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Chat model · Anthropic

Claude Haiku 4.5

Included in Pro · came out October 2025

Quick, friendly answers for small everyday jobs

Claude Haiku 4.5 is the fast, light Claude model, made by Anthropic. It suits short messages and quick questions when you like Claude's natural tone but don't want to wait.

Chat with Claude Haiku 4.5

Claude Haiku 4.5 in numbers

What it knows about

Up to February 2025

It learned from information up to February 2025. It can't search the web, so for recent news or prices pick a model that can.

What you can give it

  • Your wordsYes
  • PhotosYes
  • PDFs and filesYes
  • The webNot this one

Real answers

See how Claude Haiku 4.5 answers

We asked it the same everyday questions as every other model in chatmodel, one try each. This is exactly what came back.

My neighbour watered my plants for two weeks while I was away. Write a short, warm thank-you note I can leave with a small gift. Keep it under 80 words.

Thank You Note

Dear [Neighbour's name],

I wanted to thank you for watering my plants while I was away. It was so kind of you to take the time to care for them—they look wonderful! I'm grateful to have such a thoughtful neighbour. Please accept this small gift as a token of my appreciation.

Thank you again for being such a good neighbour.

Warmly, [Your name]

Answered in about 2 seconds · 67 words

Ask it yourself

The Claude family in chatmodel

The newest is Claude Fable 5.1. Ordered by release date.

  1. September 2025Claude Sonnet 4.5
  2. October 2025Claude Haiku 4.5You're here
  3. November 2025Claude Opus 4.5
  4. February 2026Claude Opus 4.6
  5. February 2026Claude Sonnet 4.6
  6. April 2026Claude Opus 4.7
  7. May 2026Claude Opus 4.8

What it's good for

Try it with one of these

Press “Try this” and chatmodel opens with Claude Haiku 4.5 selected and the message already written. Change any word you like.

Write a birthday message

“Write a short birthday message for my brother, who is turning 65. He loves gardening and complains about his knees. Funny but kind, two or three sentences.”

Try this

Fix my spelling

“Correct the spelling and grammar in this message without changing my words or tone too much. Here it is:”

Try this

Read a recipe card

“I'll send a photo of my grandmother's handwritten recipe card. Type it out clearly, and turn any old measurements into grams and milliliters.”

Try this

Sum up a leaflet

“I'll upload a leaflet from my local council. Tell me in three or four lines what it's about and whether I need to do anything.”

Try this

In plain words

Claude Haiku 4.5 is a chat assistant from Anthropic, the company behind Claude. The app describes it as a fast and efficient model. It’s the lightest Claude in chatmodel.

It keeps the warm, natural way of writing that people like about Claude, and it reads photos and documents. It doesn’t stop to think before answering and doesn’t search the web, so it’s best for short, simple jobs.

How to get the most out of it

  1. Keep requests short and clear. One message, one question.
  2. Tell it the tone. “Friendly”, “formal”, “a bit funny”.
  3. Paste your own text when you want it corrected, so it keeps your voice.
  4. Switch to Sonnet if the answer feels rushed or misses something.

How it compares with its siblings

Claude Sonnet 5 is the everyday Claude: it thinks before it answers and can search the web. Older Sonnets, like Claude Sonnet 4.6, also think it through. Claude Opus 5 and the Claude Fable models are more careful still.

When to pick another model

For a quick answer with web search, try GPT 5 mini. For a longer letter, the Help me write tool is a good start. Compare the families in Claude vs Gemini.

Other models worth a look

Claude Sonnet 5

Anthropic

Read the guide

Claude Sonnet 4.6

Anthropic

Read the guide

Claude Opus 5

Anthropic

Read the guide

Frequently asked questions

What's the difference between Haiku, Sonnet and Opus?

They are three sizes of Claude, all made by Anthropic. Haiku is the quickest and lightest, Sonnet is the everyday middle one, and Opus is the most careful.

Does Claude Haiku 4.5 think before answering?

No. It answers straight away, which is why it's quick. For questions that need working out, pick Sonnet or Opus.

Can it search the web?

No. In chatmodel it doesn't search the web, so it only knows what it learned before.

Can it read PDFs and photos?

Yes. It understands photos and can read documents.

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