Ask Claude to "plan my week" with nothing else and you get a tidy, generic plan that fits nobody's week. The model is not the problem. What it was given is. Getting better planning results from Claude Opus and Sonnet comes down to four things: picking the right model for the job, giving it your real schedule instead of a pasted summary, writing short prompts that state the constraint, and checking the plan before anything changes.
This guide covers each one. It works with any Claude plan, and the parts about live data use the Habidu connector, which lets Claude read and change your actual tasks. If you have not set that up yet, the 2-minute setup guide walks through it.
Opus or Sonnet: Which Claude Model Should Plan Your Day?
Anthropic's current lineup includes Claude Opus 5.5 and Claude Sonnet 5.5 (plus Haiku 5.5 for fast, high-volume work and Fable 5.1 for the most demanding reasoning). Anthropic describes Sonnet as "the best combination of speed and intelligence" and Opus as built for long-running, complex knowledge work. Which models you can pick in Claude.ai or the desktop app depends on your plan, so check the model menu.
For planning, a simple rule works well:
- Use Sonnet for everyday planning. "What's on today, where's my free time, add a 30-minute call at 3." These are quick lookups and single changes. A faster model keeps the back-and-forth snappy, and that matters when you are planning in the five minutes before your day starts.
- Use Opus when the planning is genuinely hard. Rebuilding a week around a deadline, juggling an exam schedule with a part-time job, or untangling a backlog of 40 Inbox items into a realistic plan. These involve many constraints at once and several rounds of trade-offs, which is where a more capable model earns its slower pace.
You do not need to overthink this. If a Sonnet answer feels shallow on a complicated week, switch to Opus and ask again in the same chat. If Opus feels slow for "add milk to my Inbox," switch back.
Give Claude Live Data Instead of Pasting Your Schedule
The biggest jump in planning quality is not the model. It is whether Claude can see your real plan.
When you paste a schedule into a chat, three things go wrong:
- It is already out of date. You moved a meeting after you copied it, and Claude plans around the old one.
- It is incomplete. People paste today's list and forget the repeating tasks, the routine that starts at 7, or the five things sitting in their Inbox.
- Nothing changes afterwards. Claude gives you a great plan as text, and then you retype it into your app, which is exactly the step most people skip.
With Habidu connected over MCP (Model Context Protocol, the open standard Claude uses to talk to other apps), Claude reads your schedule at the moment you ask. It can see your tasks and repeating tasks for any day, your Inbox, your routines with their times and steps, and your streak. And when you agree on a plan, it can add, move or delete tasks in Habidu directly, so the plan is the schedule, not a note about it.
The practical difference shows up in prompts. Compare:
- Pasted: "Here's my day: 9 standup, 10-12 report, 2 dentist... where can I fit a workout?"
- Connected: "Where can I fit a 45-minute workout today?"
The second prompt is shorter and more accurate, because Claude looks at the day itself instead of trusting your memory of it.
One privacy note: Habidu does not share your Google Calendar events with Claude through the connector. If something only lives in Google Calendar, mention it in your prompt.
Write Short Prompts That State the Constraint
Long prompts feel thorough, but for planning they often bury the one thing that matters. A good planning prompt usually has three parts: the goal, the constraint, and what you want back.
- "Fit 2 hours of thesis writing into tomorrow, in blocks of no more than 50 minutes. Show me the plan first."
- "I have a low-energy afternoon. Move anything that needs deep focus to tomorrow morning."
- "Look at my Inbox and pick the three items that unblock other people. Don't schedule yet, just list them."
Notice what these leave out: no backstory, no long list of tasks (Claude can read them), no "you are an expert productivity coach." State the rule you care about ("no more than 50 minutes," "not after 8 PM," "keep lunch free") and Claude will plan around it.
Two habits help:
- Name the day. "Tomorrow" is fine, but if you are planning late at night, say "Thursday" so there is no doubt which day you mean.
- Ask for one thing at a time when it matters. "Plan my week" invites a big rewrite. "Plan Monday and Tuesday around the Friday deadline" gets you a plan you can actually check.
If you like to start from a messy list, a brain dump to done works well here: dump everything in one message, then ask Claude to put the timed items on your schedule and the rest in your Inbox.
Use Projects and Custom Instructions for the Rules That Never Change
Some planning rules are true every day: you work 9 to 5, you pray at set times, you never take calls before 10, your focus blocks are 25 minutes, you want lunch kept free. Typing these into every chat is tedious, and forgetting them gives you plans that break your own rules.
Claude has places for that context. A Project in Claude.ai can hold instructions that apply to every chat inside it, and your Claude settings let you add general preferences about how you like to work. A short "Planning" project with a few lines like these goes a long way:
- "My workday is 9:00 to 17:00. Keep 12:30 to 13:15 free for lunch."
- "Focus blocks are 50 minutes with a 10-minute break."
- "Never schedule anything after 21:00."
- "When a change touches more than one task, show me the plan before making it."
Keep it to the rules that genuinely do not change. Anything that changes week to week, like this week's deadline, belongs in the chat itself. And you do not need to put your schedule there, since Claude can read it live through Habidu.
Review the Plan Before It Changes Your Day
A plan that rewrites your afternoon is easy to approve when you can see it and annoying to undo when you cannot. That is why Habidu has a preview step built in.
When a request would change two or more tasks, Habidu does not let Claude go ahead on its own. It sends Claude the list of changes first, with titles and times, and Claude shows you that plan. Only after you say yes does Claude make the changes. A single change, like adding one task, lands right away, because that is easy to see and easy to fix.
You can make this work even better with how you prompt:
- Say "show me the plan first" on anything big, even if it is one change you care about.
- When Claude shows the plan, correct it in plain words: "Yes, but keep the gym block where it is." Claude adjusts before writing anything.
- After the changes land, open the Habidu app. They show up there right away, so a quick look confirms the day looks the way you expected.
Let the Habidu Coach Handle the Coaching
Claude is excellent at the logistics of a plan. Sometimes what you need is the other part: talking through why you keep avoiding a task, or reflecting on a rough day. The connector includes a tool that passes a message to your Habidu coach, and that conversation shows up in your coach chat inside the app. It needs the AI coach turned on in Habidu first.
A useful split: plan in Claude, reflect with the coach. At the end of the week, Claude can also read your real week for a weekly review instead of working from memory.
A Quick Planning Checklist
- Pick Sonnet for quick daily planning, Opus for complicated weeks.
- Connect Habidu so Claude reads your live schedule instead of a pasted copy.
- Write prompts with a goal, a constraint and what you want back.
- Put permanent rules in a Claude Project or your Claude settings.
- Ask to see the plan first, and correct it before it lands.
The Habidu connector works with no limit during your free Habidu trial. After the trial it needs Habidu Premium, which you can also get on the web. New to planning in blocks? The time blocking beginner's guide is a good place to start, and every assistant Habidu works with is listed on the hub page: Use Habidu with your AI assistant.
Frequently Asked Questions
Is Claude Opus or Sonnet better for planning my day?
For everyday planning, like checking your day or adding a task, Sonnet is usually the better fit because it is faster. For complicated planning with many constraints, like rebuilding a week around a deadline, Opus is worth the slower pace. Which models you can choose depends on your Claude plan.
Do I need to paste my schedule into Claude?
Not if you connect Habidu. With the connector, Claude reads your tasks, repeating tasks, Inbox, routines and streak at the moment you ask, so the schedule it plans around is always current.
Can Claude change my Habidu schedule without asking?
A single change, like adding one task, happens right away. Any request that would change two or more tasks shows you the full plan first, and Claude only makes the changes after you say yes.
Where should I put planning rules I always want Claude to follow?
Put permanent rules, like your working hours or focus-block length, in a Claude Project's instructions or your Claude settings. Keep anything that changes from week to week in the chat itself.
Does Claude see my Google Calendar through Habidu?
No. Habidu does not share your Google Calendar events with Claude through the connector. Mention anything that only lives in Google Calendar in your prompt.
What does the Habidu connector cost?
Connecting is free. During your Habidu trial everything works with no limit. After the trial, the connector needs Habidu Premium.
Originally published at https://www.habidu.com/news/claude-opus-sonnet-planning-prompts
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