 when to keep going and when to stop and ask, which also fixes repetitive 'want me to continue?' prompts.
06:09 – 06:23
10 · Split work across subagents
For audits, migrations, or large-codebase reviews, explicitly ask Opus 5.5 to split the work across subagents and check each result.
06:23 – 07:21
11 · Keep the task list in a file
Ask Opus 5.5 to keep and update a task list in a file like TASKS.md, and read that file instead of the chat scrollback to see progress.
07:21 – 07:27
12 · Outro
Points to the full playbook link and a follow-up video comparing Opus 5.5 to other models.
Atomic Insights
Lines worth screenshotting.
Opus 5.5 now thinks before every reply by default, so any 'think carefully' or 'think step by step' line in a saved prompt is just burning tokens for nothing.
Removing 'think carefully' lines from prompts made Opus 5.5's replies start sooner with no measurable drop in quality, according to Anthropic's own testing.
The safest way to hand off a long task is to name the finish line explicitly, like 'every endpoint uses the new client and the test suite passes,' not just describe the task.
Telling Opus 5.5 to stop and ask only 'if a test fails for a reason you can't explain' works because the model is now good enough to diagnose and fix most failures itself.
Typing a follow-up message and hitting Enter while Claude is mid-task injects it into the live run, which is cheaper than waiting for the response to finish and re-ingesting full context.
Vague instructions like 'avoid a generic look' just swap one default AI style for another; naming the specific patterns you don't want, like cream backgrounds or pill-shaped buttons, actually works.
A short CLAUDE.md rule telling Opus 5.5 when to keep going versus stop and ask eliminates most of the repetitive 'want me to continue?' prompts.
The recommended stop condition is narrow: continue on anything that doesn't need input, but always stop before deleting data, force-pushing, or touching anything outside the repo.
For large audits or migrations, explicitly asking Opus 5.5 to split the work across subagents lets it coordinate parallel work with comparatively little oversight.
Keeping a running task list in a file like TASKS.md survives context compaction, because a long session eventually gets summarized and loses detail that a file on disk doesn't.
When a long run ends, the first thing to check is whatever Claude is waiting on you to approve or decide, not just the final summary.
Takeaway
How to prompt Opus 5.5 without babysitting it
WHAT TO LEARN
Opus 5.5 reasons and reports on its own, so most of the old prompting habits should be deleted rather than added to, and the real skill is naming a clear finish line and letting it run.
02What's different about Opus 5.5
Opus 5.5 works for longer on its own, states plainly what it did, and thinks before every reply, so it needs less step-by-step prompting than earlier models.
The three habits worth adopting first are handing over the whole task, deleting 'think carefully' lines, and reading what Claude needs once a long run ends.
03Tip 1: hand over the whole task
Give Opus 5.5 the entire task in one message instead of feeding it piecemeal instructions, and name the finish line explicitly, like 'every endpoint uses the new client and tests pass.'
State up front when you want it to stop and ask versus keep working, then let it run instead of checking in constantly.
04Tip 2: delete 'think carefully' lines
Opus 5.5 already reasons before every reply, so 'think carefully' or 'think step by step' lines left over from older prompts just add unnecessary tokens.
Anthropic's own testing found removing those lines made replies start sooner with no measurable drop in quality.
If you want a quick answer to something simple, just say 'answer directly' instead of leaving reasoning instructions in the prompt.
05Tip 3: read what it needs first
When a long run ends, read what Claude is asking for or waiting on before responding, rather than skimming the summary and moving on.
This reading habit is presented as the actual way people learn to build with Claude, not an optional step.
07Worked prompt example and the effort slider
A complete done-state prompt names the task, the finish line, and one exception for stopping, e.g., 'stop and ask only if a test fails for a reason you can't explain.'
That 'reason you can't explain' clause matters because Opus 5.5 is now good enough to diagnose and fix most of its own failing tests without being asked.
To control how much a response reasons without writing a prompt line for it, use the effort slider in Claude Code instead.
08Mid-run input and unwanted design styles
Typing a follow-up and pressing Enter while Claude is still working injects it into the live task, which is cheaper than waiting for the response to finish and re-sending full context.
For design requests, list the specific styles you don't want (cream backgrounds, italic accent words, numbered section labels, pill-shaped buttons) instead of a vague 'avoid generic' instruction.
A generic instruction like 'avoid a generic look' just swaps one default AI style for another; naming actual patterns is what changes the output.
09Steering a long run with a CLAUDE.md rule
Add a short rule to CLAUDE.md that tells Opus 5.5 when to keep going and when to stop and ask, since it otherwise pauses to report progress instead of continuing.
The recommended rule: keep going when a step doesn't need input, put status notes in the same message as the next action, and stop only when you can't continue without the user or before anything destructive like deleting data or force-pushing.
This same rule is what fixes the repetitive 'want me to continue?' prompts that come from not having a stop/go policy defined.
10Split work across subagents
For an audit, migration, or review across a large codebase, explicitly ask Opus 5.5 to split the work across subagents and check each one's result.
Early testers had Opus 5.5 coordinate parallel subagents on long audits and migrations with comparatively little oversight needed.
11Keep the task list in a file
For any run that will take a while, ask Opus 5.5 to keep its task list in a file like TASKS.md and update it as it goes, rather than relying on the chat scrollback.
This matters because a long run eventually fills the context window and gets summarized, which can lose detail that a file on disk survives.
Read the task file, not the conversation history, to see at a glance what's done and what's left.
Glossary
Terms worth knowing.
Effort slider
A Claude Code control that adjusts how much a model reasons before responding, used as the replacement for manually prompting 'think carefully' on Opus 5.5.
CLAUDE.md
A project-level instructions file Claude Code reads automatically, used here to store rules for when the model should keep working versus stop and ask for input.
Subagents
Separate Claude Code work units that can be assigned pieces of a larger task, such as auditing different services in parallel, then report results back for review.
Context compaction
The process where Claude Code summarizes or compresses older parts of a long conversation once it fills the context window, which can lose fine detail that a task-list file preserves.
“Removing any of those think carefully lines made the reply start sooner without a clear drop in quality.”
counterintuitive result stated plainly→ IG reel cold open↗ Tweet quote
04:24
“If you don't give it any direction, it's going to fall back into our generic like AI swap styles.”
names the generic-AI-look problem directly→ TikTok hook↗ Tweet quote
05:43
“Keep going when a step doesn't need my input. Put status notes in the same message as your next action.”
the exact CLAUDE.md rule wording→ newsletter pull-quote↗ Tweet quote
The Script
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The engineers at Anthropic just released the entire playbook for getting the most out of Opus 5 .5 and Cloud Code. If you haven't heard yet, Anthropic just released Cloud Opus 5 .5 and it is the most powerful model on the planet. It is outperforming Fable, it is outperforming GPT -6 Astra, and it is doing it all at a fraction of the cost.
So whether you are brand new to building with Cloud Code and wanna make sure you're using the best practices from the start, or you're someone who's been building for a while, you probably could use a refresh. So this is worth paying attention to.
So this is the whole playbook for getting the most out of Opus 5 .5. So Opus 5 .5 works well with the way you already use Claude, but a few things do behave differently. It works for longer on its own.
It tells you plainly what it did, which is super nice. And it thinks before every reply. So these are the three things to try first when working with Opus 5 .5.
So the first thing to do is to hand over the whole task, say what done looks like, and when you want Claude to stop and ask, then let it go to work. Rather than going back and forth, inserting little messages here and there, give it the entirety of what you want it to do. And then actually instruct Claude, like when it should alert you for user input, or if it should just work continuously.
I actually have a whole video creating these goal style prompts. It does use Fable 5 .1, but many of these same concepts apply. It'll help you structure your task and this idea of what done looks like in a super easy way.
So number two is to delete any think carefully lines because. Opus 5 .5 already thinks before every reply. So you used to prompt these models if you wanted them to go deeper, to think carefully.
And a lot of people who have been building with Claude probably have lines like this already in their ClaudeMD files or their working files. And so these are worth looking at again because it's just adding tokens and adding context that is not necessary anymore. Number three is a step that I think a lot of people skip.
It's when a long run ends, read what it needs from you first. I find that a lot of people skip this reading portion and that's how you learn to build anything with quad is actually by reading and responding. If you are someone who's learning to build, I run one of the top cloud code communities for building websites, apps, games, and more, and turning those builds into revenue.
If you want to join today for only nine bucks, just check the link in the description. So here's how to ask and say what done looks like. So give the whole task in one message, name the finish line, like the test pass when this happens, right?
Or every endpoint is migrated. Then just let Opus 5 .5 cook. So here's an example of how to prompt Opus 5 .5 by giving it a done state and when it needs to act.
ask you for permission. So migrate the payment endpoints from the old client to the new one. Done means every endpoint uses the new client, the old client is deleted, and the test suite passes.
Stop and ask me only if a test fails for a reason you can't explain. So I think this part is key for a reason you can't explain because these models have gotten so good at checking their own work. So it's possible that a test will fail, but Opus will figure out why it fails and then it'll go ahead and fix it.
So like I said, you can stop telling Opus to think hard or think carefully or think step -by -step because it does this automatically. So I think this part is interesting. When the Anthropic team was actually testing this, removing any of those think carefully lines made the reply start sooner without a clear drop in quality.
So if you want a quick answer to a simple question, just say so. So just tell it to answer directly. And as a pro tip, if you want to change how much it actually thinks, like just change the level of effort using the slider.
So the next thing that you can do, and you may already be doing this, is actually adding input to a running task. So sometimes you remember something while Cloud is already doing its thing. You can actually type a follow -up while Cloud is working and just hit Enter, and it will inject that message into the conversation.
This is often better than waiting for Cloud to finish its response before following up, because if you do that, then Cloud is basically ingesting all of the context again, which is just going to increase your tokens and increase your costs. So all you have to do is type the message and press enter while quad is working. So you can just say, hey, like also keep the old endpoints, names and aliases.
So if you are using quad for design work, name the styles you. don't want. So this is kind of a new way of thinking.
So when you ask for a page, an app, or an artifact, list the design habits that you want left out. Don't just give it direction. Tell it exactly what you don't want.
So if you don't give it any direction, it's going to fall back into our generic like AI swap styles. General instruction like avoid a generic look mostly swaps one default for another. So like that just doesn't work.
But listing specific patterns works a whole lot better. So actually like name them. So build a personal website with placeholder content.
don't, use a cream or off -light background, italic accent words and headings, numbered 1, 2, 3 section labels, monospace labels, or pill -shaped buttons. So this is how you can avoid creating these generic AI slop sites. So number two is all about steering a long run in cloud code.
So basically, if you're going to send cloud off to work on something like a long coding session, you can actually put a short rule in your cloud MD file about when to stop and ask and when to keep going. If you don't know how to do this, you can literally just tell Claude, hey, I want to add a rule in my CloudMD file that does this.
So right now, Opus 5 .5 will keep you posted as it works. So on a long task, it will sometimes stop to report instead of just going on. It'll give you like a summary that names the next step, but it won't actually do the next thing.
So basically inserting this rule, it will just tell Claude like, hey, like don't stop to report on these things. Like just keep working until you've hit these checkpoints. So you can tell Claude when to keep going and when to stop and ask.
keep going when a step doesn't need my input. Put status notes in the same message as your next action and then stop and ask only when you can't continue without me or before anything destructive like deleting data, force pushing something or changing anything outside of this repository. So if you keep getting this message where Claude says, want me to continue and you're just constantly saying like, yeah, like keep going, like adding the rule above is gonna help.
So next is specifically ask Claude to split big work across sub -agents. So if you're doing like a big heavy coding task, actually telling Claude specifically, hey, use sub agents for this.
It's actually going to split the task out into these separate little components. It's going to work a lot faster. It's going to save you on tokens and just going to be way more efficient in the long run.
This is actually one of my favorite tips in this whole list is keeping the task list in a file. This is especially important for these bigger coding sessions. So for a run, that's going to take a while, ask Opus 5 .5 to keep its task list in a file and update it as it goes.
So it's actually going to work on a task and check it off the list. But what's cool is it's actually going to read this file, not like its own memory or context window, because what happens is over time, this context window fills up and quad will compact it or compress. it or summarize it.
So basically, it's going to be missing pieces. But if you actually keep like a running list, it's going to survive all of that. And it will show you at a glance what's done and what's left to do.
And again, it makes this task list persist over these longer sessions. So you can actually just say like keep a task list and tasks .md, tick each item when it's done and add anything new you find. If you want to read the rest of the Opus 5 .5 tips from the Anthropic Engineers, I'll leave the link in the description where you can access it for free.
If you want to see why Opus 5 .5 is better than Fable 5 .1 and Aster 6. Just check out this video right here.
I'll see you over there.
The Hook
The bait, then the rug-pull.
Anthropic's own engineers published a prompting playbook for Claude Opus 5.5, and this video is a read-through of it: what to delete from old prompts, what to add to a CLAUDE.md file, and the exact wording that gets a long coding run to finish itself.
Frameworks
Named ideas worth stealing.
00:51list
Three Things to Try First with Opus 5.5
Hand over the whole task and say what done looks like
Delete any 'think carefully' lines
When a long run ends, read what it needs from you first
Anthropic's suggested starting checklist for a first Opus 5.5 session, aimed at people who are still prompting it the way they prompted older models.
Steal forany onboarding doc for a first Claude Code session
03:27model
The Done-State Prompt Formula
Give the whole task in one message
Name the finish line explicitly
State the one exception for stopping and asking
The structure behind the worked 'migrate the payment endpoints' example: task, done condition, and a narrow stop clause.
Steal forany long autonomous coding-agent prompt
05:40concept
The CLAUDE.md Stop/Ask Rule
Keep going when a step doesn't need input
Put status notes in the same message as the next action
Stop and ask only when you can't continue without the user, or before anything destructive
A short rule Anthropic recommends adding to CLAUDE.md so Opus 5.5 stops pausing to report progress and instead keeps working until a real checkpoint.
Steal forany project's CLAUDE.md for long unattended runs
CTA Breakdown
How they asked for the click.
VERBAL ASK
02:06product
“If you want to join today for only nine bucks, just check the link in the description.”
Dropped mid-video between tip 3 and tip 4 as an aside for 'someone who's learning to build,' pointing to his own $9 Skool community rather than anything Anthropic ships.
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