Duplibot
বাংলা Start free
AI models

Claude Haiku, Sonnet and Opus: which one should you use?

Every model can answer most questions. They differ in speed, depth and price. Use the smallest one that does the job well and step up only when you need to.

HaikuQuick questions, translation, summaries, short emails. Fastest and cheapest.
SonnetWriting, coding, analysis and long files. The best value for most work.
OpusHard problems, careful long documents, research and difficult code.

All models compared

Cost per reply is a rough guide for a normal answer of about a page, at the rate of the cheapest paid plan. Long documents, big files and deep thinking cost more.

ModelBest forPlan needed~ Cost per reply
Haiku 4.5 Cheapest
claude-haiku-4-5-20251001		 Quick questions, translation, summaries, short emails, simple code fixes. Free and up ৳0.22
Sonnet 4.6
claude-sonnet-4-6		 Writing reports and letters, coding, data analysis, working with long files. Simple and up ৳0.66
Sonnet 5 Best value
claude-sonnet-5		 Writing reports and letters, coding, data analysis, working with long files. Free and up ৳0.66
Sonnet 5.5 New
claude-sonnet-5-5		 Writing reports and letters, coding, data analysis, working with long files. Simple and up ৳0.66
Opus 4.6
claude-opus-4-6		 Hard problems: complex reasoning, long careful documents, difficult code, research. Simple and up ৳1.10
Opus 4.7
claude-opus-4-7		 Hard problems: complex reasoning, long careful documents, difficult code, research. Simple and up ৳1.10
Opus 4.8
claude-opus-4-8		 Hard problems: complex reasoning, long careful documents, difficult code, research. Simple and up ৳1.10
Opus 5 Top quality
claude-opus-5		 The toughest tasks, when quality matters more than cost. Simple and up ৳1.10
Opus 5.5 Top quality
claude-opus-5-5		 The toughest tasks, when quality matters more than cost. Simple and up ৳0.88

How to choose, in three questions

  1. Is it quick? A fact, a translation, a short email or a summary: use Haiku.
  2. Will you keep it or ship it? A report, an assignment, working code or an analysis: use Sonnet.
  3. Is it genuinely hard? Many steps of reasoning, a long careful document, a tricky bug or research: use Opus.

Not sure? Start with Sonnet. If the answer is not good enough, press regenerate after switching to a bigger model. Your chat keeps its history.

Thinking and effort

Next to the model you can set the effort: Low for quick answers, Medium for most work, and High, Extra or Max for problems that need careful step-by-step thinking. Higher effort gives more thorough answers and uses more of your allowance.

Models change

New Claude models come out regularly. We add them when they are available and update this page. Duplibot is an independent product and is not affiliated with Anthropic, which makes the Claude models.

How many replies does each plan give?

Roughly, for normal replies. Mix and match models freely within your allowance.

Free

Try it out

৳0forever
No card needed
1 credit / month
Start free
  • Up to 2 AI images per day, within your AI allowance
  • ~11 Haiku replies a month
  • Haiku 4.5 model
  • Chat, Work and Code modes
  • Small monthly allowance
  • Model reply estimates share one allowance; they are not separate quotas. Long files, images and research use more.
24-hour access

Pro Trial

কেনার আগে সব মডেল ও workspace mode পরীক্ষা করুন

৳0/ 24 hours
One time per account and network · No VPN or proxy · No card
Start free trial

Create a free account or log in, and use every model for 24 hours. No card needed.

  • Haiku, Sonnet & Opus — all active models
  • 10 total AI replies across Haiku, Sonnet & Opus combined, with at most 5 on any one model. Choose any mix.
  • Maximum 2 shared credits for all AI features, including files, images and Research.
  • Chat, Slides, Design, Research, Cowork & other modes
  • 24 hours or 10 replies, whichever comes first
  • Replies in all modes, Compare, scheduled tasks and prompt improvement count together. Large files, images and research also use your shared credits.
  • Up to 3 AI images during the trial. Pro connector and task limits
  • Ends exactly 24 hours after activation, then returns to Free Haiku

Simple

For everyday questions and writing

৳499/ 30 days
or $4 in dollars
68 credits / month
Get Simple
  • Up to 10 AI images per day, within your AI allowance
  • ~756 Haiku replies a month
  • ~756 Sonnet replies a month
  • ~454 Opus replies a month
  • All models: Haiku, Sonnet and Opus
  • Chat, Work, Code, Slides and Design
  • Cowork mode with Python on your files
  • Projects, file uploads, exports
  • Deep Research mode
  • All Duplibot API features included
  • Model reply estimates share one allowance; they are not separate quotas. Long files, images and research use more.
Most popular

Pro

For daily work and research

৳999/ 30 days
or $8 in dollars
150 credits / month
Get Pro
  • Up to 20 AI images per day, within your AI allowance
  • ~1,664 Haiku replies a month
  • ~1,664 Sonnet replies a month
  • ~998 Opus replies a month
  • 2.2x Simple usage
  • Everything in Simple
  • Deep Research mode
  • 3 connectors and 10 scheduled tasks
  • All Duplibot API features included
  • Model reply estimates share one allowance; they are not separate quotas. Long files, images and research use more.

Business

For daily work and research

৳1,999/ 30 days
or $16 in dollars
300 credits / month
Get Business
  • Up to 30 AI images per day, within your AI allowance
  • ~3,331 Haiku replies a month
  • ~3,331 Sonnet replies a month
  • ~1,999 Opus replies a month
  • About 4.4x Simple usage
  • Everything in Pro
  • 6 connectors and 18 scheduled tasks
  • All Duplibot API features included
  • Model reply estimates share one allowance; they are not separate quotas. Long files, images and research use more.

Vast

For heavy use, several hours a day

৳4,999/ 30 days
or $40 in dollars
750 credits / month
Get Vast
  • Up to 40 AI images per day, within your AI allowance
  • ~8,331 Haiku replies a month
  • ~8,331 Sonnet replies a month
  • ~4,999 Opus replies a month
  • About 11x Simple usage
  • Everything in Business
  • 10 connectors and 25 scheduled tasks
  • All Duplibot API features included
  • Model reply estimates share one allowance; they are not separate quotas. Long files, images and research use more.

Developer

For coding agents in VS Code, Cursor and the terminal

৳2,999/ 30 days
or $24 in dollars
450 credits / month
Get Developer
  • Up to 30 AI images per day, within your AI allowance
  • ~5,000 Haiku replies a month
  • ~5,000 Sonnet replies a month
  • ~3,000 Opus replies a month
  • About 6x Simple usage
  • Everything in Business
  • API for Cline, Roo Code and Claude Code
  • Double the API speed limit
  • All Duplibot API features included
  • Model reply estimates share one allowance; they are not separate quotas. Long files, images and research use more.

Learn more: guides on using AI well · all features · FAQ

Start free in under a minute

No card needed. Upgrade only when you need more.

Create free account Compare plans